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    • Linus Torvalds's avatar
      Merge tag 'pm-fixes-for-3.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 23783f81
      Linus Torvalds authored 
      Power management fixes for 3.3-rc3

Three power management regression fixes, one for a recent regression introcuded
by the freezer changes during the 3.3 merge window and two for regressions
in cpuidle (resulting from PM QoS changes) and in the hibernate user space
interface, both introduced during the 3.2 development cycle.

They include:

* Two hibernate (s2disk) regression fixes from Srivatsa S. Bhat (for
 regressions introduced during the 3.3 merge window and during the 3.2
 development cycle).

* A cpuidle fix from Venki Pallipadi for a regression resulting from PM QoS
 changes during the 3.2 development cycle causing cpuidle to work incorrectly
 for CONFIG_PM unset.

* tag 'pm-fixes-for-3.3-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM / QoS: CPU C-state breakage with PM Qos change
  PM / Freezer: Thaw only kernel threads if freezing of kernel threads fails
  PM / Hibernate: Thaw kernel threads in SNAPSHOT_CREATE_IMAGE ioctl path
      23783f81
    • Venkatesh Pallipadi's avatar
      PM / QoS: CPU C-state breakage with PM Qos change · d020283d
      Venkatesh Pallipadi authored 
      Looks like change "PM QoS: Move and rename the implementation files"
merged during the 3.2 development cycle made PM QoS depend on
CONFIG_PM which depends on (PM_SLEEP || PM_RUNTIME).

That breaks CPU C-states with kernels not having these CONFIGs, causing CPUs
to spend time in Polling loop idle instead of going into deep C-states,
consuming way way more power. This is with either acpi idle or intel idle
enabled.

Either CONFIG_PM should be enabled with any pm_qos users or
the !CONFIG_PM pm_qos_request() should return sane defaults not to break
the existing users. Here's is the patch for the latter option.

[rjw: Modified the changelog slightly.]
Signed-off-by: default avatarVenkatesh Pallipadi <venki@google.com>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
Cc: stable@vger.kernel.org
      d020283d
    • Srivatsa S. Bhat's avatar
      PM / Freezer: Thaw only kernel threads if freezing of kernel threads fails · 379e0be8
      Srivatsa S. Bhat authored 
      If freezing of kernel threads fails, we are expected to automatically
thaw tasks in the error recovery path. However, at times, we encounter
situations in which we would like the automatic error recovery path
to thaw only the kernel threads, because we want to be able to do
some more cleanup before we thaw userspace. Something like:

error = freeze_kernel_threads();
if (error) {
	/* Do some cleanup */

	/* Only then thaw userspace tasks*/
	thaw_processes();
}

An example of such a situation is where we freeze/thaw filesystems
during suspend/hibernation. There, if freezing of kernel threads
fails, we would like to thaw the frozen filesystems before thawing
the userspace tasks.

So, modify freeze_kernel_threads() to thaw only kernel threads in
case of freezing failure. And change suspend_freeze_processes()
accordingly. (At the same time, let us also get rid of the rather
cryptic usage of the conditional operator (:?) in that function.)

[rjw: In fact, this patch fixes a regression introduced during the
 3.3 merge window, because without it thaw_processes() may be called
 before swsusp_free() in some situations and that may lead to massive
 memory allocation failures.]
Signed-off-by: default avatarSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Acked-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarNigel Cunningham <nigel@tuxonice.net>
Signed-off-by: default avatarRafael J. Wysocki <rjw@sisk.pl>
      379e0be8
    • Linus Torvalds's avatar
      Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc · d9142025
      Linus Torvalds authored 
      arm-soc fixes for 3.3-rc

* A series of OMAP regression fixes for merge window fallout
* Two patches for Davinci, one removes some misdefined clocks, the other
  is a regression fix for merge window fallout
* Two patches that makes Broadcom bcmring build again (and removes a
  bunch of unused code in the process)

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc:
  ARM: bcmring: fix build failure in mach-bcmring/arch.c
  ARM: bcmring: remove unused DMA map code
  ARM: davinci: update mdio bus name
  ARM: OMAP2+: arch/arm/mach-omap2/smartreflex.c: add missing iounmap
  ARM: OMAP2+: arch/arm/mach-omap2/devices.c: introduce missing kfree
  ARM: OMAP: fix MMC2 loopback clock handling
  ARM: OMAP: fix erroneous mmc2 clock change on mmc3 setup
  ARM: OMAP2+: GPMC: fix device size setup
  ARM: OMAP2+: timer: Fix crash due to wrong arg to __omap_dm_timer_read_counter
  ARM: OMAP3: hwmod data: register dss hwmods after dss_core
  ARM: OMAP2/3: PRM: fix missing plat/irqs.h build breakage
  ARM: OMAP2+: io: fix compilation breakage on 2420-only configs
  ARM: OMAP4: hwmod data: Add names for DMIC memory address space
  ARM: OMAP3: hwmod data: add SYSC_HAS_ENAWAKEUP for dispc
  ARM: OMAP2+: hwmod data: split omap2/3 dispc hwmod class
  ARM: davinci: DA850: remove non-existing pll1_sysclk4-7 clocks
  ARM: OMAP2: fix regulator warnings
  ARM: OMAP2: fix omap3 touchbook kconfig warning
  i2c: OMAP: Fix OMAP1 build error
      d9142025
    • Paul Gortmaker's avatar
      ARM: bcmring: fix build failure in mach-bcmring/arch.c · ca43784d
      Paul Gortmaker authored 
      Upstream commit d1fce9c1

   "ARM: restart: bcmring: use new restart hook"

breaks building of this platform, since what used to be the
last field of the MACHINE_START/END block didn't have a
trailing comma.  Once another field was added below, we get:

arch/arm/mach-bcmring/arch.c:198: error: request for member 'restart' in something not a structure or union
Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: default avatarJiandong Zheng <jdzheng@broadcom.com>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
      ca43784d
    • JD Zheng's avatar
      ARM: bcmring: remove unused DMA map code · 864e5e36
      JD Zheng authored 
      Remove BCMRING DMA map code which is no longer used.

This also fixes a build error with dma.c introduced by
bfcd2ea6.
Signed-off-by: default avatarJiandong Zheng <jdzheng@broadcom.com>
Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
      864e5e36
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 31c150a1
      Linus Torvalds authored 
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: i8042 - add Lenovo Ideapad U455 to 'reset' blacklist
  Input: serio_raw - return proper result when serio_raw_read fails
  Input: document device properties
  Input: twl4030_keypad - fix comment (trivial)
  Input: gpio_keys - fix struct device declared inside parameter list
  Input: evdev - fix variable initialisation
      31c150a1
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.infradead.org/users/vkoul/slave-dma · 4554c135
      Linus Torvalds authored 
      * 'fixes' of git://git.infradead.org/users/vkoul/slave-dma:
  i.MX SDMA: Fix burstsize settings
  ARM: mach-shmobile: both USB DMAC instances on sh7372 are slave-only
  dma: sh_dma: not all SH DMAC implementations support MEMCPY
  at_hdmac: bugfix for enabling channel irq
  dmaengine: fix missing 'cnt' in ?: in dmatest
      4554c135
    • Linus Torvalds's avatar
      Merge branch 'akpm' · 82bdc843
      Linus Torvalds authored 
      * akpm:
  mm: compaction: check pfn_valid when entering a new MAX_ORDER_NR_PAGES block during isolation for migration
  readahead: fix pipeline break caused by block plug
  kprobes: fix a memory leak in function pre_handler_kretprobe()
  drivers/tty/vt/vt_ioctl.c: fix KDFONTOP 32bit compatibility layer
  lkdtm: avoid calling lkdtm_do_action() with spinlock held
  mm/filemap_xip.c: fix race condition in xip_file_fault()
  mm/memcontrol.c: fix warning with CONFIG_NUMA=n
  avr32: select generic atomic64_t support
  mm: postpone migrated page mapping reset
  xtensa: fix memscan()
  MAINTAINERS: update lguest F: patterns
  MAINTAINERS: remove staging sections
  MAINTAINERS: remove iMX5 section
  MAINTAINERS: update partitions block F: patterns
      82bdc843
    • Linus Torvalds's avatar
      Merge tag 'for-linus-3.3' of git://git.infradead.org/~dwmw2/mtd-3.3 · 71b1b20b
      Linus Torvalds authored 
       - Fix a regression in 16-bit Atmel NAND flash which was introduced in 3.1
 - Fix breakage with MTD suspend caused by the API rework
 - Fix a problem with resetting the MX28 BCH module
 - A couple of other trivial fixes

* tag 'for-linus-3.3-20120204' of git://git.infradead.org/~dwmw2/mtd-3.3:
  Revert "mtd: atmel_nand: optimize read/write buffer functions"
  mtd: fix MTD suspend
  jffs2: do not initialize variable unnecessarily
  mtd: gpmi-nand bugfix: reset the BCH module when it is not MX23
  mtd: nand: fix typo in comment
      71b1b20b
    • Artem Bityutskiy's avatar
      Revert "mtd: atmel_nand: optimize read/write buffer functions" · 50082319
      Artem Bityutskiy authored 
      This reverts commit fb542750.

The reason is that it breaks 16 bits NAND flash as it was reported by
Nikolaus Voss and confirmed by Eric Bénard.

Nicolas Ferre <nicolas.ferre@atmel.com> alco confirmed:
"After double checking with designers, I must admit that I misunderstood
the way of optimizing accesses to SMC. 16 bit nand is not so common
those days..."
Reported-by: default avatarNikolaus Voss <n.voss@weinmann.de>
Acked-by: default avatarNicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Cc: stable@kernel.org [3.1+]
      50082319
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm · d1256667
      Linus Torvalds authored 
      * 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
  ARM: 7314/1: kuser: consistently use usr_ret for returning from helpers
  ARM: 7302/1: Add TLB flushing for both entries in a PMD
  ARM: 7303/1: perf: add empty NODE event definitions for Cortex-A5 and Cortex-A15
  ARM: 7308/1: vfp: flush thread hwstate before copying ptrace registers
  ARM: 7307/1: vfp: fix ptrace regset modification race
  ARM: 7306/1: vfp: flush thread hwstate before restoring context from sigframe
  Revert "ARM: 7304/1: ioremap: fix boundary check when reusing static mapping"
      d1256667
    • Mel Gorman's avatar
      mm: compaction: check pfn_valid when entering a new MAX_ORDER_NR_PAGES block... · 0bf380bc
      Mel Gorman authored 
      mm: compaction: check pfn_valid when entering a new MAX_ORDER_NR_PAGES block during isolation for migration

When isolating for migration, migration starts at the start of a zone
which is not necessarily pageblock aligned.  Further, it stops isolating
when COMPACT_CLUSTER_MAX pages are isolated so migrate_pfn is generally
not aligned.  This allows isolate_migratepages() to call pfn_to_page() on
an invalid PFN which can result in a crash.  This was originally reported
against a 3.0-based kernel with the following trace in a crash dump.

PID: 9902   TASK: d47aecd0  CPU: 0   COMMAND: "memcg_process_s"
 #0 [d72d3ad0] crash_kexec at c028cfdb
 #1 [d72d3b24] oops_end at c05c5322
 #2 [d72d3b38] __bad_area_nosemaphore at c0227e60
 #3 [d72d3bec] bad_area at c0227fb6
 #4 [d72d3c00] do_page_fault at c05c72ec
 #5 [d72d3c80] error_code (via page_fault) at c05c47a4
    EAX: 00000000  EBX: 000c0000  ECX: 00000001  EDX: 00000807  EBP: 000c0000
    DS:  007b      ESI: 00000001  ES:  007b      EDI: f3000a80  GS:  6f50
    CS:  0060      EIP: c030b15a  ERR: ffffffff  EFLAGS: 00010002
 #6 [d72d3cb4] isolate_migratepages at c030b15a
 #7 [d72d3d14] zone_watermark_ok at c02d26cb
 #8 [d72d3d2c] compact_zone at c030b8de
 #9 [d72d3d68] compact_zone_order at c030bba1
#10 [d72d3db4] try_to_compact_pages at c030bc84
#11 [d72d3ddc] __alloc_pages_direct_compact at c02d61e7
#12 [d72d3e08] __alloc_pages_slowpath at c02d66c7
#13 [d72d3e78] __alloc_pages_nodemask at c02d6a97
#14 [d72d3eb8] alloc_pages_vma at c030a845
#15 [d72d3ed4] do_huge_pmd_anonymous_page at c03178eb
#16 [d72d3f00] handle_mm_fault at c02f36c6
#17 [d72d3f30] do_page_fault at c05c70ed
#18 [d72d3fb0] error_code (via page_fault) at c05c47a4
    EAX: b71ff000  EBX: 00000001  ECX: 00001600  EDX: 00000431
    DS:  007b      ESI: 08048950  ES:  007b      EDI: bfaa3788
    SS:  007b      ESP: bfaa36e0  EBP: bfaa3828  GS:  6f50
    CS:  0073      EIP: 080487c8  ERR: ffffffff  EFLAGS: 00010202

It was also reported by Herbert van den Bergh against 3.1-based kernel
with the following snippet from the console log.

BUG: unable to handle kernel paging request at 01c00008
IP: [<c0522399>] isolate_migratepages+0x119/0x390
*pdpt = 000000002f7ce001 *pde = 0000000000000000

It is expected that it also affects 3.2.x and current mainline.

The problem is that pfn_valid is only called on the first PFN being
checked and that PFN is not necessarily aligned.  Lets say we have a case
like this

H = MAX_ORDER_NR_PAGES boundary
| = pageblock boundary
m = cc->migrate_pfn
f = cc->free_pfn
o = memory hole

H------|------H------|----m-Hoooooo|ooooooH-f----|------H

The migrate_pfn is just below a memory hole and the free scanner is beyond
the hole.  When isolate_migratepages started, it scans from migrate_pfn to
migrate_pfn+pageblock_nr_pages which is now in a memory hole.  It checks
pfn_valid() on the first PFN but then scans into the hole where there are
not necessarily valid struct pages.

This patch ensures that isolate_migratepages calls pfn_valid when
necessary.
Reported-by: default avatarHerbert van den Bergh <herbert.van.den.bergh@oracle.com>
Tested-by: default avatarHerbert van den Bergh <herbert.van.den.bergh@oracle.com>
Signed-off-by: default avatarMel Gorman <mgorman@suse.de>
Acked-by: default avatarMichal Nazarewicz <mina86@mina86.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0bf380bc
    • Shaohua Li's avatar
      readahead: fix pipeline break caused by block plug · 3deaa719
      Shaohua Li authored 
      Herbert Poetzl reported a performance regression since 2.6.39.  The test
is a simple dd read, but with big block size.  The reason is:

T1: ra (A, A+128k), (A+128k, A+256k)
T2: lock_page for page A, submit the 256k
T3: hit page A+128K, ra (A+256k, A+384). the range isn't submitted
because of plug and there isn't any lock_page till we hit page A+256k
because all pages from A to A+256k is in memory
T4: hit page A+256k, ra (A+384, A+ 512). Because of plug, the range isn't
submitted again.
T5: lock_page A+256k, so (A+256k, A+512k) will be submitted. The task is
waitting for (A+256k, A+512k) finish.

There is no request to disk in T3 and T4, so readahead pipeline breaks.

We really don't need block plug for generic_file_aio_read() for buffered
I/O.  The readahead already has plug and has fine grained control when I/O
should be submitted.  Deleting plug for buffered I/O fixes the regression.

One side effect is plug makes the request size 256k, the size is 128k
without it.  This is because default ra size is 128k and not a reason we
need plug here.

Vivek said:

: We submit some readahead IO to device request queue but because of nested
: plug, queue never gets unplugged.  When read logic reaches a page which is
: not in page cache, it waits for page to be read from the disk
: (lock_page_killable()) and that time we flush the plug list.
:
: So effectively read ahead logic is kind of broken in parts because of
: nested plugging.  Removing top level plug (generic_file_aio_read()) for
: buffered reads, will allow unplugging queue earlier for readahead.
Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Reported-by: default avatarHerbert Poetzl <herbert@13thfloor.at>
Tested-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3deaa719
    • Jiang Liu's avatar
      kprobes: fix a memory leak in function pre_handler_kretprobe() · 55ca6140
      Jiang Liu authored 
      In function pre_handler_kretprobe(), the allocated kretprobe_instance
object will get leaked if the entry_handler callback returns non-zero.
This may cause all the preallocated kretprobe_instance objects exhausted.

This issue can be reproduced by changing
samples/kprobes/kretprobe_example.c to probe "mutex_unlock".  And the fix
is straightforward: just put the allocated kretprobe_instance object back
onto the free_instances list.

[akpm@linux-foundation.org: use raw_spin_lock/unlock]
Signed-off-by: default avatarJiang Liu <jiang.liu@huawei.com>
Acked-by: default avatarJim Keniston <jkenisto@us.ibm.com>
Acked-by: default avatarAnanth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      55ca6140
    • Samuel Thibault's avatar
      drivers/tty/vt/vt_ioctl.c: fix KDFONTOP 32bit compatibility layer · cbcb8346
      Samuel Thibault authored 
      KDFONTOP(GET) currently fails with EIO when being run in a 32bit userland
with a 64bit kernel if the font width is not 8.

This is because of the setting of the KD_FONT_FLAG_OLD flag, which makes
con_font_get return EIO in such case.

This flag should *not* be set for KDFONTOP, since it's actually the whole
point of this flag (see comment in con_font_set for instance).
Signed-off-by: default avatarSamuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: default avatarArnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Arthur Taylor <art@ified.ca>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cbcb8346
    • Cong Wang's avatar
      lkdtm: avoid calling lkdtm_do_action() with spinlock held · 92618184
      Cong Wang authored 
      lkdtm_do_action() may call sleeping functions like kmalloc(), so do not
call it with spin lock held.
Signed-off-by: default avatarWANG Cong <xiyou.wangcong@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Reviewed-by: default avatarDave Young <dyoung@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      92618184
    • Carsten Otte's avatar
      mm/filemap_xip.c: fix race condition in xip_file_fault() · 99f02ef1
      Carsten Otte authored 
      Fix a race condition that shows in conjunction with xip_file_fault() when
two threads of the same user process fault on the same memory page.

In this case, the race winner will install the page table entry and the
unlucky loser will cause an oops: xip_file_fault calls vm_insert_pfn (via
vm_insert_mixed) which drops out at this check:

	retval = -EBUSY;
	if (!pte_none(*pte))
		goto out_unlock;

The resulting -EBUSY return value will trigger a BUG_ON() in
xip_file_fault.

This fix simply considers the fault as fixed in this case, because the
race winner has successfully installed the pte.

[akpm@linux-foundation.org: use conventional (and consistent) comment layout]
Reported-by: default avatarDavid Sadler <dsadler@us.ibm.com>
Signed-off-by: default avatarCarsten Otte <cotte@de.ibm.com>
Reported-by: default avatarLouis Alex Eisner <leisner@cs.ucsd.edu>
Cc: Hugh Dickins <hughd@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      99f02ef1
    • Andrew Morton's avatar
      mm/memcontrol.c: fix warning with CONFIG_NUMA=n · 82b3f2a7
      Andrew Morton authored 
      mm/memcontrol.c: In function 'memcg_check_events':
mm/memcontrol.c:779: warning: unused variable 'do_numainfo'
Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Hiroyuki KAMEZAWA <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: default avatar"Kirill A. Shutemov" <kirill@shutemov.name>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      82b3f2a7
    • Fabio Baltieri's avatar
      avr32: select generic atomic64_t support · 31e0017e
      Fabio Baltieri authored 
      Enable use of the generic atomic64 implementation on AVR32 platforms.
Without this the kernel fails to build as the architecture does not
provide its version.
Signed-off-by: default avatarFabio Baltieri <fabio.baltieri@gmail.com>
Acked-by: default avatarHans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      31e0017e
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