Currently, we initialize the "current" pointer in the PACA (which
is used by the "current" macro in the kernel) before calling
setup_system(). That means that early_setup() is called with
current still "NULL" which is -not- a good idea. It happens to
work so far but breaks with lockdep when early code calls printk.
This changes it so that all PACAs are statically initialized with
__current pointing to the init task. For non-0 CPUs, this is fixed
up before use.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Ishizaki Kou [Mon, 17 Mar 2008 10:05:18 +0000 (21:05 +1100)]
[POWERPC] hvcbeat: Fix buffer manipulation
This fixes a potential bug at drivers/char/hvc_beat.c.
- hvc_put_term_char routine will decrement "rest" variable twice,
and forget to advance "buf" pointer by "nlen" bytes.
This bug was not hit previously because the output handler in
drivers/char/hvc_console.c splits given output into 16 bytes
at maximum.
Reported-by: Timur Tabi <timur@freescale.com> Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Paul Mackerras <paulus@samba.org>
Jerone Young [Fri, 11 Apr 2008 19:03:33 +0000 (05:03 +1000)]
[POWERPC] 4xx: Add idle wait support for 44x platforms
This changes the cpu_idle loop for 44x platforms to utilize the Wait Enable
feature of the CPU. This helps virtulization solutions know when the guest
Linux kernel is in an idle state.
A command line option called "idle" is also added to allow people to change
the idle loop back to the original variation. This is done by setting
"idle=spin" on the kernel command line.
Signed-off-by: Jerone Young <jyoung5@us.ibm.com> Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Paul Mackerras [Sat, 12 Apr 2008 05:20:59 +0000 (15:20 +1000)]
[LMB] Restructure allocation loops to avoid unsigned underflow
There is a potential bug in __lmb_alloc_base where we subtract `size'
from the base address of a reserved region without checking whether
the subtraction could wrap around and produce a very large unsigned
value. In fact it probably isn't possible to hit the bug in practice
since it would only occur in the situation where we can't satisfy the
allocation request and there is a reserved region starting at 0.
This fixes the potential bug by breaking out of the loop when we get
to the point where the base of the reserved region is less than the
size requested. This also restructures the loop to be a bit easier to
follow.
The same logic got copied into lmb_alloc_nid_unreserved, so this makes
a similar change there. Here the bug is more likely to be hit because
the outer loop (in lmb_alloc_nid) goes through the memory regions in
increasing order rather than decreasing order as __lmb_alloc_base
does, and we are therefore more likely to hit the case where we are
testing against a reserved region with a base address of 0.
Paul Mackerras [Sat, 12 Apr 2008 05:20:59 +0000 (15:20 +1000)]
[LMB] Fix some whitespace and other formatting issues, use pr_debug
This makes no semantic changes. It fixes the whitespace and formatting
a bit, gets rid of a local DBG macro and uses the equivalent pr_debug
instead, and restructures one while loop that had a function call and
assignment in the condition to be a bit more readable. Some comments
about functions being called with relocation disabled were also removed
as they would just be confusing to most readers now that the code is
in lib/.
David S. Miller [Mon, 24 Mar 2008 09:50:48 +0000 (20:50 +1100)]
[LMB] Add lmb_alloc_nid()
A variant of lmb_alloc() that tries to allocate memory on a specified
NUMA node 'nid' but falls back to normal lmb_alloc() if that fails.
The caller provides a 'nid_range' function pointer which assists the
allocator. It is given args 'start', 'end', and pointer to integer
'this_nid'.
It places at 'this_nid' the NUMA node id that corresponds to 'start',
and returns the end address within 'start' to 'end' at which memory
assosciated with 'nid' ends.
This callback allows a platform to use lmb_alloc_nid() in just
about any context, even ones in which early_pfn_to_nid() might
not be working yet.
This function will be used by the NUMA setup code on sparc64, and also
it can be used by powerpc, replacing it's hand crafted
"careful_allocation()" function in arch/powerpc/mm/numa.c
If x86 ever converts it's NUMA support over to using the LMB helpers,
it can use this too as it has something entirely similar.
Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Paul Mackerras <paulus@samba.org>
Stephen Rothwell [Mon, 14 Apr 2008 02:00:47 +0000 (12:00 +1000)]
[POWERPC] remove include of asm/of_device.h from pmi.h
pmi.h does not diectly reference anything in of_device.h and of the two
files that include asm/pmi.h, one includes of_device.h and the other
includes of_platform.h (which includes of_device.h).
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Stephen Rothwell [Thu, 10 Apr 2008 06:43:47 +0000 (16:43 +1000)]
[POWERPC] iSeries: Make iseries_reg_save private to iSeries
Now that we have the alpaca, the reg_save_ptr is no longer needed in the
paca. Eradicate all global uses of it and make it static in the iSeries
lpardata.c
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Stephen Rothwell [Thu, 10 Apr 2008 06:39:18 +0000 (16:39 +1000)]
[POWERPC] iSeries: Use alternate paca structure for booting
The iSeries HV only needs the first two fields of the paca statically
initialised, so create an alternate paca that contains only those and
switch to our real paca immediately after boot.
This is in order to make the 1024 cpu patches easier since they will no
longer have to statically initialise the pacas for iSeries.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
The prpmc2800 platform requires a zImage formatted file with an
embedded dtb file. Rename the requested boot image file to
dtbImage.prpmc2800.
Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Acked-by: Mark A. Greer <mgreer@mvista.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
[POWERPC] mv643xx_eth: Prepare to support multiple silicon blocks
The mv643xx_eth driver is being modified to support multiple instances
of the ethernet silicon block on the same platform. Each block contains
a single register bank containing the registers for up to three ports
interleaved within that bank. This patch updates the PowerPC OF to
platform_device glue code to support multiple silicon blocks, each
with up to three ethernet ports. The main difference is that we now
allow multiple mv64x60_shared platform_devices to be registered and
we provide each port platform_device with a pointer to its associated
shared platform_device. The pointer will not be used until the
mv643xx_eth driver changes are committed.
Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Acked-by: Mark Greer <mgreer@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Mark A. Greer [Mon, 7 Apr 2008 22:10:34 +0000 (08:10 +1000)]
[POWERPC] prpmc2800: Clean up dts properties
Remove several unused (or software config only) properties.
Rename marvel node to "system-controller". Also, rename the
"block-index" property to "cell-index" to conform to current
practice.
Signed-off-by: Mark A. Greer <mgreer@mvista.com> Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Compatible names should refer to a specific version of the hardware,
without wildcards. Change each instance of mv64x60 to mv64360, which
is the oldest version we currently support.
Signed-off-by: Mark A. Greer <mgreer@mvista.com> Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
[POWERPC] prpmc2800: Fix frequencies in prpmc2800.dts
After the conversion to dts v1 format, seeing the frequencies
in decimal made it obvious that some of them had been
incorrectly truncated. This fixes them. Note that the PCI
frequency comes from a different source and is documented
as 66MHz, so it was left at 66000000.
Signed-off-by: Dale Farnsworth <dale@farnsworth.org> Acked-by: Mark A. Greer <mgreer@mvista.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
Stephen Rothwell [Fri, 11 Apr 2008 01:11:56 +0000 (11:11 +1000)]
[POWERPC] Fix MAX_ORDER config problem
The allyesconfig (among others) build was giving this:
In file included from include/linux/gfp.h:4,
from include/linux/slab.h:14,
from include/linux/percpu.h:5,
from include2/asm/time.h:18,
from include2/asm/cputime.h:26,
from include/linux/sched.h:67,
from
arch/powerpc/kernel/asm-offsets.c:17:
include/linux/mmzone.h:791:2: error: #error Allocator MAX_ORDER exceeds SECTION_SIZE
Kconfig options are order depenendent, so move the setting of
FORCE_MAX_ZONEORDER to after the setting of PPC_64K_PAGES. Also add an
explicit !PPC_64K_PAGES.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Paul Mackerras [Mon, 14 Apr 2008 03:59:02 +0000 (13:59 +1000)]
[POWERPC] Fix handling of unrecoverable SLB miss interrupts
If an SLB miss interrupt happens while the RI bit of MSR is zero, we
can't just return, because RI being zero indicates that SRR0/SRR1
potentially had live values in them, and the process of taking an
interrupt overwrites them.
This should never happen, but if it does, we try to print a nice oops
message. That doesn't work, however, because the code at unrecov_slb
assumes that the MMU has been turned on, but we call it with the MMU
off (and have done so since the SLB miss handler was rewritten to run
without turning the MMU on) -- except on iSeries, where everything runs
with the MMU on.
This fixes it by adding the necessary code to turn the MMU on if
necessary.
Merge branch 'docs' of git://git.lwn.net/linux-2.6
* 'docs' of git://git.lwn.net/linux-2.6:
Add additional examples in Documentation/spinlocks.txt
Move sched-rt-group.txt to scheduler/
Documentation: move rpc-cache.txt to filesystems/
Documentation: move nfsroot.txt to filesystems/
Spell out behavior of atomic_dec_and_lock() in kerneldoc
Fix a typo in highres.txt
Fixes to the seq_file document
Fill out information on patch tags in SubmittingPatches
Add the seq_file documentation
Mark Fasheh [Thu, 10 Apr 2008 20:55:21 +0000 (13:55 -0700)]
Add additional examples in Documentation/spinlocks.txt
Checkpatch will throw an error if code doesn't use the correct initializers
for static spinlocks:
ERROR: Use of SPIN_LOCK_UNLOCKED is deprecated: see Documentation/spinlocks.txt
This is fine, but Documentation/spinlocks.txt isn't very clear on how to
_use_ the new initializers for static variables. To save people time in the
future, I added two small examples of how to fix old-style static
initializers to be more lockdep friendly.
Signed-off-by: Mark Fasheh <mfasheh@suse.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
AS arch/s390/kernel/entry64.o
In file included from arch/s390/kernel/entry64.S:14:
include/linux/linkage.h:34: error: syntax error in macro parameter list
make[1]: *** [arch/s390/kernel/entry64.o] Error 1
make: *** [arch/s390/kernel] Error 2
and some other architectures. The reason is that some architectures add
the "-traditional" flag to the invocation of $(AS), which disables
variadic macro argument support.
So just surround the new define with an #ifndef __ASSEMBLY__ to prevent
any side effects on asm code.
Cc: Roland McGrath <roland@redhat.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6
* 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6:
i2c-tiny-usb: New VID/PID pair
i2c-davinci: Fix lost interrupt
i2c-ibm_iic: Fast mode parm desc fixup
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6:
[NETNS][IPV6] tcp - assign the netns for timewait sockets
[IPV4]: Fix byte value boundary check in do_ip_getsockopt().
BNX2X: Correct bringing chip out of reset
[NETFILTER]: nf_nat: autoload IPv4 connection tracking
[NETFILTER]: xt_hashlimit: fix mask calculation
[XFRM]: xfrm_user: fix selector family initialization
rt61pci: rt61pci_beacon_update do not free skb twice
ssb-mipscore: Fix interrupt vectors
ssb-pcicore: Fix IRQ TPS flag handling
mac80211: use short_preamble mode from capability if ERP IE not present
[NET]: Undo code bloat in hot paths due to print_mac().
[TCP]: Don't allow FRTO to take place while MTU is being probed
[TCP]: tcp_simple_retransmit can cause S+L
[TCP]: Fix NewReno's fast rexmit/recovery problems with GSOed skb
[TCP]: Restore 2.6.24 mark_head_lost behavior for newreno/fack
nl80211: fix STA AID bug
b43legacy: fix bcm4303 crash
iwlwifi: fix n-band association problem
ipw2200: set MAC address on radiotap interface
libertas: fix mode initialization problem
pnp: increase number of devices supported per protocol
Increase the PNP "number of devices" limit. We currently use an unsigned
char, which limits us to 256 devices per protocol. This patch changes that to
an unsigned int.
Not all backends can take advantage of this: we limit ISAPNP to 10 devices in
isapnp_cfg_begin(), and PNPBIOS is limited to 256 devices because the BIOS
interfaces use a one-byte device node number.
But there is no limit on the number of PNPACPI devices we may have. Large HP
Integrity machines have more than 256, which causes the current "unsigned char
number" to wrap around. This causes errors like this:
pnp: PnP ACPI init
kobject_add failed for 00:00 with -EEXIST, don't try to register things with the same name in the same directory.
This patch increases the limit to fix this PNPACPI problem. It should not
have any adverse effect on ISAPNP or PNPBIOS because their limits are still
enforced in the backends.
Dan Williams [Fri, 11 Apr 2008 04:29:27 +0000 (21:29 -0700)]
md: close a livelock window in handle_parity_checks5
If a failure is detected after a parity check operation has been initiated,
but before it completes handle_parity_checks5 will never quiesce operations on
the stripe.
Explicitly handle this case by "canceling" the parity check, i.e. clear the
STRIPE_OP_CHECK flags and queue the stripe on the handle list again to refresh
any non-uptodate blocks.
Kernel versions >= 2.6.23 are susceptible.
Cc: <stable@kernel.org> Cc: NeilBrown <neilb@suse.de> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Mike Pagano [Fri, 11 Apr 2008 04:29:26 +0000 (21:29 -0700)]
cciss: error: implicit declaration of function 'sg_init_table'
This patch adds the missing include directive <linux/scatterlist.h> to the
cciss.c source file. This was discovered by our release team when building
the kernel for the Alpha architecture.
Errors were found as references to functions 'sg_init_table' and 'sg_page' do
not exist without the include for Alpha.
Signed-off-by: Mike Pagano <mpagano@gentoo.org> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Kay Sievers [Fri, 11 Apr 2008 04:29:25 +0000 (21:29 -0700)]
rtc: fix platform driver hotplug/coldplug
Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is
prefixed with "platform:". Add MODULE_ALIAS() to the hotpluggable RTC
platform drivers, to re-enable module auto loading.
[dbrownell@users.sourceforge.net: more drivers, minor fix] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Greg KH <greg@kroah.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Kay Sievers [Fri, 11 Apr 2008 04:29:23 +0000 (21:29 -0700)]
watchdog: fix platform driver hotplug/coldplug
Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is
prefixed with "platform:". Add MODULE_ALIAS() to the hotpluggable watchdog
drivers, to re-enable auto loading.
[dbrownell@users.sourceforge.net: more drivers; registration fixes] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Wim Van Sebroeck <wim@iguana.be> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Kay Sievers [Fri, 11 Apr 2008 04:29:22 +0000 (21:29 -0700)]
usb host: fix platform driver hotplug/coldplug
Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is
prefixed with "platform:". Add MODULE_ALIAS() to the hotpluggable USB HCDs,
to allow re-enable auto loading.
[dbrownell@users.sourceforge.net: more drivers; registration fixes] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Kay Sievers [Fri, 11 Apr 2008 04:29:21 +0000 (21:29 -0700)]
usb gadget: fix platform driver hotplug/coldplug
Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is
prefixed with "platform:". Add MODULE_ALIAS() to the hotpluggable usb
peripheral drivers, to re-eable module auto loading.
[dbrownell@users.sourceforge.net: registration fixes] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Kay Sievers [Fri, 11 Apr 2008 04:29:20 +0000 (21:29 -0700)]
spi: fix platform driver hotplug/coldplug
Since 43cc71eed1250755986da4c0f9898f9a635cb3bf, the platform modalias is
prefixed with "platform:". Add MODULE_ALIAS() to the hotpluggable SPI
platform drivers, to allow module auto loading.
[dbrownell@users.sourceforge.net: more drivers: registration fixes] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Jeff Roberson discovered a race when using kaio eventfd based notifications.
When it occurs it can lead tomissed wakeups and hung userspace.
This patch fixes the race by moving the notification inside the spinlocked
section of kaio. The operation is safe since eventfd spinlock and kaio one
are unrelated.
Signed-off-by: Davide Libenzi <davidel@xmailserver.org> Cc: Zach Brown <zach.brown@oracle.com> Cc: Jeff Roberson <jroberson@chesapeake.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Randy Dunlap [Fri, 11 Apr 2008 04:29:18 +0000 (21:29 -0700)]
rtc: rtc-s35390a.c needs the bitreverse library
rtc-s35390a uses BITREVERSE functions so it needs to select that config symbol
to ensure that the functions are built.
drivers/built-in.o: In function `s35390a_set_datetime':
linux-2.6.25-rc8-git7/drivers/rtc/rtc-s35390a.c:144: undefined reference to `byte_rev_table'
drivers/built-in.o: In function `s35390a_get_datetime':
linux-2.6.25-rc8-git7/drivers/rtc/rtc-s35390a.c:163: undefined reference to `byte_rev_table'
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Paul Menage [Fri, 11 Apr 2008 04:29:16 +0000 (21:29 -0700)]
cgroups: include hierarchy ids in /proc/<pid>/cgroup
Extend the /proc/<pid>/cgroup file to include the appropriate hierarchy ID on
each line.
Currently this ID isn't really needed since a hierarchy can be completely
identified by the set of subsystems bound to it, but this is likely to change
in the near future in order to support stateless subsystems and
merging/rebinding of subsystems. Getting this change into 2.6.25 reduces the
need for an API change later.
Signed-off-by: Paul Menage <menage@google.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Till Harbaum [Fri, 11 Apr 2008 10:07:05 +0000 (12:07 +0200)]
i2c-tiny-usb: New VID/PID pair
I have recently bought some USB PIDs from EZPrototypes for my USB projects
and one will be for the i2c-tiny-usb. I have not yet started to use the new
one in the official i2c-tiny-usb firmware since i think it makes sense to get
the change into the kernel before releasing a modified firmware.
This patch adds support for the EZPrototypes USB vid/pid pair used in later
i2c-tiny-usb firmware versions (avrusb v1.06 and up, usbtiny v2.06 and up).
Signed-off-by: Till Harbaum <Till@Harbaum.org> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Paul Mundt [Fri, 11 Apr 2008 10:07:04 +0000 (12:07 +0200)]
i2c-ibm_iic: Fast mode parm desc fixup
Noticed this when grepping for fast mode module params, the i2c-ibm_iic
driver was using a non-existent variable for MODULE_PARM_DESC. Fix it up
to reflect what it's actually supposed to be describing.
Signed-off-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Add commentary about the new "asmlinkage_protect()" macro
It's really a pretty ugly thing to need, and some day it will hopefully
be obviated by teaching gcc about the magic calling conventions for the
low-level system call code, but in the meantime we can at least add big
honking comments about why we need these insane and strange macros.
I took my comments from my version of the macro, but I ended up deciding
to just pick Roland's version of the actual code instead (with his
prettier syntax that uses vararg macros). Thus the previous two commits
that actually implement it.
Roland McGrath [Thu, 10 Apr 2008 22:38:45 +0000 (15:38 -0700)]
asmlinkage_protect sys_io_getevents
Use asmlinkage_protect in sys_io_getevents, because GCC for i386 with
CONFIG_FRAME_POINTER=n can decide to clobber an argument word on the
stack, i.e. the user struct pt_regs. Here the problem is not a tail
call, but just the compiler's use of the stack when it inlines and
optimizes the body of the called function. This seems to avoid it.
Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Roland McGrath [Thu, 10 Apr 2008 22:37:38 +0000 (15:37 -0700)]
asmlinkage_protect replaces prevent_tail_call
The prevent_tail_call() macro works around the problem of the compiler
clobbering argument words on the stack, which for asmlinkage functions
is the caller's (user's) struct pt_regs. The tail/sibling-call
optimization is not the only way that the compiler can decide to use
stack argument words as scratch space, which we have to prevent.
Other optimizations can do it too.
Until we have new compiler support to make "asmlinkage" binding on the
compiler's own use of the stack argument frame, we have work around all
the manifestations of this issue that crop up.
More cases seem to be prevented by also keeping the incoming argument
variables live at the end of the function. This makes their original
stack slots attractive places to leave those variables, so the compiler
tends not clobber them for something else. It's still no guarantee, but
it handles some observed cases that prevent_tail_call() did not.
Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This patch also resolves hangs on boot:
http://lkml.org/lkml/2008/2/23/263
http://bugzilla.kernel.org/show_bug.cgi?id=10093
The bug was causing once-in-few-reboots 10-15 sec wait during boot on
certain laptops.
Earlier commit 40d6a146629b98d8e322b6f9332b182c7cbff3df added
smp_call_function in cpu_idle_wait() to kick cpus that are in tickless
idle. Looking at cpu_idle_wait code at that time, code seemed to be
over-engineered for a case which is rarely used (while changing idle
handler).
Below is a simplified version of cpu_idle_wait, which just makes a dummy
smp_call_function to all cpus, to make them come out of old idle handler
and start using the new idle handler. It eliminates code in the idle
loop to handle cpu_idle_wait.
David Howells [Thu, 10 Apr 2008 15:11:05 +0000 (16:11 +0100)]
FRV: Don't make smp_{r, w, }mb() interpolate MEMBAR when CONFIG_SMP=n [try #2]
Don't make smp_{r,w,}mb() interpolate a MEMBAR instruction when CONFIG_SMP=n as
SMP memory barries on UP systems should interpolate a compiler barrier only.
Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Howells [Thu, 10 Apr 2008 15:11:00 +0000 (16:11 +0100)]
FRV: Make NOMMU-mode work with base addresses other than 0xC0000000 [try #2]
Make NOMMU-mode work with base addresses other than 0xC0000000 by:
(1) Giving the code that sets up the protection registers the right address
in __sdram_base. Rather than being hard coded to 0xC0000000, the value
of __page_offset is obtained from the linker script.
(2) Eliminate the check in __switch_to() that verifies the current thread
info is in the 0xCxxxxxxx region.
Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Howells [Thu, 10 Apr 2008 15:10:45 +0000 (16:10 +0100)]
FRV: Handle update_mmu_cache() being called when current->mm is NULL [try #2]
Handle update_mmu_cache() being called when current->mm is NULL.
We cache static TLB mappings for the current page table in DAMPR4 and DAMPR5
on the theory that the next data lookup is likely to be in the same general
region, and thus is likely to be mapped by the same page table. However, we
can't get this information if we can't access the appropriate mm_struct.
If current->mm is NULL, we just clear the cache in the knowledge that the TLB
miss handlers will load it.
Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
* 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6:
[XFS] Ensure "both" features2 slots are consistent
[XFS] Fix superblock features2 field alignment problem
[XFS] remove shouting-indirection macros from xfs_sb.h
Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
cfq-iosched: do not leak ioc_data across iosched switches
splice: fix infinite loop in generic_file_splice_read()
Roman Zippel [Wed, 9 Apr 2008 15:44:07 +0000 (17:44 +0200)]
HFS+: fix unlink of links
Some time ago while attempting to handle invalid link counts, I botched
the unlink of links itself, so this patch fixes this now correctly, so
that only the link count of nodes that don't point to links is ignored.
Thanks to Vlado Plaga <rechner@vlado-do.de> to notify me of this
problem.
Signed-off-by: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
The ttl returned will be wrong on big-endian, and on both little-
endian and big-endian the next three bytes in userspace are written
with garbage.
It's because of this test in do_ip_getsockopt():
if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
It should allow a 'val' of 255 to pass here, but it doesn't so it
copies a full 'int' back to userspace.
On little-endian that will write the correct value into the location
but it spams on the next three bytes in userspace. On big endian it
writes the wrong value into the location and spams the next three
bytes.
Signed-off-by: David S. Miller <davem@davemloft.net>
cfq-iosched: do not leak ioc_data across iosched switches
When switching scheduler from cfq, cfq_exit_queue() does not clear
ioc->ioc_data, leaving a dangling pointer that can deceive the following
lookups when the iosched is switched back to cfq. The pattern that can
trigger that is the following:
- elevator switch from cfq to something else;
- module unloading, with elv_unregister() that calls cfq_free_io_context()
on ioc freeing the cic (via the .trim op);
- module gets reloaded and the elevator switches back to cfq;
- reallocation of a cic at the same address as before (with a valid key).
To fix it just assign NULL to ioc_data in __cfq_exit_single_io_context(),
that is called from the regular exit path and from the elevator switching
code. The only path that frees a cic and is not covered is the error handling
one, but cic's freed in this way are never cached in ioc_data.
Eric Sandeen [Thu, 10 Apr 2008 02:19:34 +0000 (12:19 +1000)]
[XFS] Ensure "both" features2 slots are consistent
Since older kernels may look in the sb_bad_features2 slot for flags,
rather than zeroing it out on fixup, we should make it equal to the
sb_features2 value.
Also, if the ATTR2 flag was not found prior to features2 fixup, it was not
set in the mount flags, so re-check after the fixup so that the current
session will use the feature.
Also fix up the comments to reflect these changes.
David Chinner [Thu, 6 Mar 2008 02:45:50 +0000 (13:45 +1100)]
[XFS] Fix superblock features2 field alignment problem
Due to the xfs_dsb_t structure not being 64 bit aligned, the last field of
the on-disk superblock can vary in location This causes problems when the
filesystem gets moved to a different platform, or there is a 32 bit
userspace and 64 bit kernel.
This patch detects the defect at mount time, logs a warning such as:
XFS: correcting sb_features alignment problem
in dmesg and corrects the problem so that everything is OK. it also
blacklists the bad field in the superblock so it does not get used for
something else later on.
splice: fix infinite loop in generic_file_splice_read()
There's a quirky loop in generic_file_splice_read() that could go
on indefinitely, if the file splice returns 0 permanently (and not
just as a temporary condition). Get rid of the loop and pass
back -EAGAIN correctly from __generic_file_splice_read(), so we
handle that condition properly as well.
David S. Miller [Thu, 10 Apr 2008 02:39:25 +0000 (19:39 -0700)]
[SPARC]: Fix several regset and ptrace bugs.
1) ptrace should pass 'current' to task_user_regset_view()
2) When fetching general registers using a 64-bit view, and
the target is 32-bit, we have to convert.
3) Skip the whole register window get/set code block if
the user isn't asking to access anything in there.
Otherwise we have problems if the user doesn't have
an address space setup. Fetching ptrace register is
still valid at such a time, and ptrace does not try
to access the register window area of the regset.
Signed-off-by: David S. Miller <davem@davemloft.net>
Steven Rostedt [Wed, 9 Apr 2008 23:04:07 +0000 (19:04 -0400)]
pop previous section in alternative.c
gcc expects all toplevel assembly to return to the original section type.
The code in alteranative.c does not do this. This caused some strange bugs
in sched-devel where code would end up in the .rodata section and when
the kernel sets the NX bit on all .rodata, the kernel would crash when
executing this code.
This patch adds a .previous marker to return the code back to the
original section.
Credit goes to Andrew Pinski for telling me it wasn't a gcc bug but a
bug in the toplevel asm code in the kernel. ;-)
Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Eric Paris [Wed, 9 Apr 2008 18:08:35 +0000 (14:08 -0400)]
SELinux: don't BUG if fs reuses a superblock
I (wrongly) assumed that nfs_xdev_get_sb() would not ever share a superblock
and so cloning mount options would always be correct. Turns out that isn't
the case and we could fall over a BUG_ON() that wasn't a BUG at all. Since
there is little we can do to reconcile different mount options this patch
just leaves the sb alone and the first set of options wins.
Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: James Morris <jmorris@namei.org>
Without this patch, the generic L3 tracker would kick in
if nf_conntrack_ipv4 was not loaded before nf_nat, which
would lead to translation problems with ICMP errors.
NAT does not make sense without IPv4 connection tracking
anyway, so just add a call to need_ipv4_conntrack().
Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Patrick McHardy [Wed, 9 Apr 2008 22:08:24 +0000 (15:08 -0700)]
[XFRM]: xfrm_user: fix selector family initialization
Commit df9dcb45 ([IPSEC]: Fix inter address family IPsec tunnel handling)
broke openswan by removing the selector initialization for tunnel mode
in case it is uninitialized.
This patch restores the initialization, fixing openswan, but probably
breaking inter-family tunnels again (unknown since the patch author
disappeared). The correct thing for inter-family tunnels is probably
to simply initialize the selector family explicitly.
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Daniel Wagner [Wed, 9 Apr 2008 14:29:01 +0000 (16:29 +0200)]
rt61pci: rt61pci_beacon_update do not free skb twice
The layer above will free the skb in an error case.
Signed-off-by: Daniel Wagner <wagi@monom.org> Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev
* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev:
ata/sata_fsl: Remove unused variable in sata_fsl_probe
pata_sil680: Fix build on arch/ppc
Vladimir Koutny [Mon, 31 Mar 2008 15:05:10 +0000 (17:05 +0200)]
mac80211: use short_preamble mode from capability if ERP IE not present
When associating to a b-only AP where there is no ERP IE, short preamble
mode is left at previous state (probably also protection mode). In this
case, disable protection and use short preamble mode as specified in
capability field. The same is done if capability field is changed on-the-fly.
Signed-off-by: Vladimir Koutny <vlado@ksp.sk> Signed-off-by: John W. Linville <linville@tuxdriver.com>
ata/sata_fsl: Remove unused variable in sata_fsl_probe
In sata_fsl_probe memory is allocated but never used or deallocated. Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=10404
Thanks to Daniel Marjamäki for the bug report.
Reported-by: Daniel Marjamäki <danielm77@spray.se> Signed-off-by: Johann Felix Soden <johfel@users.sourceforge.net> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Merge branch 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
* 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
SUNRPC: Fix a memory leak in rpc_create()
fix bug - executing FDPIC ELF on NFS mount triggers BUG() at mm/nommu.c:862:/do_mmap_private()
NFS: initialize flags field in nfs_open_context
SUNRPC: don't call flush_dcache_page() with an invalid pointer
mtd/chips: add missing set_current_state() to cfi_{amdstd,staa}_sync()
cfi_amdstd_sync() and cfi_staa_sync() call schedule() without changing task's
state appropriately.
In case of e.g. chip->state == FL_ERASING, cfi_*_sync() will be busy-looping
either redundantly for a fixed interval of time (for SCHED_NORMAL tasks) or
possibly endlessly (for RT tasks and UP).
Signed-off-by: Dmitry Adamushko <dmitry.adamushko@gmail.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
David Brownell [Wed, 9 Apr 2008 00:41:58 +0000 (17:41 -0700)]
spi: documentation tweaks
Update SPI documentation to clarify some areas of recent confusion: clock
polarity takes effect when chipselect goes active; and zero length buffers are
OK in certain cases.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Fix bug in SPI probe: first initialize peripheral pins, and just after
register spi master device. This fixes problems with SPI drivers built-in
kernel.
Singed-off-by: Vitja Makarov <vitja.makarov@gmail.com> Signed-off-by: Bryan Wu <cooloney@kernel.org> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
acpi: fix "buggy BIOS check" when CPUs are hot removed
Fixes a BUG in ACPI hotplugging.
processor_device_array[pr->id] needs to be set to NULL when removing a CPU.
Else the "buggy BIOS check" in acpi_processor_start mistakenly fires when a
CPU is removed from the system and then later re-added.
Signed-off-by: Alok N Kataria <akataria@vmware.com> Signed-off-by: Dan Arai <arai@vmware.com> Cc: Len Brown <lenb@kernel.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
snd_es1968_ac97_read() calls snd_es1968_ac97_wait() first outside a locked
area, and later, while holding a lock.
snd_es1968_ac97_wait() has a polling loop with a cond_resched() inside it..
which sleeps, so the second call is invalid.
This patch adds a version of the wait function that just pure polls. While
this is not very elegant in principle, it's very likely the easiest thing to
do here, we already checked if the chip was ready (while yielding) just
before, so it is very unlikely to take a long time here.
[akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Cc: Jaroslav Kysela <perex@suse.cz> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
N_NORMAL_MEMORY is "true" if a node has memory for the kernel. N_HIGH_MEMORY
is "true" if a node has memory for HIGHMEM. (If CONFIG_HIGHMEM=n, always
"true")
This check is used for testing whether we can use kmalloc_node() on a node.
Then, if there is a node which only contains HIGHMEM, the system will call
kmalloc_node() which doesn't contain memory for the kernel. If it happens
under SLUB, the kernel will panic. I think this only happens on x86_32-numa.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Krzysztof Helt [Wed, 9 Apr 2008 00:41:52 +0000 (17:41 -0700)]
acpi thermal: fix result check
thermal_zone_device_register() uses the ERR_PTR macro on its return values. A
correct check is to use the IS_ERR() macro.
The 2.6.25 kernels panic on Compaq AP550 without this patch as it has more
then 10 (THERMAL_MAX_TRIPS) trip points (there are 12).
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Cc: Len Brown <lenb@kernel.org> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Pete Zaitcev [Wed, 9 Apr 2008 00:41:51 +0000 (17:41 -0700)]
ub: remove BUG() after __blk_end_request and fix the condition causing it
When __blk_end_request returns nonzero, it means that the request was
not completely processed and some BIOs are still attached. Since we
have dequeued it by that time, it means leaking requests and hanging
processes, which is why BUG() was in there. In ub this happens if
a packet request ends normally, but with residue (e.g. when scsi_id
issues INQUIRY).
The fix is to make sure that arguments passed to __blk_end_request
are correct: the full request length and not just transferred length.
The transferred length is indicated to applications by adjusting
rq->data_len with old, unchanged code outside of this patch.
Signed-off-by: Pete Zaitcev <zaitcev@redhat.com> Cc: Kiyoshi Ueda <k-ueda@ct.jp.nec.com> Cc: Greg KH <greg@kroah.com> Cc: Boaz Harrosh <bharrosh@panasas.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Chuck Lever [Mon, 7 Apr 2008 20:52:44 +0000 (16:52 -0400)]
SUNRPC: Fix a memory leak in rpc_create()
Commit 510deb0d was supposed to move the xprt_create_transport() call in
rpc_create(), but neglected to remove the old call site. This resulted in
a transport leak after every rpc_create() call.
This leak is present in 2.6.24 and 2.6.25.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
projects / karo-tx-linux.git / log