linux/include
Linus Torvalds 54539cd217 Merge branch 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
Pull percpu fix from Tejun Heo:
 "It is very late but this is an important percpu-refcount fix from
  Sebastian Ott.

  The problem is that percpu_ref_*() used __this_cpu_*() instead of
  this_cpu_*().  The difference between the two is that the latter is
  atomic on the local cpu while the former is not.  this_cpu_inc() is
  guaranteed to increment the percpu counter on the cpu that the
  operation is executed on without any synchronization; however,
  __this_cpu_inc() doesn't and if the local cpu invokes the function
  from different contexts (e.g.  process and irq) of the same CPU, it's
  not guaranteed to actually increment as it may be implemented as rmw.

  This bug existed from the get-go but it hasn't been noticed earlier
  probably because on x86 __this_cpu_inc() is equivalent to
  this_cpu_inc() as both get translated into single instruction;
  however, s390 uses the generic rmw implementation and gets affected by
  the bug.  Kudos to Sebastian and Heiko for diagnosing it.

  The change is very low risk and fixes a critical issue on the affected
  architectures, so I think it's a good candidate for inclusion although
  it's very late in the devel cycle.  On the other hand, this has been
  broken since v3.11, so backporting it through -stable post -rc1 won't
  be the end of the world.

  I'll ping Christoph whether __this_cpu_*() ops can be better annotated
  so that it can trigger lockdep warning when used from multiple
  contexts"

* 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu-refcount: fix usage of this_cpu_ops
2014-06-04 09:56:03 -07:00
..
acpi IOMMU Upates for Linux v3.15 2014-04-05 18:46:26 -07:00
asm-generic asm-generic: remove _STK_LIM_MAX 2014-05-15 00:32:09 +01:00
clocksource
crypto
drm Merge branch 'mullins' of git://people.freedesktop.org/~deathsimple/linux into drm-fixes 2014-05-07 09:10:28 +10:00
dt-bindings 3.15 fixes for AT91 2014-04-26 11:29:30 +02:00
keys
kvm
linux Merge branch 'for-3.15-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2014-06-04 09:56:03 -07:00
math-emu
media [media] rc-core: remove generic scancode filter 2014-04-06 11:30:29 -03:00
memory
misc
net net: fix inet_getid() and ipv6_select_ident() bugs 2014-06-02 14:09:28 -07:00
pcmcia
ras
rdma Merge branches 'core', 'cxgb4', 'ip-roce', 'iser', 'misc', 'mlx4', 'nes', 'ocrdma', 'qib', 'sgwrapper', 'srp' and 'usnic' into for-next 2014-04-03 08:30:17 -07:00
rxrpc
scsi scsi: Make sure cmd_flags are 64-bit 2014-04-09 20:26:20 -06:00
sound ALSA: cs8427: separate HW initialization 2014-04-03 14:59:48 +02:00
target target/sbc: Add sbc_dif_read_strip software emulation 2014-04-07 01:48:57 -07:00
trace This contains two fixes. 2014-05-08 14:17:13 -07:00
uapi USB fixes for 3.15-rc8 2014-06-02 16:56:42 -07:00
video fbdev changes for 3.15 (OMAP) 2014-04-07 10:47:51 -07:00
xen
Kbuild