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13 years agosmp_call_function() only lets all other CPUs execute a specific function,
Shaohua Li [Wed, 3 Aug 2011 00:52:56 +0000 (10:52 +1000)]
smp_call_function() only lets all other CPUs execute a specific function,
while we expect all CPUs do in intel_idle.  Without the fix, we could have
one cpu which has auto_demotion enabled or has no boradcast timer setup.
Usually we don't see impact because auto demotion just harms power and the
intel_idle init is called in CPU 0, where boradcast timer delivers
interrupt, but this still could be a problem.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe current implementation of the /dev/hpet driver couples opening the
Magnus Lynch [Wed, 3 Aug 2011 00:52:56 +0000 (10:52 +1000)]
The current implementation of the /dev/hpet driver couples opening the
device with allocating one of the (scarce) timers (aka comparators).  This
is a limitation in that the main counter may be valuable to applications
seeking a high-resolution timer who have no use for the interrupt
generating functionality of the comparators.

This patch alters the open semantics so that when the device is opened, no
timer is allocated.  Operations that depend on a timer being in context
implicitly attempt allocating a timer, to maintain backward compatibility.
 There is also an IOCTL (HPET_ALLOC_TIMER _IO) added so that the
allocation may be done explicitly.  (I prefer the explicit open then
allocate pattern but don't know how practical it would be to require all
existing code to be changed.)

/dev/hpet is accessed via mmap().  This is the only interface of /dev/hpet
that is actually used in practice.

[akpm@linux-foundation.org: coding-style tweaks]
[arnd@arndb.de: fix build]
Signed-off-by: Magnus Lynch <maglyx@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoSigned-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Andy Shevchenko [Wed, 3 Aug 2011 00:52:56 +0000 (10:52 +1000)]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Eric Paris <eparis@parisplace.org>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoRemove PageSwapBacked (!page_is_file_cache) cases from
Hugh Dickins [Wed, 3 Aug 2011 00:52:54 +0000 (10:52 +1000)]
Remove PageSwapBacked (!page_is_file_cache) cases from
add_to_page_cache_locked() and add_to_page_cache_lru(): those pages now go
through shmem_add_to_page_cache().

Remove a comment on maximum tmpfs size from fsstack_copy_inode_size(), and
add a comment on swap entries to invalidate_mapping_pages().

And mincore_page() uses find_get_page() on what might be shmem or a tmpfs
file: allow for a radix_tree_exceptional_entry(), and proceed to
find_get_page() on swapper_space if so (oh, swapper_space needs #ifdef).

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoAfter selecting a task to kill, the oom killer iterates all processes and
David Rientjes [Wed, 3 Aug 2011 00:52:51 +0000 (10:52 +1000)]
After selecting a task to kill, the oom killer iterates all processes and
kills all other threads that share the same mm_struct in different thread
groups.  It would not otherwise be helpful to kill a thread if its memory
would not be subsequently freed.

A kernel thread, however, may assume a user thread's mm by using
use_mm().  This is only temporary and should not result in sending a
SIGKILL to that kthread.

This patch ensures that only user threads and not kthreads are sent a
SIGKILL if they share the same mm_struct as the oom killed task.

Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe tracing ring-buffer used this function briefly, but not anymore.
Johannes Weiner [Wed, 3 Aug 2011 00:52:51 +0000 (10:52 +1000)]
The tracing ring-buffer used this function briefly, but not anymore.
Make it local to the writeback code again.

Also, move the function so that no forward declaration needs to be
reintroduced.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoper-task block plug can reduce block queue lock contention and increase
Shaohua Li [Wed, 3 Aug 2011 00:52:50 +0000 (10:52 +1000)]
per-task block plug can reduce block queue lock contention and increase
request merge.  Currently page reclaim doesn't support it.  I originally
thought page reclaim doesn't need it, because kswapd thread count is
limited and file cache write is done at flusher mostly.

When I test a workload with heavy swap in a 4-node machine, each CPU is
doing direct page reclaim and swap.  This causes block queue lock
contention.  In my test, without below patch, the CPU utilization is about
2% ~ 7%.  With the patch, the CPU utilization is about 1% ~ 3%.  Disk
throughput isn't changed.  This should improve normal kswapd write and
file cache write too (increase request merge for example), but might not
be so obvious as I explain above.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoradix_tree_tag_get()'s BUG (when it sees a tag after saw_unset_tag) was
Hugh Dickins [Wed, 3 Aug 2011 00:52:50 +0000 (10:52 +1000)]
radix_tree_tag_get()'s BUG (when it sees a tag after saw_unset_tag) was
unsafe and removed in 2.6.34, but the pointless saw_unset_tag left behind.

Remove it now, and return 0 as soon as we see unset tag - we already rely
upon the root tag to be correct, returning 0 immediately if it's not set.

Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agounmap_and_move() is one a big messy function. Clean it up.
Minchan Kim [Wed, 3 Aug 2011 00:52:50 +0000 (10:52 +1000)]
unmap_and_move() is one a big messy function.  Clean it up.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoIn __zone_reclaim case, we don't want to shrink mapped page. Nonetheless,
Minchan Kim [Wed, 3 Aug 2011 00:52:49 +0000 (10:52 +1000)]
In __zone_reclaim case, we don't want to shrink mapped page.  Nonetheless,
we have isolated mapped page and re-add it into LRU's head.  It's
unnecessary CPU overhead and makes LRU churning.

Of course, when we isolate the page, the page might be mapped but when we
try to migrate the page, the page would be not mapped.  So it could be
migrated.  But race is rare and although it happens, it's no big deal.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoIn async mode, compaction doesn't migrate dirty or writeback pages. So,
Minchan Kim [Wed, 3 Aug 2011 00:52:49 +0000 (10:52 +1000)]
In async mode, compaction doesn't migrate dirty or writeback pages.  So,
it's meaningless to pick the page and re-add it to lru list.

Of course, when we isolate the page in compaction, the page might be dirty
or writeback but when we try to migrate the page, the page would be not
dirty, writeback.  So it could be migrated.  But it's very unlikely as
isolate and migration cycle is much faster than writeout.

So, this patch helps cpu overhead and prevent unnecessary LRU churning.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoChange ISOLATE_XXX macro with bitwise isolate_mode_t type. Normally,
Minchan Kim [Wed, 3 Aug 2011 00:52:49 +0000 (10:52 +1000)]
Change ISOLATE_XXX macro with bitwise isolate_mode_t type.  Normally,
macro isn't recommended as it's type-unsafe and making debugging harder as
symbol cannot be passed throught to the debugger.

Quote from Johannes
" Hmm, it would probably be cleaner to fully convert the isolation mode
into independent flags.  INACTIVE, ACTIVE, BOTH is currently a
tri-state among flags, which is a bit ugly."

This patch moves isolate mode from swap.h to mmzone.h by memcontrol.h

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoacct_isolated of compaction uses page_lru_base_type which returns only
Minchan Kim [Wed, 3 Aug 2011 00:52:49 +0000 (10:52 +1000)]
acct_isolated of compaction uses page_lru_base_type which returns only
base type of LRU list so it never returns LRU_ACTIVE_ANON or
LRU_ACTIVE_FILE.  In addtion, cc->nr_[anon|file] is used in only
acct_isolated so it doesn't have fields in conpact_control.

This patch removes fields from compact_control and makes clear function of
acct_issolated which counts the number of anon|file pages isolated.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years ago- Add x86_64 specific wire up
Christopher Yeoh [Wed, 3 Aug 2011 00:52:48 +0000 (10:52 +1000)]
- Add x86_64 specific wire up

- Change behaviour so process_vm_readv and process_vm_writev return
  the number of bytes successfully read or written even if an error
  occurs

- Add more kernel doc interface comments

- rename some internal functions (process_vm_rw_check_iovecs,
  process_vm_rw) so they make more sense.

- Add licence message

- Fix kernel-doc comment format

Still need to do benchmarking to see if the optimisation for small copies
using a local on-stack array in process_vm_rw_core is worth it.

Signed-off-by: Chris Yeoh <cyeoh@au1.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe basic idea behind cross memory attach is to allow MPI programs doing
Christopher Yeoh [Wed, 3 Aug 2011 00:52:48 +0000 (10:52 +1000)]
The basic idea behind cross memory attach is to allow MPI programs doing
intra-node communication to do a single copy of the message rather than a
double copy of the message via shared memory.

The following patch attempts to achieve this by allowing a destination
process, given an address and size from a source process, to copy memory
directly from the source process into its own address space via a system
call.  There is also a symmetrical ability to copy from the current
process's address space into a destination process's address space.

- Use of /proc/pid/mem has been considered, but there are issues with
  using it:
  - Does not allow for specifying iovecs for both src and dest, assuming
    preadv or pwritev was implemented either the area read from or
  written to would need to be contiguous.
  - Currently mem_read allows only processes who are currently
  ptrace'ing the target and are still able to ptrace the target to read
  from the target. This check could possibly be moved to the open call,
  but its not clear exactly what race this restriction is stopping
  (reason  appears to have been lost)
  - Having to send the fd of /proc/self/mem via SCM_RIGHTS on unix
  domain socket is a bit ugly from a userspace point of view,
  especially when you may have hundreds if not (eventually) thousands
  of processes  that all need to do this with each other
  - Doesn't allow for some future use of the interface we would like to
  consider adding in the future (see below)
  - Interestingly reading from /proc/pid/mem currently actually
  involves two copies! (But this could be fixed pretty easily)

As mentioned previously use of vmsplice instead was considered, but has
problems.  Since you need the reader and writer working co-operatively if
the pipe is not drained then you block.  Which requires some wrapping to
do non blocking on the send side or polling on the receive.  In all to all
communication it requires ordering otherwise you can deadlock.  And in the
example of many MPI tasks writing to one MPI task vmsplice serialises the
copying.

There are some cases of MPI collectives where even a single copy interface
does not get us the performance gain we could.  For example in an
MPI_Reduce rather than copy the data from the source we would like to
instead use it directly in a mathops (say the reduce is doing a sum) as
this would save us doing a copy.  We don't need to keep a copy of the data
from the source.  I haven't implemented this, but I think this interface
could in the future do all this through the use of the flags - eg could
specify the math operation and type and the kernel rather than just
copying the data would apply the specified operation between the source
and destination and store it in the destination.

Although we don't have a "second user" of the interface (though I've had
some nibbles from people who may be interested in using it for intra
process messaging which is not MPI).  This interface is something which
hardware vendors are already doing for their custom drivers to implement
fast local communication.  And so in addition to this being useful for
OpenMPI it would mean the driver maintainers don't have to fix things up
when the mm changes.

There was some discussion about how much faster a true zero copy would
go. Here's a link back to the email with some testing I did on that:

http://marc.info/?l=linux-mm&m=130105930902915&w=2

There is a basic man page for the proposed interface here:

http://ozlabs.org/~cyeoh/cma/process_vm_readv.txt

This has been implemented for x86 and powerpc, other architecture should
mainly (I think) just need to add syscall numbers for the process_vm_readv
and process_vm_writev. There are 32 bit compatibility versions for
64-bit kernels.

For arch maintainers there are some simple tests to be able to quickly
verify that the syscalls are working correctly here:

http://ozlabs.org/~cyeoh/cma/cma-test-20110718.tgz

Signed-off-by: Chris Yeoh <yeohc@au1.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Howells <dhowells@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: <linux-man@vger.kernel.org>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe address limit is already set in flush_old_exec() so this assignment of
Mathias Krause [Wed, 3 Aug 2011 00:52:47 +0000 (10:52 +1000)]
The address limit is already set in flush_old_exec() so this assignment of
USER_DS is redundant.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: David Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agobrd_make_request() always returns 0, which doesn't make much sense.
Eric Miao [Wed, 3 Aug 2011 00:52:46 +0000 (10:52 +1000)]
brd_make_request() always returns 0, which doesn't make much sense.

Signed-off-by: Eric Miao <eric.miao@linaro.org>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoInstead of open coding this function use kstrtoul_from_user() directly.
Stephen Boyd [Wed, 3 Aug 2011 00:52:46 +0000 (10:52 +1000)]
Instead of open coding this function use kstrtoul_from_user() directly.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Doug Gilbert <dgilbert@interlog.com>
Cc: Douglas Gilbert <dougg@torque.net>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThis does involve additional use of the spin lock in idr.c. Is this an
Jonathan Cameron [Wed, 3 Aug 2011 00:52:45 +0000 (10:52 +1000)]
This does involve additional use of the spin lock in idr.c.  Is this an
issue?

Also, some error mangling was needed to keep the interface the same.  Does
this matter or can we return -ENOSPC instead of -EBUSY?

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <tj@kernel.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Boaz Harrosh <bharrosh@panasas.com>
Cc: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoSome mangling of errors was necessary to maintain current interface.
Jonathan Cameron [Wed, 3 Aug 2011 00:52:45 +0000 (10:52 +1000)]
Some mangling of errors was necessary to maintain current interface.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <tj@kernel.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoWe leak in drivers/scsi/aacraid/commctrl.c::aac_send_raw_srb() :
Jesper Juhl [Wed, 3 Aug 2011 00:52:45 +0000 (10:52 +1000)]
We leak in drivers/scsi/aacraid/commctrl.c::aac_send_raw_srb() :

We allocate memory:
        ...
                        struct user_sgmap* usg;
                        usg = kmalloc(actual_fibsize - sizeof(struct aac_srb)
                          + sizeof(struct sgmap), GFP_KERNEL);
and then neglect to free it:
        ...
                        for (i = 0; i < usg->count; i++) {
                                u64 addr;
                                void* p;
                                if (usg->sg[i].count >
                                    ((dev->adapter_info.options &
                                     AAC_OPT_NEW_COMM) ?
                                      (dev->scsi_host_ptr->max_sectors << 9) :
                                      65536)) {
                                        rcode = -EINVAL;
                                        goto cleanup;
        ... this 'goto' makes 'usg' go out of scope and leak the memory we
            allocated.
            Other exits properly kfree(usg), it's just here it is neglected.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoFix sparse warnings of right shift bigger than source value size:
Randy Dunlap [Wed, 3 Aug 2011 00:52:45 +0000 (10:52 +1000)]
Fix sparse warnings of right shift bigger than source value size:

drivers/scsi/megaraid.c:311:65: warning: right shift by bigger than source value
drivers/scsi/megaraid.c:313:65: warning: right shift by bigger than source value
drivers/scsi/megaraid.c:317:67: warning: right shift by bigger than source value
drivers/scsi/megaraid.c:319:67: warning: right shift by bigger than source value

Patch suggestion from email by Al Viro:

"Since both are claimed to be strings, I really suspect that this >> 8 is
misspelled >> 4 and they have a character followed by pair of two-digit
packed decimals in there..."

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Neela Syam Kolli <megaraidlinux@lsi.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoFor headers that get exported to userland and make use of u32 style
Alexander Shishkin [Wed, 3 Aug 2011 00:52:44 +0000 (10:52 +1000)]
For headers that get exported to userland and make use of u32 style
type names, it is advised to include linux/types.h.

This fixes a headers_check warning.

Signed-off-by: Alexander Shishkin <virtuoso@slind.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe current implementation of dmi_name_in_vendors() is an invitation to
Jean Delvare [Wed, 3 Aug 2011 00:52:44 +0000 (10:52 +1000)]
The current implementation of dmi_name_in_vendors() is an invitation to
lazy coding and false positives [1].  Searching for a string in 8 know
what you're looking for, so you should know where to look.  strstr isn't
fast, especially when it fails, so we should avoid calling it when it just
can't succeed.

Looking at the current users of the function, it seems clear to me that
they are looking for a system or board vendor name, so let's limit
dmi_name_in_vendors to these two DMI fields.  This much better matches the
function name, BTW.

[1] We currently have code looking for short names in DMI data, such
as "IBM", "ASUS" or "Acer". I let you guess what will happen the day
other vendors ship products named, for example, "SCHREIBMEISTER",
"PEGASUS" or "Acerola".

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoWhen do pci remove/rescan on system that have more iommus, got
Yinghai Lu [Wed, 3 Aug 2011 00:52:44 +0000 (10:52 +1000)]
When do pci remove/rescan on system that have more iommus, got

[  894.089745] Set context mapping for c4:00.0
[  894.110890] mpt2sas3: Allocated physical memory: size(4293 kB)
[  894.112556] mpt2sas3: Current Controller Queue Depth(1883), Max Controller Queue Depth(2144)
[  894.127278] mpt2sas3: Scatter Gather Elements per IO(128)
[  894.361295] DRHD: handling fault status reg 2
[  894.364053] DMAR:[DMA Read] Request device [c4:00.0] fault addr fffbe000
[  894.364056] DMAR:[fault reason 02] Present bit in context entry is cl

it turns out when remove/rescan, pci dev will be freed and will get
another new dev.  but drhd units still keep old one...  so
dmar_find_matched_drhd_unit will return wrong drhd and iommu for the
device that is not on first iommu.

So need to update devices in drhd_units during pci remove/rescan.

Could save domain/bus/device/function aside in the list and according that
info restore new dev to drhd_units later.  Then
dmar_find_matched_drdh_unit and device_to_iommu could return right drhd
and iommu.

Add remove_dev_from_drhd/restore_dev_to_drhd functions to do the real
work.  call them in device ADD_DEVICE and UNBOUND_DRIVER

Need to do the samething to atsr.  (expose dmar_atsr_units and add
atsru->segment)

After patch, will right iommu for the new dev and will not get DMAR error
any more.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe address limit is already set in flush_old_exec() so those calls to
Mathias Krause [Wed, 3 Aug 2011 00:52:43 +0000 (10:52 +1000)]
The address limit is already set in flush_old_exec() so those calls to
set_fs(USER_DS) are redundant.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe dqc_bitmap field of struct ocfs2_local_disk_chunk is 32-bit aligned,
Akinobu Mita [Wed, 3 Aug 2011 00:52:43 +0000 (10:52 +1000)]
The dqc_bitmap field of struct ocfs2_local_disk_chunk is 32-bit aligned,
but not 64-bit aligned.  The dqc_bitmap is accessed by ocfs2_set_bit(),
ocfs2_clear_bit(), ocfs2_test_bit(), or ocfs2_find_next_zero_bit().  These
are wrapper macros for ext2_*_bit() which need to take an unsigned long
aligned address (though some architectures are able to handle unaligned
address correctly)

So some 64bit architectures may not be able to access the dqc_bitmap
correctly.

This avoids such unaligned access by using another wrapper functions for
ext2_*_bit().  The code is taken from fs/ext4/mballoc.c which also need to
handle unaligned bitmap access.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mfasheh@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoext4_{set,clear}_bit() is defined as __test_and_{set,clear}_bit_le() for
Akinobu Mita [Wed, 3 Aug 2011 00:52:43 +0000 (10:52 +1000)]
ext4_{set,clear}_bit() is defined as __test_and_{set,clear}_bit_le() for
ext4.  Only two ext4_{set,clear}_bit() calls check the return value.  The
rest of calls ignore the return value and they can be replaced with
__{set,clear}_bit_le().

This changes ext4_{set,clear}_bit() from __test_and_{set,clear}_bit_le()
to __{set,clear}_bit_le() and introduces ext4_test_and_{set,clear}_bit()
for the two places where old bit needs to be returned.

This ext4_{set,clear}_bit() change is considered safe, because if someone
uses these macros without noticing the change, new ext4_{set,clear}_bit
don't have return value and causes compiler errors where the return value
is used.

This also removes unused ext4_find_first_zero_bit().

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agodel_timer_sync() calls debug_object_assert_init() to assert that a timer
Christine Chan [Wed, 3 Aug 2011 00:52:42 +0000 (10:52 +1000)]
del_timer_sync() calls debug_object_assert_init() to assert that a timer
has been initialized before calling lock_timer_base().  lock_timer_base()
would spin forever on a NULL(uninit-ed) base.  The check is added to
del_timer() to prevent silent failure, even though it would not get stuck
in an infinite loop.

Signed-off-by: Christine Chan <cschan@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoAdd new check (assert_init) to make sure objects are initialized and
Christine Chan [Wed, 3 Aug 2011 00:52:42 +0000 (10:52 +1000)]
Add new check (assert_init) to make sure objects are initialized and
tracked by debugobjects.

Signed-off-by: Christine Chan <cschan@codeaurora.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe address limit is already set in flush_old_exec() so this
Mathias Krause [Wed, 3 Aug 2011 00:52:41 +0000 (10:52 +1000)]
The address limit is already set in flush_old_exec() so this
set_fs(USER_DS) is redundant.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe address limit is already set in flush_old_exec() so this
Mathias Krause [Wed, 3 Aug 2011 00:52:41 +0000 (10:52 +1000)]
The address limit is already set in flush_old_exec() so this
set_fs(USER_DS) is redundant.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoA straightforward looking use of idr for a device id.
Jonathan Cameron [Wed, 3 Aug 2011 00:52:40 +0000 (10:52 +1000)]
A straightforward looking use of idr for a device id.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <tj@kernel.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Acked-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agohwmon was using an idr with a NULL pointer, so convert to an
Jonathan Cameron [Wed, 3 Aug 2011 00:52:40 +0000 (10:52 +1000)]
hwmon was using an idr with a NULL pointer, so convert to an
ida which then allows use of Rusty's ida_simple_get.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agofb_set_suspend() must be called with the console semaphore held, which
Andrea Righi [Wed, 3 Aug 2011 00:52:39 +0000 (10:52 +1000)]
fb_set_suspend() must be called with the console semaphore held, which
means the code path coming in here will first take the console_lock() and
then call lock_fb_info().

However several framebuffer ioctl commands acquire these locks in reverse
order (lock_fb_info() and then console_lock()).  This gives rise to
potential AB-BA deadlock.

Fix this by changing the order of acquisition in the ioctl commands that
make use of console_lock().

Signed-off-by: Andrea Righi <arighi@develer.com>
Reported-by: Peter Nordström (Palm GBU) <peter.nordstrom@palm.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoSome messing with error codes to return 0 on out id's and match
Jonathan Cameron [Wed, 3 Aug 2011 00:52:39 +0000 (10:52 +1000)]
Some messing with error codes to return 0 on out id's and match
current situation.  Is this necessary? Looks a touch 'interesting'.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Tejun Heo <tj@kernel.org>
Cc: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoDon't dereference em if it's NULL or an error pointer.
Roel Kluin [Wed, 3 Aug 2011 00:52:38 +0000 (10:52 +1000)]
Don't dereference em if it's NULL or an error pointer.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoA call to va_copy() should always be followed by a call to va_end() in the
Jesper Juhl [Wed, 3 Aug 2011 00:52:38 +0000 (10:52 +1000)]
A call to va_copy() should always be followed by a call to va_end() in the
same function.  In kernel/autit.c::audit_log_vformat() this is not always
done.  This patch makes sure va_end() is always called.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Eric Paris <eparis@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe address limit is already set in flush_old_exec() so this
Mathias Krause [Wed, 3 Aug 2011 00:52:38 +0000 (10:52 +1000)]
The address limit is already set in flush_old_exec() so this
set_fs(USER_DS) is redundant.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoDon't allow everybody to use a modem.
Vasiliy Kulikov [Wed, 3 Aug 2011 00:52:37 +0000 (10:52 +1000)]
Don't allow everybody to use a modem.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Cc: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe current interrupt traces from irq_handler_entry and irq_handler_exit
Vaibhav Nagarnaik [Wed, 3 Aug 2011 00:52:37 +0000 (10:52 +1000)]
The current interrupt traces from irq_handler_entry and irq_handler_exit
provide when an interrupt is handled.  They provide good data about when
the system has switched to kernel space and how it affects the currently
running processes.

There are some IRQ vectors which trigger the system into kernel space,
which are not handled in generic IRQ handlers.  Tracing such events gives
us the information about IRQ interaction with other system events.

The trace also tells where the system is spending its time.  We want to
know which cores are handling interrupts and how they are affecting other
processes in the system.  Also, the trace provides information about when
the cores are idle and which interrupts are changing that state.

The following patch adds the event definition and trace instrumentation
for interrupt vectors.  For x86, a lookup table is provided to print out
readable IRQ vector names.  The template can be used to provide interrupt
vector lookup tables on other architectures.

Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Michael Rubin <mrubin@google.com>
Cc: David Sharp <dhsharp@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe x86 timer interrupt handler is the only handler not traced in the
Vaibhav Nagarnaik [Wed, 3 Aug 2011 00:52:37 +0000 (10:52 +1000)]
The x86 timer interrupt handler is the only handler not traced in the
irq/irq_handler_{entry|exit} trace events.

Add tracepoints to the interrupt handler to trace it.

Signed-off-by: Vaibhav Nagarnaik <vnagarnaik@google.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Michael Rubin <mrubin@google.com>
Cc: David Sharp <dhsharp@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoReplace the bubble sort in sanitize_e820_map() with a call to the generic
Mike Ditto [Wed, 3 Aug 2011 00:52:37 +0000 (10:52 +1000)]
Replace the bubble sort in sanitize_e820_map() with a call to the generic
kernel sort function to avoid pathological performance with large maps.

On large (thousands of entries) E820 maps, the previous code took minutes
to run; with this change it's now milliseconds.

Signed-off-by: Mike Ditto <mditto@google.com>
Cc: Stefan Assmann <sassmann@kpanic.de>
Cc: Nancy Yuen <yuenn@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoCc: Ed Wildgoose <git@wildgooses.com>
Andrew Morton [Wed, 3 Aug 2011 00:52:36 +0000 (10:52 +1000)]
Cc: Ed Wildgoose <git@wildgooses.com>
Cc: Ed Wildgoose <kernel@wildgooses.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThis new driver replaces the old PCEngines Alix 2/3 LED driver with a new
Ed Wildgoose [Wed, 3 Aug 2011 00:52:36 +0000 (10:52 +1000)]
This new driver replaces the old PCEngines Alix 2/3 LED driver with a new
driver that controls the LEDs through the leds-gpio driver.  The old
driver accessed GPIOs directly, which created a conflict and prevented
also loading the cs5535-gpio driver to read other GPIOs on the Alix board.
 With this new driver, we hook into leds-gpio which in turn uses GPIO to
control the LEDs and therefore it's possible to control both the LEDs and
access onboard GPIOs

Driver is moved to platform/geode and any other geode initialisation
modules should move here also.

This driver is inspired by leds-net5501.c by Alessandro Zummo.

Ideally, leds-net5501.c should also be moved to platform/geode.
Additionally the driver relies on parts of the patch: 7f131cf3ed ("leds:
leds-alix2c - take port address from MSR) by Daniel Mack to perform
detection of the Alix board.

Signed-off-by: Ed Wildgoose <kernel@wildgooses.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Daniel Mack <daniel@caiaq.de>
Reviewed-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoOn x86_32 casting the unsigned int result of get_random_int() to long may
Ludwig Nussel [Wed, 3 Aug 2011 00:52:36 +0000 (10:52 +1000)]
On x86_32 casting the unsigned int result of get_random_int() to long may
result in a negative value.  On x86_32 the range of mmap_rnd() therefore
was -255 to 255.  The 32bit mode on x86_64 used 0 to 255 as intended.

The bug was introduced by 675a081 ("x86: unify mmap_{32|64}.c") in January
2008.

Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThis makes the iris driver use the platform API, so it is properly exposed
Shérab [Wed, 3 Aug 2011 00:52:36 +0000 (10:52 +1000)]
This makes the iris driver use the platform API, so it is properly exposed
in /sys.

[akpm@linux-foundation.org: remove commented-out code, add missing space to printk, clean up code layout]
Signed-off-by: Shérab <Sebastien.Hinderer@ens-lyon.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoAdd support for Aspire 1410 BIOS v1.3314. Fixes the following error:
Clay Carpenter [Wed, 3 Aug 2011 00:52:35 +0000 (10:52 +1000)]
Add support for Aspire 1410 BIOS v1.3314.  Fixes the following error:

acerhdf: unknown (unsupported) BIOS version Acer/Aspire 1410/v1.3314,
please report, aborting!

Signed-off-by: Clay Carpenter <claycarpenter@gmail.com>
Signed-off-by: Peter Feuerer <peter@piie.net>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThe parameter's origin type is long. On an i386 architecture, it can
hank [Wed, 3 Aug 2011 00:52:34 +0000 (10:52 +1000)]
The parameter's origin type is long.  On an i386 architecture, it can
easily be larger than 0x80000000, causing this function to convert it to a
sign-extended u64 type.  Change the type to unsigned long so we get the
correct result.

[akpm@linux-foundation.org: build fix]
Signed-off-by: hank <pyu@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoWhen no floppy is found the module code can be released while a timer
Carsten Emde [Wed, 3 Aug 2011 00:52:32 +0000 (10:52 +1000)]
When no floppy is found the module code can be released while a timer
function is pending or about to be executed.

CPU0                                  CPU1
      floppy_init()
timer_softirq()
   spin_lock_irq(&base->lock);
   detach_timer();
   spin_unlock_irq(&base->lock);
   -> Interrupt
del_timer();
        return -ENODEV;
                                      module_cleanup();
   <- EOI
   call_timer_fn();
   OOPS

Use del_timer_sync() to prevent this.

Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoBecause of x86-implement-strict-user-copy-checks-for-x86_64.patch
KAMEZAWA Hiroyuki [Wed, 3 Aug 2011 00:52:32 +0000 (10:52 +1000)]
Because of x86-implement-strict-user-copy-checks-for-x86_64.patch

When compiling mm/mempolicy.c the following warning is shown.

In file included from arch/x86/include/asm/uaccess.h:572,
                 from include/linux/uaccess.h:5,
                 from include/linux/highmem.h:7,
                 from include/linux/pagemap.h:10,
                 from include/linux/mempolicy.h:70,
                 from mm/mempolicy.c:68:
In function `copy_from_user',
    inlined from `compat_sys_get_mempolicy' at mm/mempolicy.c:1415:
arch/x86/include/asm/uaccess_64.h:64: warning: call to `copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
  LD      mm/built-in.o

Fix this by passing correct buffer size value.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoOn thread exit shm_exit_ns() is called, it uses shm_ids(ns).rw_mutex. It
Vasiliy Kulikov [Wed, 3 Aug 2011 00:52:32 +0000 (10:52 +1000)]
On thread exit shm_exit_ns() is called, it uses shm_ids(ns).rw_mutex.  It
is initialized in shm_init(), but it is not called yet at the moment of
kernel threads exit.  Some kernel threads are created in
do_pre_smp_initcalls(), and shm_init() is called in do_initcalls().

Static initialization of shm_ids(init_ipc_ns).rw_mutex fixes the race.

It fixes a kernel oops:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
...
[<c0320090>] (__down_write_nested+0x88/0xe0) from [<c015da08>] (exit_shm+0x28/0x48)
[<c015da08>] (exit_shm+0x28/0x48) from [<c002e550>] (do_exit+0x59c/0x750)
[<c002e550>] (do_exit+0x59c/0x750) from [<c003eaac>] (____call_usermodehelper+0x13c/0x154)
[<c003eaac>] (____call_usermodehelper+0x13c/0x154) from [<c000f630>] (kernel_thread_exit+0x0/0x8)
Code: 1afffffa e597c00c e58d0000 e587d00c (e58cd000)

Reported-by: Manuel Lauss <manuel.lauss@googlemail.com>
Reported-by: Richard Weinberger <richard@nod.at>
Reported-by: Marc Zyngier <maz@misterjones.org>
Tested-by: Manuel Lauss <manuel.lauss@googlemail.com>
Tested-by: Richard Weinberger <richard@nod.at>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoThis patch makes two changes:
Will Drewry [Wed, 3 Aug 2011 00:52:30 +0000 (10:52 +1000)]
This patch makes two changes:
- check for trailing characters after parsing PARTNROFF=%d
- disable root_wait if a syntax error is seen

The former assures that bad input like
  root=PARTUUID=<validuuid>/PARTNROFF=5abc
properly fails by attempting to parse an extra character after the
integer.  If the integer is missing, sscanf will fail, but if it is
present, and there is a trailing non-nul character, then the extra
field will be parsed and the error case will be hit.

The latter assures that if rootwait has been specified, the error
message isn't flooded to the screen during rootwait's loop.  Instead of
adding printk ratelimiting, root_wait was disabled.  This stays true to
the rootwait goal of support asynchronous device arrival while still
providing users with helpful messages.  With ratelimiting or disabling
logging on rootwait, a range of edge cases turn up where the user would
not be informed of an error properly.

Signed-off-by: Will Drewry <wad@chromium.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoExpand root=PARTUUID=UUID syntax to support selecting a root partition by
Will Drewry [Wed, 3 Aug 2011 00:52:30 +0000 (10:52 +1000)]
Expand root=PARTUUID=UUID syntax to support selecting a root partition by
integer offset from a known, unique partition.  This approach provides
similar properties to specifying a device and partition number, but using
the UUID as the unique path prior to evaluating the offset.

For example,
  root=PARTUUID=99DE9194-FC15-4223-9192-FC243948F88B/PARTNROFF=1
selects the partition with UUID 99DE.. then select the next
partition.

This change is motivated by a particular usecase in Chromium OS where the
bootloader can easily determine what partition it is on (by UUID) but
doesn't perform general partition table walking.

That said, support for this model provides a direct mechanism for the user
to modify the root partition to boot without specifically needing to
extract each UUID or update the bootloader explicitly when the root
partition UUID is changed (if it is recreated to be larger, for instance).
 Pinning to a /boot-style partition UUID allows the arbitrary root
partition reconfiguration/modifications with slightly less ambiguity than
just [dev][partition] and less stringency than the specific root partition
UUID.

Signed-off-by: Will Drewry <wad@chromium.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
13 years agoMerge remote-tracking branch 'moduleh/module.h-split'
Stephen Rothwell [Fri, 19 Aug 2011 02:18:34 +0000 (12:18 +1000)]
Merge remote-tracking branch 'moduleh/module.h-split'

Conflicts:
include/linux/dmaengine.h

13 years agoMerge remote-tracking branch 'tmem/linux-next'
Stephen Rothwell [Fri, 19 Aug 2011 02:13:26 +0000 (12:13 +1000)]
Merge remote-tracking branch 'tmem/linux-next'

13 years agoMerge remote-tracking branch 'regmap/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 02:11:54 +0000 (12:11 +1000)]
Merge remote-tracking branch 'regmap/for-next'

13 years agoMerge remote-tracking branch 'namespace/master'
Stephen Rothwell [Fri, 19 Aug 2011 02:10:34 +0000 (12:10 +1000)]
Merge remote-tracking branch 'namespace/master'

13 years agoMerge remote-tracking branch 'sysctl/master'
Stephen Rothwell [Fri, 19 Aug 2011 02:09:13 +0000 (12:09 +1000)]
Merge remote-tracking branch 'sysctl/master'

13 years agoMerge remote-tracking branch 'percpu/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 02:07:46 +0000 (12:07 +1000)]
Merge remote-tracking branch 'percpu/for-next'

13 years agoMerge remote-tracking branch 'edac-amd/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 02:06:30 +0000 (12:06 +1000)]
Merge remote-tracking branch 'edac-amd/for-next'

13 years agoMerge remote-tracking branch 'xen-two/linux-next'
Stephen Rothwell [Fri, 19 Aug 2011 02:05:06 +0000 (12:05 +1000)]
Merge remote-tracking branch 'xen-two/linux-next'

13 years agoMerge remote-tracking branch 'xen/upstream/xen'
Stephen Rothwell [Fri, 19 Aug 2011 02:03:50 +0000 (12:03 +1000)]
Merge remote-tracking branch 'xen/upstream/xen'

Conflicts:
arch/x86/xen/Makefile

13 years agoMerge remote-tracking branch 'rcu/rcu/next'
Stephen Rothwell [Fri, 19 Aug 2011 01:57:14 +0000 (11:57 +1000)]
Merge remote-tracking branch 'rcu/rcu/next'

13 years agoMerge remote-tracking branch 'tip/auto-latest'
Stephen Rothwell [Fri, 19 Aug 2011 01:51:34 +0000 (11:51 +1000)]
Merge remote-tracking branch 'tip/auto-latest'

Conflicts:
arch/x86/mm/fault.c

13 years agoMerge remote-tracking branch 'devicetree/devicetree/next'
Stephen Rothwell [Fri, 19 Aug 2011 01:51:15 +0000 (11:51 +1000)]
Merge remote-tracking branch 'devicetree/devicetree/next'

Conflicts:
drivers/of/base.c

13 years agoMerge remote-tracking branch 'i7300_edac/linux_next'
Stephen Rothwell [Fri, 19 Aug 2011 01:49:55 +0000 (11:49 +1000)]
Merge remote-tracking branch 'i7300_edac/linux_next'

Conflicts:
arch/x86/kernel/cpu/mcheck/mce.c

13 years agoMerge remote-tracking branch 'i7core_edac/linux_next'
Stephen Rothwell [Fri, 19 Aug 2011 01:48:11 +0000 (11:48 +1000)]
Merge remote-tracking branch 'i7core_edac/linux_next'

13 years agoMerge remote-tracking branch 'fsnotify/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:45:23 +0000 (11:45 +1000)]
Merge remote-tracking branch 'fsnotify/for-next'

13 years agoMerge remote-tracking branch 'pm/linux-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:39:12 +0000 (11:39 +1000)]
Merge remote-tracking branch 'pm/linux-next'

13 years agoMerge remote-tracking branch 'trivial/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:37:49 +0000 (11:37 +1000)]
Merge remote-tracking branch 'trivial/for-next'

13 years agoMerge remote-tracking branch 'osd/linux-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:36:29 +0000 (11:36 +1000)]
Merge remote-tracking branch 'osd/linux-next'

13 years agoMerge remote-tracking branch 'watchdog/master'
Stephen Rothwell [Fri, 19 Aug 2011 01:35:01 +0000 (11:35 +1000)]
Merge remote-tracking branch 'watchdog/master'

13 years agoMerge remote-tracking branch 'agp/agp-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:33:57 +0000 (11:33 +1000)]
Merge remote-tracking branch 'agp/agp-next'

13 years agoMerge remote-tracking branch 'security/next'
Stephen Rothwell [Fri, 19 Aug 2011 01:31:23 +0000 (11:31 +1000)]
Merge remote-tracking branch 'security/next'

13 years agoMerge remote-tracking branch 'voltage/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:30:04 +0000 (11:30 +1000)]
Merge remote-tracking branch 'voltage/for-next'

13 years agoMerge remote-tracking branch 'viafb/viafb-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:28:36 +0000 (11:28 +1000)]
Merge remote-tracking branch 'viafb/viafb-next'

13 years agoMerge remote-tracking branch 'fbdev/master'
Stephen Rothwell [Fri, 19 Aug 2011 01:27:11 +0000 (11:27 +1000)]
Merge remote-tracking branch 'fbdev/master'

13 years agoMerge remote-tracking branch 'md/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:25:45 +0000 (11:25 +1000)]
Merge remote-tracking branch 'md/for-next'

13 years agoMerge remote-tracking branch 'slab/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:25:38 +0000 (11:25 +1000)]
Merge remote-tracking branch 'slab/for-next'

13 years agoMerge remote-tracking branch 'kgdb/kgdb-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:25:29 +0000 (11:25 +1000)]
Merge remote-tracking branch 'kgdb/kgdb-next'

13 years agoMerge remote-tracking branch 'mmc/mmc-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:24:10 +0000 (11:24 +1000)]
Merge remote-tracking branch 'mmc/mmc-next'

13 years agoMerge remote-tracking branch 'leds/for-mm'
Stephen Rothwell [Fri, 19 Aug 2011 01:24:04 +0000 (11:24 +1000)]
Merge remote-tracking branch 'leds/for-mm'

Conflicts:
drivers/leds/Kconfig

13 years agoMerge branch 'quilt/device-mapper'
Stephen Rothwell [Fri, 19 Aug 2011 01:21:45 +0000 (11:21 +1000)]
Merge branch 'quilt/device-mapper'

13 years agoMerge remote-tracking branch 'block/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:15:56 +0000 (11:15 +1000)]
Merge remote-tracking branch 'block/for-next'

13 years agoMerge remote-tracking branch 'input/next'
Stephen Rothwell [Fri, 19 Aug 2011 01:14:26 +0000 (11:14 +1000)]
Merge remote-tracking branch 'input/next'

13 years agoMerge branch 'quilt/rr'
Stephen Rothwell [Fri, 19 Aug 2011 01:13:07 +0000 (11:13 +1000)]
Merge branch 'quilt/rr'

13 years agoMerge remote-tracking branch 'cpufreq/next'
Stephen Rothwell [Fri, 19 Aug 2011 01:11:51 +0000 (11:11 +1000)]
Merge remote-tracking branch 'cpufreq/next'

13 years agoMerge remote-tracking branch 'sound-asoc/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:10:30 +0000 (11:10 +1000)]
Merge remote-tracking branch 'sound-asoc/for-next'

13 years agoMerge remote-tracking branch 'sound/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 01:09:06 +0000 (11:09 +1000)]
Merge remote-tracking branch 'sound/for-next'

13 years agoMerge remote-tracking branch 'crypto/master'
Stephen Rothwell [Fri, 19 Aug 2011 01:03:50 +0000 (11:03 +1000)]
Merge remote-tracking branch 'crypto/master'

13 years agoMerge remote-tracking branch 'l2-mtd/master'
Stephen Rothwell [Fri, 19 Aug 2011 01:02:32 +0000 (11:02 +1000)]
Merge remote-tracking branch 'l2-mtd/master'

Conflicts:
drivers/mtd/maps/lantiq-flash.c

13 years agoMerge remote-tracking branch 'bluetooth/master'
Stephen Rothwell [Fri, 19 Aug 2011 01:01:08 +0000 (11:01 +1000)]
Merge remote-tracking branch 'bluetooth/master'

13 years agoMerge remote-tracking branch 'wireless/master'
Stephen Rothwell [Fri, 19 Aug 2011 00:59:34 +0000 (10:59 +1000)]
Merge remote-tracking branch 'wireless/master'

Conflicts:
drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c
drivers/staging/ath6kl/os/linux/ar6000_drv.c

13 years agoMerge remote-tracking branch 'net/master'
Stephen Rothwell [Fri, 19 Aug 2011 00:47:33 +0000 (10:47 +1000)]
Merge remote-tracking branch 'net/master'

13 years agoMerge remote-tracking branch 'slave-dma/next'
Stephen Rothwell [Fri, 19 Aug 2011 00:44:14 +0000 (10:44 +1000)]
Merge remote-tracking branch 'slave-dma/next'

13 years agoMerge remote-tracking branch 'ibft/master'
Stephen Rothwell [Fri, 19 Aug 2011 00:44:07 +0000 (10:44 +1000)]
Merge remote-tracking branch 'ibft/master'

13 years agoMerge remote-tracking branch 'swiotlb/master'
Stephen Rothwell [Fri, 19 Aug 2011 00:43:59 +0000 (10:43 +1000)]
Merge remote-tracking branch 'swiotlb/master'

13 years agoMerge remote-tracking branch 'ieee1394/for-next'
Stephen Rothwell [Fri, 19 Aug 2011 00:42:38 +0000 (10:42 +1000)]
Merge remote-tracking branch 'ieee1394/for-next'

13 years agoMerge remote-tracking branch 'cpupowerutils/master'
Stephen Rothwell [Fri, 19 Aug 2011 00:41:24 +0000 (10:41 +1000)]
Merge remote-tracking branch 'cpupowerutils/master'