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Автор SHA1 Сообщение Дата
Linus Torvalds 513335f964 PARISC fixes on 20120607
This is a set of three bug fixes for minor build breakages that got introduced
 just before 3.5-rc1 was released.
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Merge tag 'parisc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/parisc-2.6

Pull PARISC fixes from James Bottomley:
 "This is a set of three bug fixes for minor build breakages that got
  introduced just before 3.5-rc1 was released."

* tag 'parisc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/parisc-2.6:
  [PARISC] fix code to find libgcc
  [PARISC] fix compile break in use of lib/strncopy_from_user.c
  [PARISC] fix missing TAINT_WARN problem
2012-06-07 09:06:54 -07:00
Linus Torvalds 0c30989cc9 Merge git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile
Pull tile fixes from Chris Metcalf:
 "These two minor bug fixes fix build failures from some changes that
  were merged in during the 3.5 merge window."

* git://git.kernel.org/pub/scm/linux/kernel/git/cmetcalf/linux-tile:
  tile: add #include to unbreak build after generic init_task conversion
  tile: remove cpu_idle_on_new_stack
2012-06-07 09:06:13 -07:00
Artem Bityutskiy 12027f1b3f UBI: correct ubi_wl_flush locking
Commit "62f38455 UBI: modify ubi_wl_flush function to clear work queue for a lnum"
takes the 'work_sem' semaphore in write mode for the entire loop, which is not
very good because it will block other workers for potentially long time. We do
not need to have it in write mode - read mode is enough, and we do not need to
hole it over the entire loop. So this patch turns changes the locking: takes
'work_sem' in read mode and pushes it down to the loop.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
2012-06-07 15:22:21 +03:00
Artem Bityutskiy 818039c7d5 UBIFS: fix debugfs-less systems support
Commit "f70b7e5 UBIFS: remove Kconfig debugging option" broke UBIFS and it
refuses to initialize if debugfs (CONFIG_DEBUG_FS) is disabled. I incorrectly
assumed that debugfs files creation function will return success if debugfs
is disabled, but they actually return -ENODEV. This patch fixes the issue.

Reported-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Tested-by: Paul Parsons <lost.distance@yahoo.com>
2012-06-07 10:43:54 +03:00
Artem Bityutskiy e9b4cf2094 UBI: fix debugfs-less systems support
Commit "aa44d1d UBI: remove Kconfig debugging option" broke UBI and it
refuses to initialize if debugfs (CONFIG_DEBUG_FS) is disabled. I incorrectly
assumed that debugfs files creation function will return success if debugfs
is disabled, but they actually return -ENODEV. This patch fixes the issue.

Reported-by: Paul Parsons <lost.distance@yahoo.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Tested-by: Paul Parsons <lost.distance@yahoo.com>
2012-06-07 10:43:54 +03:00
Adam Jackson 23e81d691a drm/i915: pch_irq_handler -> {ibx, cpt}_irq_handler
Cougar/Panther Point redefine the bits in SDEIIR pretty completely.
This function is just debugging, but if we're debugging we probably want
to be told accurate things instead of lies.

I'm told Lynx Point changes this yet more, but I have no idea how...

Note from Eugeni's review:

"For the record and for future enabling efforts, for LPT, bits 28-31
and 1-14 are gone since CPT/PPT (e.g., those must be zero). And there
is the bit 15 as a new addition, but we are not using it yet and
probably won't be using in foreseeable future."

Signed-off-by: Adam Jackson <ajax@redhat.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35103
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-06-06 23:01:08 +02:00
Linus Torvalds 71fae7e714 hwmon updates for 3.5-rc2
Update e-mail address in MAINTAINERS
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Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

Pull hwmon fix from Guenter Roeck:
 "Update e-mail address in MAINTAINERS"

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  MAINTAINERS: Update my e-mail address
2012-06-06 11:56:45 -07:00
Linus Torvalds ff39d0e8f0 Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux
Pull ACPI and Power Management changes from Len Brown.

This does an evil merge to fix up what I think is a mismerge by Len to
the gma500 driver, and restore it to the mainline state.

In that driver, both branches had commented out the call to
acpi_video_register(), and Len resolved the merge to that commented-out
version.

However, in mainline, further changes by Alan (commit d839ede47a56:
"gma500: opregion and ACPI" to be exact) had re-enabled the ACPI video
registration, so the current state of the driver seems to want it.

Alan is apparently still feeling the effects of partying with the Queen,
so he didn't reply to my query, but I'll do the evil merge anyway.

* 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux:
  ACPI: fix acpi_bus.h build warnings when ACPI is not enabled
  drivers: acpi: Fix dependency for ACPI_HOTPLUG_CPU
  tools/power turbostat: fix IVB support
  tools/power turbostat: fix un-intended affinity of forked program
  ACPI video: use after input_unregister_device()
  gma500: don't register the ACPI video bus
  acpi_video: Intel video is not always i915
  acpi_video: fix leaking PCI references
  ACPI: Ignore invalid _PSS entries, but use valid ones
  ACPI battery: only refresh the sysfs files when pertinent information changes
2012-06-06 10:47:15 -07:00
Linus Torvalds ae501be0f6 InfiniBand/RDMA fixes for 3.5-rc2, all in hardware drivers:
- Fix crash in cxgb4
  - Fixes to new ocrdma driver
  - Regression fixes for mlx4
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Merge tag 'rdma-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband

Pull InfiniBand/RDMA fixes from Roland Dreier:
 "All in hardware drivers:
   - Fix crash in cxgb4
   - Fixes to new ocrdma driver
   - Regression fixes for mlx4"

* tag 'rdma-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband:
  IB/mlx4: Fix max_wqe capacity reported from query device
  mlx4_core: Fix setting VL_cap in mlx4_SET_PORT wrapper flow
  IB/mlx4: Fix EQ deallocation in legacy mode
  RDMA/cxgb4: Fix crash when peer address is 0.0.0.0
  RDMA/ocrdma: Remove unnecessary version.h includes
  RDMA/ocrdma: Fix signaled event for SRQ_LIMIT_REACHED
  RDMA/ocrdma: Correct queue free count math
2012-06-06 10:45:21 -07:00
Roland Dreier 20952cdd8e Merge branches 'cxgb4', 'mlx4' and 'ocrdma' into for-linus 2012-06-06 10:08:11 -07:00
Sagi Grimberg fc2d004419 IB/mlx4: Fix max_wqe capacity reported from query device
1. Limit the max number of WQEs per QP reported when querying the
   device, so that ib_create_qp() will not fail for a QP size that the
   device claimed to support due to additional headroom WQEs being
   allocated.

2. Limit qp resources accepted for ib_create_qp() to the limits
   reported in ib_query_device().  In kernel space, make sure that the
   limits returned to the caller following qp creation also lie within
   the reported device limits. For userspace, report as before, and do
   adjustment in libmlx4 (so as not to break ABI).

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Sagi Grimberg <sagig@mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
2012-06-06 10:08:03 -07:00
Jack Morgenstein edc4a67e15 mlx4_core: Fix setting VL_cap in mlx4_SET_PORT wrapper flow
Commit 096335b3f9 ("mlx4_core: Allow dynamic MTU configuration for
IB ports") modifies the port VL setting.  This exposes a bug in
mlx4_common_set_port(), where the VL cap value passed in (inside the
command mailbox) is incorrectly zeroed-out:

mlx4_SET_PORT modifies the VL_cap field (byte 3 of the mailbox).
Since the SET_PORT command is paravirtualized on the master as well as
on the slaves, mlx4_SET_PORT_wrapper() is invoked on the master.  This
calls mlx4_common_set_port() where mailbox byte 3 gets overwritten by
code which should only set a single bit in that byte (for the reset
qkey counter flag) -- but instead overwrites the entire byte.

The result is that when running in SR-IOV mode, the VL_cap will be set
to zero -- fix this.

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
2012-06-06 10:07:54 -07:00
Linus Torvalds 374916ed16 md: 2 fixes for 3.5-rc
One sparse-warning fix, one bigfix for 3.4-stable
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Merge tag 'md-3.5-fixes' of git://neil.brown.name/md

Pull two md fixes from NeilBrown:
 "One sparse-warning fix, one bugfix for 3.4-stable"

* tag 'md-3.5-fixes' of git://neil.brown.name/md:
  md: raid1/raid10: fix problem with merge_bvec_fn
  lib/raid6: fix sparse warnings in recovery functions
2012-06-06 09:49:28 -07:00
Linus Torvalds 9e68447f5b IOMMU fixes for v3.5-rc1
Two patches are in here which fix AMD IOMMU specific issues. One patch
 fixes a long-standing warning on resume because the amd_iommu_resume
 function enabled interrupts. The other patch fixes a deadlock in an
 error-path of the page-fault request handling code of the IOMMU driver.
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Merge tag 'iommu-fixes-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull IOMMU fixes from Joerg Roedel:
 "Two patches are in here which fix AMD IOMMU specific issues.  One
  patch fixes a long-standing warning on resume because the
  amd_iommu_resume function enabled interrupts.  The other patch fixes a
  deadlock in an error-path of the page-fault request handling code of
  the IOMMU driver.

* tag 'iommu-fixes-3.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/amd: Fix deadlock in ppr-handling error path
  iommu/amd: Cache pdev pointer to root-bridge
2012-06-06 09:47:57 -07:00
Chris Metcalf 2ded5c2484 tile: add #include to unbreak build after generic init_task conversion
Some code was moved from init_task.c to setup.c but the appropriate
header needed to be moved as well.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-06-06 11:29:35 -04:00
Chris Metcalf 10db9e009a tile: remove cpu_idle_on_new_stack
This routine isn't used unless CONFIG_HOMECACHE is enabled, which
isn't even available as a public configuration option yet.
Since it no longer links correctly in 3.4, just remove it for now.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
2012-06-06 11:29:31 -04:00
Arun Sharma db0dc75d64 perf/x86: Check user address explicitly in copy_from_user_nmi()
Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1334961696-19580-5-git-send-email-asharma@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 17:08:04 +02:00
Arun Sharma bc6ca7b342 perf/x86: Check if user fp is valid
Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1334961696-19580-4-git-send-email-asharma@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 17:08:01 +02:00
Arun Sharma 0b0d9cf6ec perf: Limit callchains to 127
Stack depth of 255 seems excessive, given that copy_from_user_nmi()
could be slow.

Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1334961696-19580-3-git-send-email-asharma@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 17:08:00 +02:00
Arun Sharma 302fa4b58a perf/x86: Allow multiple stacks
Without this patch, applications with two different stack
regions (eg: native stack vs JIT stack) get truncated
callchains even when RBP chaining is present. GDB shows proper
stack traces and the frame pointer chaining is intact.

This patch disables the (fp < RSP) check, hoping that other checks
in the code save the day for us. In our limited testing, this
didn't seem to break anything.

In the long term, we could potentially have userspace advise
the kernel on the range of valid stack addresses, so we don't
spend a lot of time unwinding from bogus addresses.

Signed-off-by: Arun Sharma <asharma@fb.com>
CC: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-perf-users@vger.kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1334961696-19580-2-git-send-email-asharma@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 17:07:58 +02:00
Dimitri Sivanich a841f8cef4 sched: Fix the relax_domain_level boot parameter
It does not get processed because sched_domain_level_max is 0 at the
time that setup_relax_domain_level() is run.

Simply accept the value as it is, as we don't know the value of
sched_domain_level_max until sched domain construction is completed.

Fix sched_relax_domain_level in cpuset.  The build_sched_domain() routine calls
the set_domain_attribute() routine prior to setting the sd->level, however,
the set_domain_attribute() routine relies on the sd->level to decide whether
idle load balancing will be off/on.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120605184436.GA15668@sgi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 17:07:41 +02:00
Eugeni Dodonov 67384fe3fd char/agp: add another Ironlake host bridge
This seems to come on Gigabyte H55M-S2V and was discovered through the
https://bugs.freedesktop.org/show_bug.cgi?id=50381 debugging.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50381
Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-06-06 17:05:29 +02:00
Peter Zijlstra 8440ccb43f perf/x86: Update SNB PEBS constraints
Afaict there's no need to (incompletely) iterate the
MEM_UOPS_RETIRED.* umask state.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1338884803.28282.153.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:59:52 +02:00
Peter Zijlstra b6db437ba8 perf/x86: Enable/Add IvyBridge hardware support
Implement rudimentary IVB perf support. The SDM states its identical
to SNB with exception of the exact event tables, but a quick look
suggests they're similar enough.

Also mark SNB-EP as broken for now.

Requested-and-tested-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1338884803.28282.153.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:59:49 +02:00
Peter Zijlstra cccb9ba9e4 perf/x86: Implement cycles:p for SNB/IVB
Now that there's finally a chip with working PEBS (IvyBridge), we can
enable the hardware and implement cycles:p for SNB/IVB.

Cc: Stephane Eranian <eranian@google.com>
Requested-and-tested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1338884803.28282.153.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:59:47 +02:00
Peter Zijlstra b430f7c470 perf/x86: Fix Intel shared extra MSR allocation
Zheng Yan reported that event group validation can wreck event state
when Intel extra_reg allocation changes event state.

Validation shouldn't change any persistent state. Cloning events in
validate_{event,group}() isn't really pretty either, so add a few
special cases to avoid modifying the event state.

The code is restructured to minimize the special case impact.

Reported-by: Zheng Yan <zheng.z.yan@linux.intel.com>
Acked-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1338903031.28282.175.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:59:44 +02:00
Peter Zijlstra d039ac6080 sched: Validate assumptions in sched_init_numa()
Add some code to validate assumptions we're making and output
warnings if they are not.

If this trigger we want to know about it.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Alex Shi <lkml.alex@gmail.com>
Link: http://lkml.kernel.org/n/tip-6uc3wk5s9udxtdl9cnku0vtt@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:52:30 +02:00
Peter Zijlstra c3decf0dfb sched: Always initialize cpu-power
Often when we run into mis-shapen topologies the balance iteration
fails to update the cpu power properly and we'll end up in /0 traps.

Always initialize the cpu-power to a semi-sane value so that we can
at least boot the machine, even if the load-balancer might not
function correctly.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-3lbhyj25sr169ha7z3qht5na@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:52:27 +02:00
Peter Zijlstra c117487687 sched: Fix domain iteration
Weird topologies can lead to asymmetric domain setups. This needs
further consideration since these setups are typically non-minimal
too.

For now, make it work by adding an extra mask selecting which CPUs
are allowed to iterate up.

The topology that triggered it is the one from David Rientjes:

	10 20 20 30
	20 10 20 20
	20 20 10 20
	30 20 20 10

resulting in boxes that wouldn't even boot.

Reported-by: David Rientjes <rientjes@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-3p86l9cuaqnxz7uxsojmz5rm@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:52:26 +02:00
Peter Zijlstra 7f1b43936f sched/rt: Fix lockdep annotation within find_lock_lowest_rq()
Roland Dreier reported spurious, hard to trigger lockdep warnings
within the scheduler - without any real lockup.

This bit gives us the right clue:

> [89945.640512]  [<ffffffff8103fa1a>] double_lock_balance+0x5a/0x90
> [89945.640568]  [<ffffffff8104c546>] push_rt_task+0xc6/0x290

if you look at that code you'll find the double_lock_balance() in
question is the one in find_lock_lowest_rq() [yay for inlining].

Now find_lock_lowest_rq() has a bug.. it fails to use
double_unlock_balance() in one exit path, if this results in a retry in
push_rt_task() we'll call double_lock_balance() again, at which point
we'll run into said lockdep confusion.

Reported-by: Roland Dreier <roland@kernel.org>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1337282386.4281.77.camel@twins
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:52:26 +02:00
Alex Shi 10717dcde1 sched/numa: Load balance between remote nodes
Commit cb83b629b ("sched/numa: Rewrite the CONFIG_NUMA sched
domain support") removed the NODE sched domain and started checking
if the node distance in SLIT table is farther than REMOTE_DISTANCE,
if so, it will lose the load balance chance at exec/fork/wake_affine
points.

But actually, even the node distance is farther than REMOTE_DISTANCE.

Modern CPUs also has QPI like connections, which ensures that memory
access is not too slow between nodes. So the above change in behavior
on NUMA machine causes a performance regression on various benchmarks:
hackbench, tbench, netperf, oltp, etc.

This patch will recover the scheduler behavior to old mode on all my
Intel platforms: NHM EP/EX, WSM EP, SNB EP/EP4S, and thus fixes the
perfromance regressions. (all of them just have 2 kinds distance, 10, 21)

Signed-off-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1338965571-9812-1-git-send-email-alex.shi@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:52:25 +02:00
Kamalesh Babulal ceb1cbac8e sched/x86: Calculate booted cores after construction of sibling_mask
Commit 316ad24830 ("sched/x86: Rewrite set_cpu_sibling_map()")
broke the booted_cores accounting.

The problem is that the booted_cores accounting needs all the
sibling links set up. So restore the second loop and add a comment as
to why its needed.

On qemu booted with -smp sockets=1,cores=2,threads=2;
Before:
 $ grep cores /proc/cpuinfo
 cpu cores       : 2
 cpu cores       : 1
 cpu cores       : 4
 cpu cores       : 3

With the patch:
 $ grep cores /proc/cpuinfo
 cpu cores       : 2
 cpu cores       : 2
 cpu cores       : 2
 cpu cores       : 2

Reported-by: Prarit Bhargava <prarit@redhat.com>
Reported-by: Borislav Petkov <bp@amd64.org>
Signed-off-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120531073738.GH7511@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 16:37:59 +02:00
Tomoki Sekiyama f6175f5bfb x86/ioapic: Fix NULL pointer dereference on CPU hotplug after disabling irqs
In current Linux, percpu variable `vector_irq' is not cleared on
offlined cpus while disabling devices' irqs. If the cpu that has
the disabled irqs in vector_irq is hotplugged,
__setup_vector_irq() hits invalid irq vector and may crash.

This bug can be reproduced as following;

  # echo 0 > /sys/devices/system/cpu/cpu7/online
  # modprobe -r some_driver_using_interrupts      # vector_irq@cpu7 uncleared
  # echo 1 > /sys/devices/system/cpu/cpu7/online  # kernel may crash

This patch fixes this bug by clearing vector_irq in
__clear_irq_vector() even if the cpu is offlined.

Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama.qu@hitachi.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: yrl.pp-manager.tt@hitachi.com
Cc: ltc-kernel@ml.yrl.intra.hitachi.co.jp
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Alexander Gordeev <agordeev@redhat.com>
Link: http://lkml.kernel.org/r/4FC340BE.7080101@hitachi.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 12:03:25 +02:00
Feng Tang 55c844a4dd x86/reboot: Fix a warning message triggered by stop_other_cpus()
When rebooting our 24 CPU Westmere servers with 3.4-rc6, we
always see this warning msg:

Restarting system.
machine restart
------------[ cut here ]------------
WARNING: at arch/x86/kernel/smp.c:125
native_smp_send_reschedule+0x74/0xa7() Hardware name: X8DTN
Modules linked in: igb [last unloaded: scsi_wait_scan]
Pid: 1, comm: systemd-shutdow Not tainted 3.4.0-rc6+ #22
Call Trace:
 <IRQ>  [<ffffffff8102a41f>] warn_slowpath_common+0x7e/0x96
 [<ffffffff8102a44c>] warn_slowpath_null+0x15/0x17
 [<ffffffff81018cf7>] native_smp_send_reschedule+0x74/0xa7
 [<ffffffff810561c1>] trigger_load_balance+0x279/0x2a6
 [<ffffffff81050112>] scheduler_tick+0xe0/0xe9
 [<ffffffff81036768>] update_process_times+0x60/0x70
 [<ffffffff81062f2f>] tick_sched_timer+0x68/0x92
 [<ffffffff81046e33>] __run_hrtimer+0xb3/0x13c
 [<ffffffff81062ec7>] ? tick_nohz_handler+0xd0/0xd0
 [<ffffffff810474f2>] hrtimer_interrupt+0xdb/0x198
 [<ffffffff81019a35>] smp_apic_timer_interrupt+0x81/0x94
 [<ffffffff81655187>] apic_timer_interrupt+0x67/0x70
 <EOI>  [<ffffffff8101a3c4>] ? default_send_IPI_mask_allbutself_phys+0xb4/0xc4
 [<ffffffff8101c680>] physflat_send_IPI_allbutself+0x12/0x14
 [<ffffffff81018db4>] native_nmi_stop_other_cpus+0x8a/0xd6
 [<ffffffff810188ba>] native_machine_shutdown+0x50/0x67
 [<ffffffff81018926>] machine_shutdown+0xa/0xc
 [<ffffffff8101897e>] native_machine_restart+0x20/0x32
 [<ffffffff810189b0>] machine_restart+0xa/0xc
 [<ffffffff8103b196>] kernel_restart+0x47/0x4c
 [<ffffffff8103b2e6>] sys_reboot+0x13e/0x17c
 [<ffffffff8164e436>] ? _raw_spin_unlock_bh+0x10/0x12
 [<ffffffff810fcac9>] ? bdi_queue_work+0xcf/0xd8
 [<ffffffff810fe82f>] ? __bdi_start_writeback+0xae/0xb7
 [<ffffffff810e0d64>] ? iterate_supers+0xa3/0xb7
 [<ffffffff816547a2>] system_call_fastpath+0x16/0x1b
---[ end trace 320af5cb1cb60c5b ]---

The root cause seems to be the
default_send_IPI_mask_allbutself_phys() takes quite some time (I
measured it could be several ms) to complete sending NMIs to all
the other 23 CPUs, and for HZ=250/1000 system, the time is long
enough for a timer interrupt to happen, which will in turn
trigger to kick load balance to a stopped CPU and cause this
warning in native_smp_send_reschedule().

So disabling the local irq before stop_other_cpu() can fix this
problem (tested 25 times reboot ok), and it is fine as there
should be nobody caring the timer interrupt in such reboot
stage.

The latest 3.4 kernel slightly changes this behavior by sending
REBOOT_VECTOR first and only send NMI_VECTOR if the REBOOT_VCTOR
fails, and this patch is still needed to prevent the problem.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Don Zickus <dzickus@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20120530231541.4c13433a@feng-i7
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 12:03:23 +02:00
Sebastian Andrzej Siewior 7071f6b288 x86/intel/moorestown: Change intel_scu_devices_create() to __devinit
The allmodconfig hits:

 WARNING: vmlinux.o(.text+0x6553d): Section mismatch in
          reference from the function intel_scu_devices_create() to the
          function .devinit.text: spi_register_board_info()
	  [...]

This patch marks intel_scu_devices_create() as devinit because
it only calls a devinit function, spi_register_board_info().

Signed-off-by: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Samuel Ortiz <sameo@linux.intel.com>
Cc: Feng Tang <feng.tang@intel.com>
Link: http://lkml.kernel.org/r/20120531212025.GA8519@breakpoint.cc
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 11:58:40 +02:00
Yasuaki Ishimatsu 4af463d28f x86/numa: Set numa_nodes_parsed at acpi_numa_memory_affinity_init()
When hot-adding a CPU, the system outputs following messages
since node_to_cpumask_map[2] was not allocated memory.

Booting Node 2 Processor 32 APIC 0xc0
node_to_cpumask_map[2] NULL
Pid: 0, comm: swapper/32 Tainted: G       A     3.3.5-acd #21
Call Trace:
 [<ffffffff81048845>] debug_cpumask_set_cpu+0x155/0x160
 [<ffffffff8105e28a>] ? add_timer_on+0xaa/0x120
 [<ffffffff8150665f>] numa_add_cpu+0x1e/0x22
 [<ffffffff815020bb>] identify_cpu+0x1df/0x1e4
 [<ffffffff815020d6>] identify_econdary_cpu+0x16/0x1d
 [<ffffffff81504614>] smp_store_cpu_info+0x3c/0x3e
 [<ffffffff81505263>] smp_callin+0x139/0x1be
 [<ffffffff815052fb>] start_secondary+0x13/0xeb

The reason is that the bit of node 2 was not set at
numa_nodes_parsed. numa_nodes_parsed is set by only
acpi_numa_processor_affinity_init /
acpi_numa_x2apic_affinity_init. Thus even if hot-added memory
which is same PXM as hot-added CPU is written in ACPI SRAT
Table, if the hot-added CPU is not written in ACPI SRAT table,
numa_nodes_parsed is not set.

But according to ACPI Spec Rev 5.0, it says about ACPI SRAT
table as follows: This optional table provides information that
allows OSPM to associate processors and memory ranges, including
ranges of memory provided by hot-added memory devices, with
system localities / proximity domains and clock domains.

It means that ACPI SRAT table only provides information for CPUs
present at boot time and for memory including hot-added memory.
So hot-added memory is written in ACPI SRAT table, but hot-added
CPU is not written in it. Thus numa_nodes_parsed should be set
by not only acpi_numa_processor_affinity_init /
acpi_numa_x2apic_affinity_init but also
acpi_numa_memory_affinity_init for the case.

Additionally, if system has cpuless memory node,
acpi_numa_processor_affinity_init /
acpi_numa_x2apic_affinity_init cannot set numa_nodes_parseds
since these functions cannot find cpu description for the node.
In this case, numa_nodes_parsed needs to be set by
acpi_numa_memory_affinity_init.

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: liuj97@gmail.com
Cc: kosaki.motohiro@gmail.com
Link: http://lkml.kernel.org/r/4FCC2098.4030007@jp.fujitsu.com
[ merged it ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 11:58:39 +02:00
Xiaotian Feng aff5a62d52 x86/gart: Fix kmemleak warning
aperture_64.c now is using memblock, the previous
kmemleak_ignore() for alloc_bootmem() should be removed then.

Otherwise, with kmemleak enabled, kernel will throw warnings
like:

[    0.000000] kmemleak: Trying to color unknown object at 0xffff8800c4000000 as Black
[    0.000000] Pid: 0, comm: swapper/0 Not tainted 3.5.0-rc1-next-20120605+ #130
[    0.000000] Call Trace:
[    0.000000]  [<ffffffff811b27e6>] paint_ptr+0x66/0xc0
[    0.000000]  [<ffffffff816b90fb>] kmemleak_ignore+0x2b/0x60
[    0.000000]  [<ffffffff81ef7bc0>] kmemleak_init+0x217/0x2c1
[    0.000000]  [<ffffffff81ed2b97>] start_kernel+0x32d/0x3eb
[    0.000000]  [<ffffffff81ed25e4>] ? repair_env_string+0x5a/0x5a
[    0.000000]  [<ffffffff81ed2356>] x86_64_start_reservations+0x131/0x135
[    0.000000]  [<ffffffff81ed2120>] ? early_idt_handlers+0x120/0x120
[    0.000000]  [<ffffffff81ed245c>] x86_64_start_kernel+0x102/0x111
[    0.000000] kmemleak: Early log backtrace:
[    0.000000]    [<ffffffff816b911b>] kmemleak_ignore+0x4b/0x60
[    0.000000]    [<ffffffff81ee6a38>] gart_iommu_hole_init+0x3e7/0x547
[    0.000000]    [<ffffffff81edb20b>] pci_iommu_alloc+0x44/0x6f
[    0.000000]    [<ffffffff81ee81ad>] mem_init+0x19/0xec
[    0.000000]    [<ffffffff81ed2a54>] start_kernel+0x1ea/0x3eb
[    0.000000]    [<ffffffff81ed2356>] x86_64_start_reservations+0x131/0x135
[    0.000000]    [<ffffffff81ed245c>] x86_64_start_kernel+0x102/0x111
[    0.000000]    [<ffffffffffffffff>] 0xffffffffffffffff

Signed-off-by: Xiaotian Feng <dannyfeng@tencent.com>
Cc: Xiaotian Feng <xtfeng@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1338922831-2847-1-git-send-email-xtfeng@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 11:58:38 +02:00
Thomas Gleixner 1a87fc1ec7 x86: mce: Add the dropped timer interval init back
commit 82f7af09 ("x86/mce: Cleanup timer mess) dropped the
initialization of the per cpu timer interval. Duh :(

Restore the previous behaviour.

Reported-by: Chen Gong <gong.chen@linux.intel.com>
Cc: bp@amd64.org
Cc: tony.luck@intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2012-06-06 11:33:21 +02:00
Masami Hiramatsu 436d03faf6 x86/decoder: Fix bsr/bsf/jmpe decoding with operand-size prefix
Fix the x86 instruction decoder to decode bsr/bsf/jmpe with
operand-size prefix (66h). This fixes the test case failure
reported by Linus, attached below.

bsf/bsr/jmpe have a special encoding. Opcode map in
Intel Software Developers Manual vol2 says they have
TZCNT/LZCNT variants if it has F3h prefix. However, there
is no information if it has other 66h or F2h prefixes.
Current instruction decoder supposes that those are
bad instructions, but it actually accepts at least
operand-size prefixes.

H. Peter Anvin further explains:

 " TZCNT/LZCNT are F3 + BSF/BSR exactly because the F2 and
   F3 prefixes have historically been no-ops with most instructions.
   This allows software to unconditionally use the prefixed versions
   and get TZCNT/LZCNT on the processors that have them if they don't
   care about the difference. "

This fixes errors reported by test_get_len:

  Warning: arch/x86/tools/test_get_len found difference at <em_bsf>:ffffffff81036d87
  Warning: ffffffff81036de5:	66 0f bc c2          	bsf    %dx,%ax
  Warning: objdump says 4 bytes, but insn_get_length() says 3
  Warning: arch/x86/tools/test_get_len found difference at <em_bsr>:ffffffff81036ea6
  Warning: ffffffff81036f04:	66 0f bd c2          	bsr    %dx,%ax
  Warning: objdump says 4 bytes, but insn_get_length() says 3
  Warning: decoded and checked 13298882 instructions with 2 warnings

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: <yrl.pp-manager.tt@hitachi.com>
Link: http://lkml.kernel.org/r/20120604150911.22338.43296.stgit@localhost.localdomain
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 08:54:18 +02:00
Ingo Molnar 02e03040a3 Merge tag 'perf-urgent-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
Pull perf fixes from Arnaldo Carvalho de Melo:

 * Endianness fixes from Jiri Olsa

 * Fixes for make perf tarball

 * Fix for DSO name in perf script callchains, from David Ahern

 * Segfault fixes for perf top --callchain, from Namhyung Kim

 * Minor function result fixes from Srikar Dronamraju

 * Add missing 3rd ioctl parameter, from Namhyung Kim

 * Fix pager usage in minimal embedded systems, from Avik Sil

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 08:46:33 +02:00
Chen Gong 958fb3c512 x86/mce: Fix the MCE poll timer logic
In commit 82f7af09 ("x86/mce: Cleanup timer mess), Thomas just
forgot the "/ 2" there while cleaning up.

Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: bp@amd64.org
Cc: tony.luck@intel.com
Link: http://lkml.kernel.org/r/1338863702-9245-1-git-send-email-gong.chen@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2012-06-06 08:28:21 +02:00
Linus Torvalds eea5b5510f Typo/thinko in a cleanup caused a semantic change. Fix it.
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Merge tag 'please-pull-mce' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras

Pull MCE regression fix from Tony Luck:
 "Typo/thinko in a cleanup caused a semantic change. Fix it."

* tag 'please-pull-mce' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras:
  x86/mce: Fix the MCE poll timer logic
2012-06-05 15:15:04 -07:00
Linus Torvalds ecc728467f Merge branch 'fixes-for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping
Pull arm CMA fix from Marek Szyprowski:
 "This removes the ARMv6+ CMA dependency and lets one use old, well-
  tested dma-mapping implementation also on ARMv6+ systems without the
  need to use EXPERIMENTAL stuff."

Russell King complained (rightly) about the experimental feature being
forced on by the ARM config.

Here CMA is "continuous memory allocator", not "cross-memory attach".
We really neet to stop using insane TLA's for things that aren't big
industry standards.

* 'fixes-for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping:
  ARM: dma-mapping: remove unconditional dependency on CMA
2012-06-05 13:23:17 -07:00
Bryan Wu aa69cb8c1e MAINTAINERS: add linux-leds mail list address and git URL
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-05 12:50:54 -07:00
Daniel Vetter cb05d8dede drm/i915: fix up ivb plane 3 pageflips
Or at least plug another gapping hole. Apparrently hw desingers only
moved the bit field, but did not bother ot re-enumerate the planes
when adding support for a 3rd pipe.

Discovered by i-g-t/flip_test.

This may or may not fix the reference bugzilla, because that one
smells like we have still larger fish to fry.

v2: Fixup the impossible case to catch programming errors, noticed by
Chris Wilson.

References: https://bugs.freedesktop.org/show_bug.cgi?id=50069
Acked-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Eugeni Dodonov <eugeni.dodonov@intel.com>
Cc: stable@vger.kernel.org
Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2012-06-05 21:05:21 +02:00
Karel Zak 256cccbeca MAINTAINERS: update util-linux info
Signed-off-by: Karel Zak <kzak@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-06-05 11:57:31 -07:00
Linus Torvalds 5f73639c63 Merge branch '3.5-merge-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
Pull two scsi target fixes from Nicholas Bellinger:
 "The first is a small name-space collision fix from Stefan for the new
  sbp-target / ieee-1394 code, and second is the FILEIO backend
  conversion patch to always use O_DSYNC by default instead of O_SYNC as
  recommended by hch.  Note the latter is CC'ed stable."

* '3.5-merge-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  target/file: Use O_DSYNC by default for FILEIO backends
  sbp-target: rename a variable to avoid name clash
2012-06-05 11:55:27 -07:00
Linus Torvalds 365f0e173f Merge branch 'for-3.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
Pull cgroup fix from Tejun Heo:
 "This fixes the possible premature superblock release on umount bug
  mentioned during v3.5-rc1 pull request.

  Originally, cgroup dentry destruction path assumed that cgroup dentry
  didn't have any reference left after cgroup removal thus put super
  during dentry removal.  Now that there can be lingering dentry
  references, this led to super being put with live dentries.  This
  patch fixes the problem by putting super ref on dentry release instead
  of removal."

* 'for-3.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: superblock can't be released with active dentries
2012-06-05 11:54:12 -07:00
Linus Torvalds 690efa08e2 Merge branch 'i2c-embedded/for-current' of git://git.pengutronix.de/git/wsa/linux
Pull embedded i2c update from Wolfram Sang:
 "This only contains one new driver which had multiple dependencies
  (pinctrl, i2c-mux-rework, new devm_* functions), so I decided to wait
  for rc1.  Plus, it had to wait a little for the ack of a devicetree
  maintainer since the bindings were not trivial enough for me to pass
  through.

  So, given that, I hope there is still something like the "new driver
  rule", so we could have the driver in 3.5 and people can start using
  it.  That would make merging support for some boards easier for 3.6
  since the dependency on this driver is gone then."

* 'i2c-embedded/for-current' of git://git.pengutronix.de/git/wsa/linux:
  i2c: Add generic I2C multiplexer using pinctrl API
2012-06-05 10:55:31 -07:00
Linus Torvalds 5698e9180c Merge git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fix from Avi Kivity:
 "A one-liner fix for a buffer overflow"

* git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: Fix buffer overflow in kvm_set_irq()
2012-06-05 10:54:30 -07:00