When crashkernel is not enabled, "echo 0 > /sys/kernel/kexec_crash_size"
OOPSes the kernel in crash_shrink_memory.  This happens when
crash_shrink_memory tries to release the 'crashk_res' resource which are
not reserved.  Also value of "/sys/kernel/kexec_crash_size" shows as 1,
which should be 0.

This patch fixes the OOPS in crash_shrink_memory and shows
"/sys/kernel/kexec_crash_size" as 0 when crash kernel memory is not
reserved.
Signed-off-by: Pavan Naregundi <pavan@linux.vnet.ibm.com>
Reviewed-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Simon Horman <horms@verge.net.au>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

A __naked function is defined in C but with a body completely implemented
by asm(), including any prologue and epilogue.  These asm() bodies expect
standard calling conventions for parameter passing.  Older GCCs implement
that correctly, but 4.[56] currently do not, see GCC PR44290.  In the
Linux kernel this breaks ARM, causing most arch/arm/mm/copypage-*.c
modules to get miscompiled, resulting in kernel crashes during bootup.

Part of the kernel fix is to augment the __naked function attribute to
also imply noinline and noclone.  This patch implements that, and has been
verified to fix boot failures with gcc-4.5 compiled 2.6.34 and 2.6.35-rc1
kernels.  The patch is a no-op with older GCCs.
Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The recent commit 1f0ce8b3 ("mm: Move ARCH_SLAB_MINALIGN and
ARCH_KMALLOC_MINALIGN to <linux/slab_def.h>") which moved the
ARCH_SLAB_MINALIGN default into the global header inadvertently broke FLAT
for a bunch of systems.  Blackfin systems now fail on any FLAT exec with:
Unable to read code+data+bss, errno 14 When your /init is a FLAT binary,
obviously this can be annoying ;).

This stems from the alignment usage in the FLAT loader.  The behavior
before was that FLAT would default to ARCH_SLAB_MINALIGN only if it was
defined, and this was only defined by arches when they wanted a larger
alignment value.  Otherwise it'd default to pointer alignment.  Arguably,
this is kind of hokey that the FLAT is semi-abusing defines it shouldn't.

So let's merge the two alignment requirements so the floor is never 0.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: David McCullough <davidm@snapgear.com>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: David Howells <dhowells@redhat.com>
Cc: David Woodhouse <David.Woodhouse@intel.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

WARNING: vmlinux.o(.data+0x196e8): Section mismatch in reference from the
variable lxfb_driver to the function .init.text:lxfb_probe() The variable
lxfb_driver references the function __init lxfb_probe()

This changes lxfb_probe and friends to use __devinit, and also adds
__devexit to lxfb_remove.
Signed-off-by: Andres Salomon <dilinger@queued.net>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

WARNING: vmlinux.o(.data+0x195d8): Section mismatch in reference from the
variable gxfb_driver to the function .init.text:gxfb_probe() The variable
gxfb_driver references the function __init gxfb_probe()

This changes gxfb_probe and friends to use __devinit, and also adds
__devexit to gxfb_remove.
Signed-off-by: Andres Salomon <dilinger@queued.net>
Cc: Jordan Crouse <jordan.crouse@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

OOM-waitqueue should be waken up when oom_disable is canceled.  This is a
fix for 3c11ecf4 ("memcg: oom kill disable and oom status").

How to test:
 Create a cgroup A...
 1. set memory.limit and memory.memsw.limit to be small value
 2. echo 1 > /cgroup/A/memory.oom_control, this disables oom-kill.
 3. run a program which must cause OOM.

A program executed in 3 will sleep by oom_waiqueue in memcg.  Then, how to
wake it up is problem.

 1. echo 0 > /cgroup/A/memory.oom_control (enable OOM-killer)
 2. echo big mem > /cgroup/A/memory.memsw.limit_in_bytes(allow more swap)

etc..

Without the patch, a task in slept can not be waken up.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Add support to the NOMMU /proc/pid/maps file to show which mapping is the stack
of the original thread after execve.  This is largely based on the MMU code.
Subsidiary thread stacks are not indicated.

For FDPIC, we now get:

	root:/> cat /proc/self/maps
	02064000-02067ccc rw-p 0004d000 00:01 22         /bin/busybox
	0206e000-0206f35c rw-p 00006000 00:01 295        /lib/ld-uClibc.so.0
	025f0000-025f6f0c r-xs 00000000 00:01 295        /lib/ld-uClibc.so.0
	02680000-026ba6b0 r-xs 00000000 00:01 297        /lib/libc.so.0
	02700000-0274d384 r-xs 00000000 00:01 22         /bin/busybox
	02816000-02817000 rw-p 00000000 00:00 0
	02848000-0284c0d8 rw-p 00000000 00:00 0
	02860000-02880000 rw-p 00000000 00:00 0          [stack]

The semi-downside here is that for FLAT, we get:

	root:/> cat /proc/155/maps
	029f0000-029f9000 rwxp 00000000 00:00 0          [stack]

The reason being that FLAT combines a whole lot of stuff into one map
(including the stack).  But this isn't any worse than the current output
(which is nothing), so screw it.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Greg Ungerer <gerg@snapgear.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

bitmap_find_next_zero_area requires the size of the bitmap, we instead
passed the last suitable position.  This made it impossible to allocate
from the end of the pool.

Fixes a regression introduced by 243797f5
("genalloc: use bitmap_find_next_zero_area").
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Cc: Zygo Blaxell <zygo.blaxell@xandros.com>
Cc: Tejun Heo <tj@kernel.org>
Acked-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  block: Don't count_vm_events for discard bio in submit_bio.
  cfq: fix recursive call in cfq_blkiocg_update_completion_stats()
  cfq-iosched: Fixed boot warning with BLK_CGROUP=y and CFQ_GROUP_IOSCHED=n
  cfq: Don't allow queue merges for queues that have no process references
  block: fix DISCARD_BARRIER requests
  cciss: set SCSI max cmd len to 16, as default is wrong
  cpqarray: fix two more wrong section type
  cpqarray: fix wrong __init type on pci probe function
  drbd: Fixed a race between disk-attach and unexpected state changes
  writeback: fix pin_sb_for_writeback
  writeback: add missing requeue_io in writeback_inodes_wb
  writeback: simplify and split bdi_start_writeback
  writeback: simplify wakeup_flusher_threads
  writeback: fix writeback_inodes_wb from writeback_inodes_sb
  writeback: enforce s_umount locking in writeback_inodes_sb
  writeback: queue work on stack in writeback_inodes_sb
  writeback: fix writeback completion notifications

list_for_each_entry_safe is not suitable to protect against concurrent
modification of the list. 6754af64 introduced a race in sb walking.

list_for_each_entry can use the trick of pinning the current entry in
the list before we drop and retake the lock because it subsequently
follows cur->next. However list_for_each_entry_safe saves n=cur->next
for following before entering the loop body, so when the lock is
dropped, n may be deleted.
Signed-off-by: Nick Piggin <npiggin@suse.de>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Frank Mayhar <fmayhar@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  tracing: Fix undeclared ENOSYS in include/linux/tracepoint.h
  perf record: prevent kill(0, SIGTERM);
  perf session: Remove threads from tree on PERF_RECORD_EXIT
  perf/tracing: Fix regression of perf losing kprobe events
  perf_events: Fix Intel Westmere event constraints
  perf record: Don't call newt functions when not initialized

Merge branch 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'irq-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  genirq: Deal with desc->set_type() changing desc->chip

Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: Prevent compiler from optimising the sched_avg_update() loop
  sched: Fix over-scheduling bug
  sched: Fix PROVE_RCU vs cpu_cgroup

Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  nohz: Fix nohz ratelimit

Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  sched: silence PROVE_RCU in sched_fork()
  idr: fix RCU lockdep splat in idr_get_next()
  rcu: apply RCU protection to wake_affine()

Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  x86, Calgary: Increase max PHB number
  x86: Fix rebooting on Dell Precision WorkStation T7400
  x86: Fix vsyscall on gcc 4.5 with -Os
  x86, pat: Proper init of memtype subtree_max_end
  um, hweight: Fix UML boot crash due to x86 optimized hweight
  x86, setup: Set ax register in boot vga query
  percpu, x86: Avoid warnings of unused variables in per cpu
  x86, irq: Rename gsi_end gsi_top, and fix off by one errors
  x86: use __ASSEMBLY__ rather than __ASSEMBLER__

* 'fixes' of ssh://master.kernel.org/~sfr/next-fixes:
  acpi: update gfp/slab.h includes
  ocfs2: update gfp/slab.h includes
  davinci: update gfp/slab.h includes
  arm: update gfp/slab.h includes
  v4l-dvb: update gfp/slab.h includes

* 'for-linus' of git://neil.brown.name/md:
  md/raid5: don't include 'spare' drives when reshaping to fewer devices.
  md/raid5: add a missing 'continue' in a loop.
  md/raid5: Allow recovered part of partially recovered devices to be in-sync
  md/raid5: More careful check for "has array failed".
  md: Don't update ->recovery_offset when reshaping an array to fewer devices.
  md/raid5: avoid oops when number of devices is reduced then increased.
  md: enable raid4->raid0 takeover
  md: clear layout after ->raid0 takeover
  md: fix raid10 takeover: use new_layout for setup_conf
  md: fix handling of array level takeover that re-arranges devices.
  md: raid10: Fix null pointer dereference in fix_read_error()
  Restore partition detection of newly created md arrays.

Implicit slab.h inclusion via percpu.h is about to go away.  Make sure
gfp.h or slab.h is included as necessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Len Brown <lenb@kernel.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

Implicit slab.h inclusion via percpu.h is about to go away.  Make sure
gfp.h or slab.h is included as necessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

Implicit slab.h inclusion via percpu.h is about to go away.  Make sure
gfp.h or slab.h is included as necessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

Implicit slab.h inclusion via percpu.h is about to go away.  Make sure
gfp.h or slab.h is included as necessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

Implicit slab.h inclusion via percpu.h is about to go away.  Make sure
gfp.h or slab.h is included as necessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: fix first chunk match in per_cpu_ptr_to_phys()
  percpu: fix trivial bugs in pcpu_build_alloc_info()

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (52 commits)
  phylib: Add autoload support for the LXT973 phy.
  ISDN: hysdn, fix potential NULL dereference
  vxge: fix memory leak in vxge_alloc_msix() error path
  isdn/gigaset: correct CAPI connection state storage
  isdn/gigaset: encode HLC and BC together
  isdn/gigaset: correct CAPI DATA_B3 Delivery Confirmation
  isdn/gigaset: correct CAPI voice connection encoding
  isdn/gigaset: honor CAPI application's buffer size request
  cpmac: do not leak struct net_device on phy_connect errors
  smc91c92_cs: fix the problem that lan & modem does not work simultaneously
  ipv6: fix NULL reference in proxy neighbor discovery
  Bluetooth: Bring back var 'i' increment
  xfrm: check bundle policy existance before dereferencing it
  sky2: enable rx/tx in sky2_phy_reinit()
  cnic: Disable statistics initialization for eth clients that do not support statistics
  net: add dependency on fw class module to qlcnic and netxen_nic
  snmp: fix SNMP_ADD_STATS()
  hso: remove setting of low_latency flag
  udp: Fix bogus UFO packet generation
  lasi82596: fix netdev_mc_count conversion
  ...

* 'bugfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6:
  NFSv4: Fix an embarassing typo in encode_attrs()
  NFSv4: Ensure that /proc/self/mountinfo displays the minor version number
  NFSv4.1: Ensure that we initialise the session when following a referral
  SUNRPC: Fix a re-entrancy bug in xs_tcp_read_calldir()
  nfs4 use mandatory attribute file type in nfs4_get_root

* 'sh/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6:
  clocksource: sh_cmt: Fix up bogus shift value.
  arch/sh/mm: Eliminate a double lock
  sh: Fix up IORESOURCE_PCI_FIXED usage in pcibios_fixup_device_resources().
  sh: remove duplicated #include

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  MAINTAINERS - Add an entry for the input MT protocol
  Input: wacom - fix serial number handling on Cintiq 21UX2
  Input: fixup X86_MRST selects
  Input: sysrq - fix "stuck" SysRq mode
  Input: ad7877 - fix spi word size to 16 bit
  Input: pcf8574_keypad - fix off by one in pcf8574_kp_irq_handler()

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs-2.6:
  ext3: update ctime when changing the file's permission by setfacl
  ext2: update ctime when changing the file's permission by setfacl

* 'virtio' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6:
  virtio-pci: disable msi at startup
  virtio: return ENOMEM on out of memory

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  PCI/PM: Do not use native PCIe PME by default

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
  ALSA: usb/endpoint, fix dangling pointer use
  ALSA: asihpi - Get rid of incorrect "long" types and casts.
  ASoC: DaVinci: Fix McASP hardware FIFO configuration
  ALSA: hda - Fix line-in for mb5 model MacBook (Pro) 5,1 / 5,2
  ALSA: usb-audio: fix UAC2 control value queries
  ALSA: usb-audio: parse UAC2 sample rate ranges correctly
  ALSA: usb-audio: fix control messages for USB_RECIP_INTERFACE
  ALSA: usb-audio: add check for faulty clock in parse_audio_format_rates_v2()
  ALSA: hda - Don't check capture source mixer if no ADC is available

* 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  hwmon: (k8temp) Bypass core swapping on single-core processors
  hwmon: (i5k_amb) Fix sysfs attribute for lockdep
  hwmon: (k10temp) Do not blacklist known working CPU models

* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  watchdog: at32ap700x_wdt: register misc device last in probe() function
  watchdog: [PATCH 3/3] imx2_wdt: fix section mismatch

* git://git.infradead.org/iommu-2.6:
  intel-iommu: Force-disable IOMMU for iGFX on broken Cantiga revisions.
  intel-iommu: Fix double lock in get_domain_for_dev()
  intel-iommu: Fix reference by physical address in intel_iommu_attach_device()

* 'for-linus' of git://gitorious.org/linux-omap-dss2/linux:
  OMAP: OMAPFB: fix rfbi.c compile error
  OMAPFB: LCDC: change update_mode to DISABLED when going suspend

* git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6:
  MAINTAINERS: change mailing list address for CIFS
  cifs: remove bogus first_time check in NTLMv2 session setup code
  cifs: don't call cifs_new_fileinfo unless cifs_open succeeds
  cifs: don't ignore cifs_posix_open_inode_helper return value
  cifs: clean up arguments to cifs_open_inode_helper
  cifs: pass instantiated filp back after open call
  cifs: move cifs_new_fileinfo call out of cifs_posix_open
  cifs: implement drop_inode superblock op
  cifs: don't attempt busy-file rename unless it's in same directory

* 'merge' of git://git.secretlab.ca/git/linux-2.6:
  powerpc/5200: fix lite5200 ethernet phy address
  powerpc/5200: Fix build error in sound code.
  powerpc/5200: fix oops during going to standby
  powerpc/5200: add lite5200 onboard I2C eeprom and flash
  maintainers: Add git trees for SPI and device tree
  of: Drop properties with "/" in their name

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mattst88/alpha-2.6:
  alpha: Fix de2104x driver failing to readout MAC address correctly
  alpha: Detect Super IO chip, no IDE on Avanti, enable EPP19
  alpha: fix pci_mmap_resource API breakage
  alpha: fix __arch_hweight32 typo