gcc 4.6+ has support for a externally_visible attribute that prevents the
optimizer from optimizing unused symbols away. Add a __visible macro to
use it with that compiler version or later.
This is used (at least) by the "Link Time Optimization" patchset.
Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andrew Vagin [Thu, 13 Sep 2012 00:58:11 +0000 (10:58 +1000)]
pid-namespace: limit value of ns_last_pid to (0, max_pid)
The kernel doesn't check the pid for negative values, so if you try to
write -2 to /proc/sys/kernel/ns_last_pid, you will get a kernel panic.
The crash happens because the next pid is -1, and alloc_pidmap() will try
to access to a nonexistent pidmap.
map = &pid_ns->pidmap[pid/BITS_PER_PAGE];
Signed-off-by: Andrew Vagin <avagin@openvz.org> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Chuck Lever [Thu, 13 Sep 2012 00:58:11 +0000 (10:58 +1000)]
include/net/sock.h: squelch compiler warning in sk_rmem_schedule()
In file included from linux/include/linux/tcp.h:227:0,
from linux/include/linux/ipv6.h:221,
from linux/include/net/ipv6.h:16,
from linux/include/linux/sunrpc/clnt.h:26,
from linux/net/sunrpc/stats.c:22:
linux/include/net/sock.h: In function `sk_rmem_schedule':
linux/nfs-2.6/include/net/sock.h:1339:13: warning: comparison between
signed and unsigned integer expressions [-Wsign-compare]
Seen with gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2) using the
-Wextra option.
c76562b6 ("netvm: prevent a stream-specific deadlock") accidentally
replaced the "size" parameter of sk_rmem_schedule() with an unsigned int.
This changes the semantics of the comparison in the return statement.
In sk_wmem_schedule we have syntactically the same comparison, but "size"
is a signed integer. In addition, __sk_mem_schedule() takes a signed
integer for its "size" parameter, so there is an implicit type conversion
in sk_rmem_schedule() anyway.
Revert the "size" parameter back to a signed integer so that the semantics
of the expressions in both sk_[rw]mem_schedule() are exactly the same.
Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: David Miller <davem@davemloft.net> Cc: Joonsoo Kim <js1304@gmail.com> Cc: David Rientjes <rientjes@google.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joonsoo Kim [Thu, 13 Sep 2012 00:58:10 +0000 (10:58 +1000)]
slub: consider pfmemalloc_match() in get_partial_node()
get_partial() is currently not checking pfmemalloc_match() meaning that it
is possible for pfmemalloc pages to leak to non-pfmemalloc users. This is
a problem in the following situation. Assume that there is a request from
normal allocation and there are no objects in the per-cpu cache and no
node-partial slab.
In this case, slab_alloc enters the slow path and new_slab_objects() is
called which may return a PFMEMALLOC page. As the current user is not
allowed to access PFMEMALLOC page, deactivate_slab() is called ([5091b74a:
mm: slub: optimise the SLUB fast path to avoid pfmemalloc checks]) and
returns an object from PFMEMALLOC page.
Next time, when we get another request from normal allocation,
slab_alloc() enters the slow-path and calls new_slab_objects(). In
new_slab_objects(), we call get_partial() and get a partial slab which was
just deactivated but is a pfmemalloc page. We extract one object from it
and re-deactivate.
"deactivate -> re-get in get_partial -> re-deactivate" occures repeatedly.
As a result, access to PFMEMALLOC page is not properly restricted and it
can cause a performance degradation due to frequent deactivation.
deactivation frequently.
This patch changes get_partial_node() to take pfmemalloc_match() into
account and prevents the "deactivate -> re-get in get_partial() scenario.
Instead, new_slab() is called.
Signed-off-by: Joonsoo Kim <js1304@gmail.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: David Miller <davem@davemloft.net> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joonsoo Kim [Thu, 13 Sep 2012 00:58:10 +0000 (10:58 +1000)]
slab: fix starting index for finding another object
In array cache, there is a object at index 0, check it.
Signed-off-by: Joonsoo Kim <js1304@gmail.com> Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: David Miller <davem@davemloft.net> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
slab: do ClearSlabPfmemalloc() for all pages of slab
Right now, we call ClearSlabPfmemalloc() for first page of slab when we
clear SlabPfmemalloc flag. This is fine for most swap-over-network use
cases as it is expected that order-0 pages are in use. Unfortunately it
is possible that that __ac_put_obj() checks SlabPfmemalloc on a tail page
and while this is harmless, it is sloppy. This patch ensures that the
head page is always used.
This problem was originally identified by Joonsoo Kim.
[js1304@gmail.com: Original implementation and problem identification] Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: David Miller <davem@davemloft.net> Cc: Chuck Lever <chuck.lever@oracle.com> Cc: Joonsoo Kim <js1304@gmail.com> Cc: David Rientjes <rientjes@google.com> Cc: Pekka Enberg <penberg@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Paul Clements [Thu, 13 Sep 2012 00:58:09 +0000 (10:58 +1000)]
nbd: clear waiting_queue on shutdown
Fix a serious but uncommon bug in nbd which occurs when there is heavy I/O
going to the nbd device while, at the same time, a failure (server,
network) or manual disconnect of the nbd connection occurs.
There is a small window between the time that the nbd_thread is stopped
and the socket is shutdown where requests can continue to be queued to
nbd's internal waiting_queue. When this happens, those requests are never
completed or freed.
The fix is to clear the waiting_queue on shutdown of the nbd device, in
the same way that the nbd request queue (queue_head) is already being cleared.
Signed-off-by: Paul Clements <paul.clements@steeleye.com> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Gang Wei [Thu, 13 Sep 2012 00:58:09 +0000 (10:58 +1000)]
MAINTAINERS: fix TXT maintainer list and source repo path
Signed-off-by: Gang Wei <gang.wei@intel.com> Cc: Richard L Maliszewski <richard.l.maliszewski@intel.com> Cc: Gang Wei <gang.wei@intel.com> Cc: Shane Wang <shane.wang@intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
linux-drf:/sys/devices/system/memory/memory0 # cat * 8000000000000000
cat: node0: Is a directory
cat: node1: Is a directory
cat: node2: Is a directory
cat: node3: Is a directory
0 8000000000000000
cat: power: Is a directory
1
online
cat: subsystem: Is a directory
And "echo offline > memory0/state" will cause following call trace:
kernel BUG at mm/memory_hotplug.c:885!
sh[6455]: bugcheck! 0 [1]
memory hotplug: reset pgdat->kswapd to NULL if creating kernel thread fails
If kthread_run() fails, pgdat->kswapd contains errno. When we stop this
thread, we only check whether pgdat->kswapd is NULL and access it. If it
contains errno, it will cause page fault. Reset pgdat->kswapd to NULL
when creating kernel thread fails can avoid this problem.
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Reviewed-by: Minchan Kim <minchan@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Olof Johansson [Mon, 17 Sep 2012 03:16:01 +0000 (20:16 -0700)]
Merge branch 'next/cleanup' into for-next
* next/cleanup: (218 commits)
ARM: OMAP1: Move SoC specific headers from plat to mach for omap1
ARM: OMAP2+ Move SoC specific headers to be local to mach-omap2
ARM: OMAP: Split plat/hardware.h, use local soc.h for omap2+
ARM: OMAP: Remove unused old gpio-switch.h
ARM: OMAP1: Move plat/irqs.h to mach/irqs.h
ARM: OMAP2+: Remove hardcoded IRQs and enable SPARSE_IRQ
ARM: OMAP2+: Prepare for irqs.h removal
W1: OMAP HDQ1W: Remove dependencies to mach/hardware.h
Input: omap-keypad: Remove dependencies to mach includes
ARM: OMAP: Move gpio.h to include/linux/platform_data
ARM: OMAP2+: Remove hardcoded twl4030 gpio_base, irq_base and irq_end
ARM: OMAP2+: Remove unused nand_irq for GPMC
ARM: OMAP2+: Make INTCPS_NR_IRQS local for mach-omap2/irq.c
ARM: OMAP1: Define OMAP1_INT_I2C locally
ARM: OMAP1: Move define of OMAP_LCD_DMA to dma.h
ARM: OMAP: unwrap strings
ARM: OMAP: clean up some smatch warnings, fix some printk(KERN_ERR ...
ARM: OMAP2+: clean up PRCM sections of the Makefile
ARM: OMAP2+: clean up OMAP clock Makefile sections
ARM: OMAP2+: clean up OMAP4 PRM & sleep build directives in Makefile
...
Olof Johansson [Mon, 17 Sep 2012 03:08:01 +0000 (20:08 -0700)]
Merge tag 'omap-cleanup-makefile-sparse-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/cleanup
From Tony Lindgren:
From Paul Walmsley <paul@pwsan.com>:
Clean up and standardize several parts of
arch/arm/mach-omap2/Makefile. Beyond readability and diffstat
improvements, the series should reduce the risk of conflicts during
future cleanups by ensuring related lines are in the same section of the
Makefile.
smatch and string-wrapping cleanups for the OMAP subarch code.
These changes fix some of the more meaningful warnings that smatch
returns for the OMAP subarch code, and unwraps strings that are
wrapped at the 80-column boundary, to conform with the current
practice.
* tag 'omap-cleanup-makefile-sparse-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP: unwrap strings
ARM: OMAP: clean up some smatch warnings, fix some printk(KERN_ERR ...
ARM: OMAP2+: clean up PRCM sections of the Makefile
ARM: OMAP2+: clean up OMAP clock Makefile sections
ARM: OMAP2+: clean up OMAP4 PRM & sleep build directives in Makefile
ARM: OMAP2+: move MPU INTCPS, secure monitor, SDRC build directives in Makefile
ARM: OMAP2+: clean up omap_hwmod.o build directives in Makefile
ARM: OMAP2+: clean up whitespace in Makefile
Olof Johansson [Mon, 17 Sep 2012 03:05:06 +0000 (20:05 -0700)]
Merge tag 'omap-cleanup-sparseirq-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into next/cleanup
From Tony Lindgren:
This branch contains changes needed to make omap2+
work properly with sparse IRQ. It also removes
dependencies to mach/hardware.h. These help moving
things towards ARM single zImage support.
This branch is based on a commit in tty-next
branch with omap-devel-gpmc-fixed-for-v3.7 and
cleanup-omap-tags-for-v3.7 merged in to keep things
compiling and sort out some merge conflicts.
* tag 'omap-cleanup-sparseirq-for-v3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP1: Move SoC specific headers from plat to mach for omap1
ARM: OMAP2+ Move SoC specific headers to be local to mach-omap2
ARM: OMAP: Split plat/hardware.h, use local soc.h for omap2+
ARM: OMAP: Remove unused old gpio-switch.h
ARM: OMAP1: Move plat/irqs.h to mach/irqs.h
ARM: OMAP2+: Remove hardcoded IRQs and enable SPARSE_IRQ
ARM: OMAP2+: Prepare for irqs.h removal
W1: OMAP HDQ1W: Remove dependencies to mach/hardware.h
Input: omap-keypad: Remove dependencies to mach includes
ARM: OMAP: Move gpio.h to include/linux/platform_data
ARM: OMAP2+: Remove hardcoded twl4030 gpio_base, irq_base and irq_end
ARM: OMAP2+: Remove unused nand_irq for GPMC
ARM: OMAP2+: Make INTCPS_NR_IRQS local for mach-omap2/irq.c
ARM: OMAP1: Define OMAP1_INT_I2C locally
ARM: OMAP1: Move define of OMAP_LCD_DMA to dma.h
Olof Johansson [Mon, 17 Sep 2012 03:03:42 +0000 (20:03 -0700)]
Merge branch 'depends/tty-omap-serial' into next/cleanup
This part of the tty tree (unfortunately with all the preceding patches
as well) is a dependency for some of the OMAP cleanups, so we've pulled
it in as a dependency based on agreement with Greg.
Olof Johansson [Mon, 17 Sep 2012 02:50:31 +0000 (19:50 -0700)]
Merge branch 'next/soc' into for-next
* next/soc:
ARM: OMAP: omap_device: idle devices with no driver bound
ARM: OMAP: omap_device: don't attempt late suspend if no driver bound
ARM: OMAP: omap_device: keep track of driver bound status
projects / karo-tx-linux.git / log