1. 22 Feb, 2012 6 commits
    • Peter Zijlstra's avatar
      sched/events: Revert trace_sched_stat_sleeptime() · 8c79a045
      Peter Zijlstra authored
      Commit 1ac9bc69 ("sched/tracing: Add a new tracepoint for sleeptime")
      added a new sched:sched_stat_sleeptime tracepoint.
      
      It's broken: the first sample we get on a task might be bad because
      of a stale sleep_start value that wasn't reset at the last task switch
      because the tracepoint was not active.
      
      It also breaks the existing schedstat samples due to the side
      effects of:
      
      -               se->statistics.sleep_start = 0;
      ...
      -               se->statistics.block_start = 0;
      
      Nor do I see means to fix it without adding overhead to the scheduler
      fast path, which I'm not willing to for the sake of redundant
      instrumentation.
      
      Most importantly, sleep time information can already be constructed
      by tracing context switches and wakeups, and taking the timestamp
      difference between the schedule-out, the wakeup and the schedule-in.
      Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: Andrew Vagin <avagin@openvz.org>
      Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Link: http://lkml.kernel.org/n/tip-pc4c9qhl8q6vg3bs4j6k0rbd@git.kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@elte.hu>
      8c79a045
    • Linus Torvalds's avatar
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm · 6b0d1abb
      Linus Torvalds authored
      A few more things this time around.  The only thing warranting some
      commentry is the modpost change, which allows folk building a Thumb2
      enabled kernel to see section mismatch warnings.  This is why many
      weren't noticed with OMAP.
      
      * 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
        ARM/audit: include audit header and fix audit arch
        ARM: OMAP: fix voltage domain build errors with PM_OPP disabled
        ARM/PCI: Remove ARM's duplicate definition of 'pcibios_max_latency'
        ARM: 7336/1: smp_twd: Don't register CPUFREQ notifiers if local timers are not initialised
        ARM: 7327/1: need to include asm/system.h in asm/processor.h
        ARM: 7326/2: PL330: fix null pointer dereference in pl330_chan_ctrl()
        ARM: 7164/3: PL330: Fix the size of the dst_cache_ctrl field
        ARM: 7325/1: fix v7 boot with lockdep enabled
        ARM: 7324/1: modpost: Fix section warnings for ARM for many compilers
        ARM: 7323/1: Do not allow ARM_LPAE on pre-ARMv7 architectures
      6b0d1abb
    • James Morris's avatar
      maintainers: update my email address · 9b45c0d2
      James Morris authored
      Update my email address.
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      9b45c0d2
    • Linus Torvalds's avatar
      sys_poll: fix incorrect type for 'timeout' parameter · faf30900
      Linus Torvalds authored
      The 'poll()' system call timeout parameter is supposed to be 'int', not
      'long'.
      
      Now, the reason this matters is that right now 32-bit compat mode is
      broken on at least x86-64, because the 32-bit code just calls
      'sys_poll()' directly on x86-64, and the 32-bit argument will have been
      zero-extended, turning a signed 'int' into a large unsigned 'long'
      value.
      
      We could just introduce a 'compat_sys_poll()' function for this, and
      that may eventually be what we have to do, but since the actual standard
      poll() semantics is *supposed* to be 'int', and since at least on x86-64
      glibc sign-extends the argument before invocing the system call (so
      nobody can actually use a 64-bit timeout value in user space _anyway_,
      even in 64-bit binaries), the simpler solution would seem to be to just
      fix the definition of the system call to match what it should have been
      from the very start.
      
      If it turns out that somebody somehow circumvents the user-level libc
      64-bit sign extension and actually uses a large unsigned 64-bit timeout
      despite that not being how poll() is supposed to work, we will need to
      do the compat_sys_poll() approach.
      Reported-by: default avatarThomas Meyer <thomas@m3y3r.de>
      Acked-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      faf30900
    • Hitoshi Mitake's avatar
      asm-generic: architecture independent readq/writeq for 32bit environment · 797a796a
      Hitoshi Mitake authored
      This provides unified readq()/writeq() helper functions for 32-bit
      drivers.
      
      For some cases, readq/writeq without atomicity is harmful, and order of
      io access has to be specified explicitly.  So in this patch, new two
      header files which contain non-atomic readq/writeq are added.
      
       - <asm-generic/io-64-nonatomic-lo-hi.h> provides non-atomic readq/
         writeq with the order of lower address -> higher address
      
       - <asm-generic/io-64-nonatomic-hi-lo.h> provides non-atomic readq/
         writeq with reversed order
      
      This allows us to remove some readq()s that were added drivers when the
      default non-atomic ones were removed in commit dbee8a0a ("x86:
      remove 32-bit versions of readq()/writeq()")
      
      The drivers which need readq/writeq but can do with the non-atomic ones
      must add the line:
      
        #include <asm-generic/io-64-nonatomic-lo-hi.h> /* or hi-lo.h */
      
      But this will be nop in 64-bit environments, and no other #ifdefs are
      required.  So I believe that this patch can solve the problem of
       1. driver-specific readq/writeq
       2. atomicity and order of io access
      
      This patch is tested with building allyesconfig and allmodconfig as
      ARCH=x86 and ARCH=i386 on top of tip/master.
      
      Cc: Kashyap Desai <Kashyap.Desai@lsi.com>
      Cc: Len Brown <lenb@kernel.org>
      Cc: Ravi Anand <ravi.anand@qlogic.com>
      Cc: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
      Cc: Matthew Garrett <mjg@redhat.com>
      Cc: Jason Uhlenkott <juhlenko@akamai.com>
      Cc: James Bottomley <James.Bottomley@parallels.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Roland Dreier <roland@purestorage.com>
      Cc: James Bottomley <jbottomley@parallels.com>
      Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
      Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarHitoshi Mitake <h.mitake@gmail.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      797a796a
  2. 21 Feb, 2012 8 commits
    • Eric Paris's avatar
      ARM/audit: include audit header and fix audit arch · 5180bb39
      Eric Paris authored
      Both bugs being fixed were introduced in:
      29ef73b7
      
      Include linux/audit.h to fix below build errors:
      
        CC      arch/arm/kernel/ptrace.o
      arch/arm/kernel/ptrace.c: In function 'syscall_trace':
      arch/arm/kernel/ptrace.c:919: error: implicit declaration of function 'audit_syscall_exit'
      arch/arm/kernel/ptrace.c:921: error: implicit declaration of function 'audit_syscall_entry'
      arch/arm/kernel/ptrace.c:921: error: 'AUDIT_ARCH_ARMEB' undeclared (first use in this function)
      arch/arm/kernel/ptrace.c:921: error: (Each undeclared identifier is reported only once
      arch/arm/kernel/ptrace.c:921: error: for each function it appears in.)
      make[1]: *** [arch/arm/kernel/ptrace.o] Error 1
      make: *** [arch/arm/kernel] Error 2
      
      This part of the patch is:
      Reported-by: default avatarAxel Lin <axel.lin@gmail.com>
      Reported-by: default avatarPeter Ujfalusi <peter.ujfalusi@ti.com>
      (They both provided patches to fix it)
      
      This patch also (at the request of the list) fixes the fact that
      ARM has both LE and BE versions however the audit code was called as if
      it was always BE.  If audit userspace were to try to interpret the bits
      it got from a LE system it would obviously do so incorrectly.  Fix this
      by using the right arch flag on the right system.
      
      This part of the patch is:
      Reported-by: default avatarRussell King - ARM Linux <linux@arm.linux.org.uk>
      Signed-off-by: default avatarEric Paris <eparis@redhat.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      5180bb39
    • Russell King's avatar
      ARM: OMAP: fix voltage domain build errors with PM_OPP disabled · 3ddd4d0c
      Russell King authored
      The voltage domain code wants the voltage tables, which are in the
      opp*.c files.  These files aren't built when PM_OPP is disabled,
      causing the following build errors at link time:
      
      twl-common.c:(.init.text+0x2e48): undefined reference to `omap34xx_vddmpu_volt_data'
      twl-common.c:(.init.text+0x2e4c): undefined reference to `omap34xx_vddcore_volt_data'
      twl-common.c:(.init.text+0x2e5c): undefined reference to `omap36xx_vddmpu_volt_data'
      twl-common.c:(.init.text+0x2e60): undefined reference to `omap36xx_vddcore_volt_data'
      twl-common.c:(.init.text+0x2830): undefined reference to `omap44xx_vdd_mpu_volt_data'
      twl-common.c:(.init.text+0x283c): undefined reference to `omap44xx_vdd_iva_volt_data'
      twl-common.c:(.init.text+0x2844): undefined reference to `omap44xx_vdd_core_volt_data'
      Acked-by: default avatarKevin Hilman <khilman@ti.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      3ddd4d0c
    • Myron Stowe's avatar
      ARM/PCI: Remove ARM's duplicate definition of 'pcibios_max_latency' · e23e8c06
      Myron Stowe authored
      The patch series to re-factor PCI's 'latency timer' setup (re:
      http://marc.info/?l=linux-kernel&m=131983853831049&w=2) forgot to
      remove the ARM specific definition of 'pcibios_max_latency' once such
      had been moved into the pci core resulting in ARM related compile
      errors -
        drivers/built-in.o:(.data+0x230): multiple definition of
        `pcibios_max_latency'
        arch/arm/common/built-in.o:(.data+0x40c): first defined here
        make[1]: *** [vmlinux.o] Error 1
      
      In the series, patch 2/16 (commit 168c8619) converted the ARM
      specific version of 'pcibios_set_master()' to a non-inlined version.
      This was done in preperation for hosting it up into PCI's core, which
      was done in patch 10/16 (commit 96c55900) of the series (and
      where the removal of ARM's 'pcibios_max_latency' was overlooked).
      Reported-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      Signed-off-by: default avatarMyron Stowe <myron.stowe@redhat.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      e23e8c06
    • Santosh Shilimkar's avatar
      ARM: 7336/1: smp_twd: Don't register CPUFREQ notifiers if local timers are not initialised · 910ba598
      Santosh Shilimkar authored
      Current ARM local timer code registers CPUFREQ notifiers even in case
      the twd_timer_setup() isn't called. That seems to be wrong and
      would eventually lead to kernel crash on the CPU frequency transitions
      on the SOCs where the local timer doesn't exist or broken because of
      hardware BUG. Fix it by testing twd_evt and *__this_cpu_ptr(twd_evt).
      
      The issue was observed with v3.3-rc3 and building an OMAP2+ kernel
      on OMAP3 SOC which doesn't have TWD.
      
      Below is the dump for reference :
      
       Unable to handle kernel paging request at virtual address 007e900
       pgd = cdc20000
       [007e9000] *pgd=00000000
       Internal error: Oops: 5 [#1] SMP
       Modules linked in:
       CPU: 0    Not tainted  (3.3.0-rc3-pm+debug+initramfs #9)
       PC is at twd_update_frequency+0x34/0x48
       LR is at twd_update_frequency+0x10/0x48
       pc : [<c001382c>]    lr : [<c0013808>]    psr: 60000093
       sp : ce311dd8  ip : 00000000  fp : 00000000
       r10: 00000000  r9 : 00000001  r8 : ce310000
       r7 : c0440458  r6 : c00137f8  r5 : 00000000  r4 : c0947a74
       r3 : 00000000  r2 : 007e9000  r1 : 00000000  r0 : 00000000
       Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment usr
       Control: 10c5387d  Table: 8dc20019  DAC: 00000015
       Process sh (pid: 599, stack limit = 0xce3102f8)
       Stack: (0xce311dd8 to 0xce312000)
       1dc0:                                                       6000c
       1de0: 00000001 00000002 00000000 00000000 00000000 00000000 00000
       1e00: ffffffff c093d8f0 00000000 ce311ebc 00000001 00000001 ce310
       1e20: c001386c c0437c4c c0e95b60 c0e95ba8 00000001 c0e95bf8 ffff4
       1e40: 00000000 00000000 c005ef74 ce310000 c0435cf0 ce311ebc 00000
       1e60: ce352b40 0007a120 c08d5108 c08ba040 c08ba040 c005f030 00000
       1e80: c08bc554 c032fe2c 0007a120 c08d4b64 ce352b40 c08d8618 ffff8
       1ea0: c08ba040 c033364c ce311ecc c0433b50 00000002 ffffffea c0330
       1ec0: 0007a120 0007a120 22222201 00000000 22222222 00000000 ce357
       1ee0: ce3d6000 cdc2aed8 ce352ba0 c0470164 00000002 c032f47c 00034
       1f00: c0331cac ce352b40 00000007 c032f6d0 ce352bbc 0003d090 c0930
       1f20: c093d8bc c03306a4 00000007 ce311f80 00000007 cdc2aec0 ce358
       1f40: ce8d20c0 00000007 b6fe5000 ce311f80 00000007 ce310000 0000c
       1f60: c000de74 ce987400 ce8d20c0 b6fe5000 00000000 00000000 0000c
       1f80: 00000000 00000000 001fbac8 00000000 00000007 001fbac8 00004
       1fa0: c000df04 c000dd60 00000007 001fbac8 00000001 b6fe5000 00000
       1fc0: 00000007 001fbac8 00000007 00000004 b6fe5000 00000000 00202
       1fe0: 00000000 beb565f8 00101ffc 00008e8c 60000010 00000001 00000
       [<c001382c>] (twd_update_frequency+0x34/0x48) from [<c008ac4c>] )
       [<c008ac4c>] (smp_call_function_single+0x17c/0x1c8) from [<c0013)
       [<c0013890>] (twd_cpufreq_transition+0x24/0x30) from [<c0437c4c>)
       [<c0437c4c>] (notifier_call_chain+0x44/0x84) from [<c005efe4>] ()
       [<c005efe4>] (__srcu_notifier_call_chain+0x70/0xa4) from [<c005f)
       [<c005f030>] (srcu_notifier_call_chain+0x18/0x20) from [<c032fe2)
       [<c032fe2c>] (cpufreq_notify_transition+0xc8/0x1b0) from [<c0333)
       [<c033364c>] (omap_target+0x1b4/0x28c) from [<c032f47c>] (__cpuf)
       [<c032f47c>] (__cpufreq_driver_target+0x50/0x64) from [<c0331d24)
       [<c0331d24>] (cpufreq_set+0x78/0x98) from [<c032f6d0>] (store_sc)
       [<c032f6d0>] (store_scaling_setspeed+0x5c/0x74) from [<c03306a4>)
       [<c03306a4>] (store+0x58/0x74) from [<c014d868>] (sysfs_write_fi)
       [<c014d868>] (sysfs_write_file+0x80/0xb4) from [<c00f2c2c>] (vfs)
       [<c00f2c2c>] (vfs_write+0xa8/0x138) from [<c00f2e9c>] (sys_write)
       [<c00f2e9c>] (sys_write+0x40/0x6c) from [<c000dd60>] (ret_fast_s)
       Code: e594300c e792210c e1a01000 e5840004 (e7930002)
       ---[ end trace 5da3b5167c1ecdda ]---
      Reported-by: default avatarKevin Hilman <khilman@ti.com>
      Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
      Tested-by: default avatarKevin Hilman <khilman@ti.com>
      Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      910ba598
    • Linus Torvalds's avatar
      i387: export 'fpu_owner_task' per-cpu variable · 27e74da9
      Linus Torvalds authored
      (And define it properly for x86-32, which had its 'current_task'
      declaration in separate from x86-64)
      
      Bitten by my dislike for modules on the machines I use, and the fact
      that apparently nobody else actually wanted to test the patches I sent
      out.
      
      Snif. Nobody else cares.
      
      Anyway, we probably should uninline the 'kernel_fpu_begin()' function
      that is what modules actually use and that references this, but this is
      the minimal fix for now.
      Reported-by: default avatarJosh Boyer <jwboyer@gmail.com>
      Reported-and-tested-by: default avatarJongman Heo <jongman.heo@samsung.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      27e74da9
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 8ebbfb49
      Linus Torvalds authored
      Assorted fixes, sat in -next for a week or so...
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        ocfs2: deal with wraparounds of i_nlink in ocfs2_rename()
        vfs: fix compat_sys_stat() handling of overflows in st_nlink
        quota: Fix deadlock with suspend and quotas
        vfs: Provide function to get superblock and wait for it to thaw
        vfs: fix panic in __d_lookup() with high dentry hashtable counts
        autofs4 - fix lockdep splat in autofs
        vfs: fix d_inode_lookup() dentry ref leak
      8ebbfb49
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux · 39e255da
      Linus Torvalds authored
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
        [S390] correct ktime to tod clock comparator conversion
        [S390] 3215 deadlock with tty_wakeup
        [S390] incorrect PageTables counter for kvm page tables
        [S390] idle: avoid RCU usage in extended quiescent state
      39e255da
    • Linus Torvalds's avatar
  3. 20 Feb, 2012 4 commits
    • Linus Torvalds's avatar
      i387: support lazy restore of FPU state · 7e16838d
      Linus Torvalds authored
      This makes us recognize when we try to restore FPU state that matches
      what we already have in the FPU on this CPU, and avoids the restore
      entirely if so.
      
      To do this, we add two new data fields:
      
       - a percpu 'fpu_owner_task' variable that gets written any time we
         update the "has_fpu" field, and thus acts as a kind of back-pointer
         to the task that owns the CPU.  The exception is when we save the FPU
         state as part of a context switch - if the save can keep the FPU
         state around, we leave the 'fpu_owner_task' variable pointing at the
         task whose FP state still remains on the CPU.
      
       - a per-thread 'last_cpu' field, that indicates which CPU that thread
         used its FPU on last.  We update this on every context switch
         (writing an invalid CPU number if the last context switch didn't
         leave the FPU in a lazily usable state), so we know that *that*
         thread has done nothing else with the FPU since.
      
      These two fields together can be used when next switching back to the
      task to see if the CPU still matches: if 'fpu_owner_task' matches the
      task we are switching to, we know that no other task (or kernel FPU
      usage) touched the FPU on this CPU in the meantime, and if the current
      CPU number matches the 'last_cpu' field, we know that this thread did no
      other FP work on any other CPU, so the FPU state on the CPU must match
      what was saved on last context switch.
      
      In that case, we can avoid the 'f[x]rstor' entirely, and just clear the
      CR0.TS bit.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      7e16838d
    • Linus Torvalds's avatar
      i387: use 'restore_fpu_checking()' directly in task switching code · 80ab6f1e
      Linus Torvalds authored
      This inlines what is usually just a couple of instructions, but more
      importantly it also fixes the theoretical error case (can that FPU
      restore really ever fail? Maybe we should remove the checking).
      
      We can't start sending signals from within the scheduler, we're much too
      deep in the kernel and are holding the runqueue lock etc.  So don't
      bother even trying.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      80ab6f1e
    • Linus Torvalds's avatar
      i387: fix up some fpu_counter confusion · cea20ca3
      Linus Torvalds authored
      This makes sure we clear the FPU usage counter for newly created tasks,
      just so that we start off in a known state (for example, don't try to
      preload the FPU state on the first task switch etc).
      
      It also fixes a thinko in when we increment the fpu_counter at task
      switch time, introduced by commit 34ddc81a ("i387: re-introduce FPU
      state preloading at context switch time").  We should increment the
      *new* task fpu_counter, not the old task, and only if we decide to use
      that state (whether lazily or preloaded).
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cea20ca3
    • Dmitry Kasatkin's avatar
      digsig: changed type of the timestamp · 59cca653
      Dmitry Kasatkin authored
      time_t was used in the signature and key packet headers,
      which is typedef of long and is different on 32 and 64 bit architectures.
      Signature and key format should be independent of architecture.
      Similar to GPG, I have changed the type to uint32_t.
      Signed-off-by: default avatarDmitry Kasatkin <dmitry.kasatkin@intel.com>
      Signed-off-by: default avatarJames Morris <jmorris@namei.org>
      59cca653
  4. 18 Feb, 2012 12 commits
    • Linus Torvalds's avatar
      Linux 3.3-rc4 · b01543df
      Linus Torvalds authored
      b01543df
    • Linus Torvalds's avatar
      Merge tag 'fixes-3.3-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · be2874cb
      Linus Torvalds authored
      These are the bug fixes that have accumulated since 3.3-rc3 in arm-soc.
      The majority of them are regression fixes for stuff that broke during
      the merge 3.3 window.
      
      The notable ones are:
      
      * The at91 ata drivers both broke because of an earlier cleanup patch that
        some other patches were based on. Jean-Christophe decided to remove
        the legacy at91_ide driver and fix the new-style at91-pata driver while
        keeping the cleanup patch. I almost rejected the patches for being too
        late and too big but in the end decided to accept them because they
        fix a regression.
      
      * A patch fixing build breakage from the sysdev-to-device conversion
        colliding with other changes touches a number of mach-s3c files.
      
      * b0654037 "ARM: orion: Fix Orion5x GPIO regression from MPP cleanup"
        is a mechanical change that unfortunately touches a lot of lines
        that should up in the diffstat.
      
      * tag 'fixes-3.3-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (28 commits)
        ARM: at91: drop ide driver in favor of the pata one
        pata/at91: use newly introduced SMC accessors
        ARM: at91: add accessor to manage SMC
        ARM: at91:rtc/rtc-at91sam9: ioremap register bank
        ARM: at91: USB AT91 gadget registration for module
        ep93xx: fix build of vision_ep93xx.c
        ARM: OMAP2xxx: PM: fix OMAP2xxx-specific UART idle bug in v3.3
        ARM: orion: Fix USB phy for orion5x.
        ARM: orion: Fix Orion5x GPIO regression from MPP cleanup
        ARM: EXYNOS: Add cpu-offset property in gic device tree node
        ARM: EXYNOS: Bring exynos4-dt up to date
        ARM: OMAP3: cm-t35: fix section mismatch warning
        ARM: OMAP2: Fix the OMAP2 only build break seen with 2011+ ARM tool-chains
        ARM: tegra: paz00: fix wrong UART port on mini-pcie plug
        ARM: tegra: paz00: fix wrong SD1 power gpio
        i2c: tegra: Add devexit_p() for remove
        ARM: EXYNOS: Correct M-5MOLS sensor clock frequency on Universal C210 board
        ARM: EXYNOS: Correct framebuffer window size on Nuri board
        ARM: SAMSUNG: Fix missing api-change from subsys_interface change
        ARM: EXYNOS: Fix "warning: initialization from incompatible pointer type"
        ...
      be2874cb
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · 584216b7
      Linus Torvalds authored
      1) VETH_INFO_PEER netlink attribute needs to have it's size validated,
         from Thomas Graf.
      
      2) 'poll' module option of bnx2x driver crashes the machine, just remove
         it.  From Michal Schmidt.
      
      3) ks8851_mll driver reads the irq number from two places, but only
         initializes one of them, oops.  Use only one location and fix this
         problem, from Jan Weitzel.
      
      4) Fix buffer overrun and unicast sterring bugs in mellanox mlx4 driver,
         from Eugenia Emantayev.
      
      5) Swapped kcalloc() args in RxRPC and mlx4, from Axel Lin.
      
      6) PHY MDIO device name regression fixes from Florian Fainelli.
      
      7) If the wake event IRQ line is different from the netdevice one, we
         have to properly route it to the stmmac interrupt handler.  From
         Francesco Virlinzi.
      
      8) Fix rwlock lock initialization ordering bug in mac80211, from
         Mohammed Shafi Shajakhan.
      
      9) TCP lost_cnt can get out of sync, and in fact go negative, in certain
         circumstances.  Fix the way we specify what sequence range to operate
         on in tcp_sacktag_one() to fix this bug.  From Neal Cardwell.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (27 commits)
        net/ethernet: ks8851_mll fix irq handling
        veth: Enforce minimum size of VETH_INFO_PEER
        stmmac: update the driver version to Feb 2012 (v2)
        stmmac: move hw init in the probe (v2)
        stmmac: request_irq when use an ext wake irq line (v2)
        stmmac: do not discard frame on dribbling bit assert
        ipheth: Add iPhone 4S
        mlx4: add unicast steering entries to resource_tracker
        mlx4: fix QP tree trashing
        mlx4: fix buffer overrun
        3c59x: shorten timer period for slave devices
        netpoll: netpoll_poll_dev() should access dev->flags
        RxRPC: Fix kcalloc parameters swapped
        bnx2x: remove the 'poll' module option
        tcp: fix tcp_shifted_skb() adjustment of lost_cnt_hint for FACK
        ks8851: Fix NOHZ local_softirq_pending 08 warning
        bnx2x: fix bnx2x_storm_stats_update() on big endian
        ixp4xx-eth: fix PHY name to match MDIO bus name
        octeon: fix PHY name to match MDIO bus name
        fec: fix PHY name to match fixed MDIO bus name
        ...
      584216b7
    • Linus Torvalds's avatar
      Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap · bff98bfc
      Linus Torvalds authored
      Fixes a bootstrapping issue for some registers when a less commonly used
      method for register cache initialisation is used.  Only affects a fairly
      small proportion of users that both don't use explicit register defaults
      and do use the cache.
      
      * tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
        regmap: Fix cache defaults initialization from raw cache defaults
      bff98bfc
    • Linus Torvalds's avatar
      Merge tag 'ecryptfs-3.3-rc4-fixes' of... · 46860666
      Linus Torvalds authored
      Merge tag 'ecryptfs-3.3-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs
      
      Fixes maximum filename length and filesystem type reporting in statfs() calls
      and also fixes stale inode mode bits on eCryptfs inodes after a POSIX ACL was
      set on the lower filesystem's inode.
      
      * tag 'ecryptfs-3.3-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tyhicks/ecryptfs:
        ecryptfs: remove the second argument of k[un]map_atomic()
        eCryptfs: Copy up lower inode attrs after setting lower xattr
        eCryptfs: Improve statfs reporting
      46860666
    • Linus Torvalds's avatar
      Merge tag 'pinctrl' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl · 7857b996
      Linus Torvalds authored
      pinctrl fixes for v3.3
      
      * tag 'pinctrl-for-torvalds-20120216' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
        pinctrl: restore pin naming
      7857b996
    • Linus Torvalds's avatar
      Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc · 06ca7c43
      Linus Torvalds authored
      Here are a few more fixes for powerpc.  Some are regressions, the rest
      is simple/obvious/nasty enough that I deemed it good to go now.
      
      Here's also step one of deprecating legacy iSeries support: we are
      removing it from the main defconfig.
      
      Nobody seems to be using it anymore and the code is nasty to maintain,
      (involves horrible hacks in various low level areas of the kernel) so we
      plan to actually rip it out at some point.  For now let's just avoid
      building it by default.  Stephen will proceed to do the actual removal
      later (probably 3.4 or 3.5).
      
      * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
        powerpc/perf: power_pmu_start restores incorrect values, breaking frequency events
        powerpc/adb: Use set_current_state()
        powerpc: Disable interrupts early in Program Check
        powerpc: Remove legacy iSeries from ppc64_defconfig
        powerpc/fsl/pci: Fix PCIe fixup regression
        powerpc: Fix kernel log of oops/panic instruction dump
      06ca7c43
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci · 7bcd5b46
      Linus Torvalds authored
      One regression fix for SR-IOV on PPC and a couple of misc fixes from
      Yinghai.
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci:
        PCI: Fix pci cardbus removal
        PCI: set pci sriov page size before reading SRIOV BAR
        PCI: workaround hard-wired bus number V2
      7bcd5b46
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · 58e44baf
      Linus Torvalds authored
      3 radeon fixes, I have some exynos fixes to push later but I'll queue
      them separately once I've looked them over a bit.
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux:
        drm/radeon/kms: fix MSI re-arm on rv370+
        drm/radeon/kms/atom: bios scratch reg handling updates
        drm/radeon/kms: drop lock in return path of radeon_fence_count_emitted.
      58e44baf
    • Linus Torvalds's avatar
    • Linus Torvalds's avatar
      i387: re-introduce FPU state preloading at context switch time · 34ddc81a
      Linus Torvalds authored
      After all the FPU state cleanups and finally finding the problem that
      caused all our FPU save/restore problems, this re-introduces the
      preloading of FPU state that was removed in commit b3b0870e ("i387:
      do not preload FPU state at task switch time").
      
      However, instead of simply reverting the removal, this reimplements
      preloading with several fixes, most notably
      
       - properly abstracted as a true FPU state switch, rather than as
         open-coded save and restore with various hacks.
      
         In particular, implementing it as a proper FPU state switch allows us
         to optimize the CR0.TS flag accesses: there is no reason to set the
         TS bit only to then almost immediately clear it again.  CR0 accesses
         are quite slow and expensive, don't flip the bit back and forth for
         no good reason.
      
       - Make sure that the same model works for both x86-32 and x86-64, so
         that there are no gratuitous differences between the two due to the
         way they save and restore segment state differently due to
         architectural differences that really don't matter to the FPU state.
      
       - Avoid exposing the "preload" state to the context switch routines,
         and in particular allow the concept of lazy state restore: if nothing
         else has used the FPU in the meantime, and the process is still on
         the same CPU, we can avoid restoring state from memory entirely, just
         re-expose the state that is still in the FPU unit.
      
         That optimized lazy restore isn't actually implemented here, but the
         infrastructure is set up for it.  Of course, older CPU's that use
         'fnsave' to save the state cannot take advantage of this, since the
         state saving also trashes the state.
      
      In other words, there is now an actual _design_ to the FPU state saving,
      rather than just random historical baggage.  Hopefully it's easier to
      follow as a result.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      34ddc81a
    • Linus Torvalds's avatar
      i387: move TS_USEDFPU flag from thread_info to task_struct · f94edacf
      Linus Torvalds authored
      This moves the bit that indicates whether a thread has ownership of the
      FPU from the TS_USEDFPU bit in thread_info->status to a word of its own
      (called 'has_fpu') in task_struct->thread.has_fpu.
      
      This fixes two independent bugs at the same time:
      
       - changing 'thread_info->status' from the scheduler causes nasty
         problems for the other users of that variable, since it is defined to
         be thread-synchronous (that's what the "TS_" part of the naming was
         supposed to indicate).
      
         So perfectly valid code could (and did) do
      
      	ti->status |= TS_RESTORE_SIGMASK;
      
         and the compiler was free to do that as separate load, or and store
         instructions.  Which can cause problems with preemption, since a task
         switch could happen in between, and change the TS_USEDFPU bit. The
         change to TS_USEDFPU would be overwritten by the final store.
      
         In practice, this seldom happened, though, because the 'status' field
         was seldom used more than once, so gcc would generally tend to
         generate code that used a read-modify-write instruction and thus
         happened to avoid this problem - RMW instructions are naturally low
         fat and preemption-safe.
      
       - On x86-32, the current_thread_info() pointer would, during interrupts
         and softirqs, point to a *copy* of the real thread_info, because
         x86-32 uses %esp to calculate the thread_info address, and thus the
         separate irq (and softirq) stacks would cause these kinds of odd
         thread_info copy aliases.
      
         This is normally not a problem, since interrupts aren't supposed to
         look at thread information anyway (what thread is running at
         interrupt time really isn't very well-defined), but it confused the
         heck out of irq_fpu_usable() and the code that tried to squirrel
         away the FPU state.
      
         (It also caused untold confusion for us poor kernel developers).
      
      It also turns out that using 'task_struct' is actually much more natural
      for most of the call sites that care about the FPU state, since they
      tend to work with the task struct for other reasons anyway (ie
      scheduling).  And the FPU data that we are going to save/restore is
      found there too.
      
      Thanks to Arjan Van De Ven <arjan@linux.intel.com> for pointing us to
      the %esp issue.
      
      Cc: Arjan van de Ven <arjan@linux.intel.com>
      Reported-and-tested-by: default avatarRaphael Prevost <raphael@buro.asia>
      Acked-and-tested-by: default avatarSuresh Siddha <suresh.b.siddha@intel.com>
      Tested-by: default avatarPeter Anvin <hpa@zytor.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f94edacf
  5. 17 Feb, 2012 5 commits
    • Martin Schwidefsky's avatar
      [S390] correct ktime to tod clock comparator conversion · cf1eb40f
      Martin Schwidefsky authored
      The conversion of the ktime to a value suitable for the clock comparator
      does not take changes to wall_to_monotonic into account. In fact the
      conversion just needs the boot clock (sched_clock_base_cc) and the
      total_sleep_time.
      
      This is applicable to 3.2+ kernels.
      
      CC: stable@vger.kernel.org
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      cf1eb40f
    • Martin Schwidefsky's avatar
      [S390] 3215 deadlock with tty_wakeup · 656d9125
      Martin Schwidefsky authored
      The 3215 driver calls tty_wakeup from irq context while holding the
      device spinlock. If printk is called by any function on the callchain
      starting from tty_wakeup the system deadlocks on the device spinlock.
      Using a tasklet to call tty_wakup solves the problem.
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      656d9125
    • Martin Schwidefsky's avatar
      [S390] incorrect PageTables counter for kvm page tables · 2320c579
      Martin Schwidefsky authored
      The page_table_free_pgste function is used for kvm processes to free page
      tables that have the pgste extension. It calls pgtable_page_ctor instead of
      pgtable_page_dtor which increases NR_PAGETABLE instead of decreasing it.
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      2320c579
    • Heiko Carstens's avatar
      [S390] idle: avoid RCU usage in extended quiescent state · f3612304
      Heiko Carstens authored
      Avoid calling wake_up() from our NMI "bottom halve" from RCU extended
      quiescent state in idle. wake_up() has RCU read-side critical sections
      but this will be completely ignored by RCU if the cpu is in extended
      quiescent state.
      Which means that whatever object is being accessed from within the
      read-side critical section can be freed concurrently from a different
      cpu.
      So make sure we leave extended quiescent state before calling wake_up().
      Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      f3612304
    • Linus Torvalds's avatar
      i387: move AMD K7/K8 fpu fxsave/fxrstor workaround from save to restore · 4903062b
      Linus Torvalds authored
      The AMD K7/K8 CPUs don't save/restore FDP/FIP/FOP unless an exception is
      pending.  In order to not leak FIP state from one process to another, we
      need to do a floating point load after the fxsave of the old process,
      and before the fxrstor of the new FPU state.  That resets the state to
      the (uninteresting) kernel load, rather than some potentially sensitive
      user information.
      
      We used to do this directly after the FPU state save, but that is
      actually very inconvenient, since it
      
       (a) corrupts what is potentially perfectly good FPU state that we might
           want to lazy avoid restoring later and
      
       (b) on x86-64 it resulted in a very annoying ordering constraint, where
           "__unlazy_fpu()" in the task switch needs to be delayed until after
           the DS segment has been reloaded just to get the new DS value.
      
      Coupling it to the fxrstor instead of the fxsave automatically avoids
      both of these issues, and also ensures that we only do it when actually
      necessary (the FP state after a save may never actually get used).  It's
      simply a much more natural place for the leaked state cleanup.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4903062b
  6. 16 Feb, 2012 5 commits
    • Linus Torvalds's avatar
      i387: do not preload FPU state at task switch time · b3b0870e
      Linus Torvalds authored
      Yes, taking the trap to re-load the FPU/MMX state is expensive, but so
      is spending several days looking for a bug in the state save/restore
      code.  And the preload code has some rather subtle interactions with
      both paravirtualization support and segment state restore, so it's not
      nearly as simple as it should be.
      
      Also, now that we no longer necessarily depend on a single bit (ie
      TS_USEDFPU) for keeping track of the state of the FPU, we migth be able
      to do better.  If we are really switching between two processes that
      keep touching the FP state, save/restore is inevitable, but in the case
      of having one process that does most of the FPU usage, we may actually
      be able to do much better than the preloading.
      
      In particular, we may be able to keep track of which CPU the process ran
      on last, and also per CPU keep track of which process' FP state that CPU
      has.  For modern CPU's that don't destroy the FPU contents on save time,
      that would allow us to do a lazy restore by just re-enabling the
      existing FPU state - with no restore cost at all!
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b3b0870e
    • Cong Wang's avatar
      465c9343
    • Tyler Hicks's avatar
      eCryptfs: Copy up lower inode attrs after setting lower xattr · 545d6809
      Tyler Hicks authored
      After passing through a ->setxattr() call, eCryptfs needs to copy the
      inode attributes from the lower inode to the eCryptfs inode, as they
      may have changed in the lower filesystem's ->setxattr() path.
      
      One example is if an extended attribute containing a POSIX Access
      Control List is being set. The new ACL may cause the lower filesystem to
      modify the mode of the lower inode and the eCryptfs inode would need to
      be updated to reflect the new mode.
      
      https://launchpad.net/bugs/926292Signed-off-by: default avatarTyler Hicks <tyhicks@canonical.com>
      Reported-by: default avatarSebastien Bacher <seb128@ubuntu.com>
      Cc: John Johansen <john.johansen@canonical.com>
      Cc: <stable@vger.kernel.org>
      545d6809
    • Tyler Hicks's avatar
      eCryptfs: Improve statfs reporting · 4a26620d
      Tyler Hicks authored
      statfs() calls on eCryptfs files returned the wrong filesystem type and,
      when using filename encryption, the wrong maximum filename length.
      
      If mount-wide filename encryption is enabled, the cipher block size and
      the lower filesystem's max filename length will determine the max
      eCryptfs filename length. Pre-tested, known good lengths are used when
      the lower filesystem's namelen is 255 and a cipher with 8 or 16 byte
      block sizes is used. In other, less common cases, we fall back to a safe
      rounded-down estimate when determining the eCryptfs namelen.
      
      https://launchpad.net/bugs/885744Signed-off-by: default avatarTyler Hicks <tyhicks@canonical.com>
      Reported-by: default avatarKees Cook <keescook@chromium.org>
      Reviewed-by: default avatarKees Cook <keescook@chromium.org>
      Reviewed-by: default avatarJohn Johansen <john.johansen@canonical.com>
      4a26620d
    • Linus Torvalds's avatar
      i387: don't ever touch TS_USEDFPU directly, use helper functions · 6d59d7a9
      Linus Torvalds authored
      This creates three helper functions that do the TS_USEDFPU accesses, and
      makes everybody that used to do it by hand use those helpers instead.
      
      In addition, there's a couple of helper functions for the "change both
      CR0.TS and TS_USEDFPU at the same time" case, and the places that do
      that together have been changed to use those.  That means that we have
      fewer random places that open-code this situation.
      
      The intent is partly to clarify the code without actually changing any
      semantics yet (since we clearly still have some hard to reproduce bug in
      this area), but also to make it much easier to use another approach
      entirely to caching the CR0.TS bit for software accesses.
      
      Right now we use a bit in the thread-info 'status' variable (this patch
      does not change that), but we might want to make it a full field of its
      own or even make it a per-cpu variable.
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6d59d7a9