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2010-11-25mm: remove call to find_vma in pagewalk for non-hugetlbfsDavid Sterba
Commit d33b9f45 ("mm: hugetlb: fix hugepage memory leak in walk_page_range()") introduces a check if a vma is a hugetlbfs one and later in 5dc37642 ("mm hugetlb: add hugepage support to pagemap") it is moved under #ifdef CONFIG_HUGETLB_PAGE but a needless find_vma call is left behind and its result is not used anywhere else in the function. The side-effect of caching vma for @addr inside walk->mm is neither utilized in walk_page_range() nor in called functions. Signed-off-by: David Sterba <dsterba@suse.cz> Reviewed-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Andi Kleen <ak@linux.intel.com> Cc: Andy Whitcroft <apw@canonical.com> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Matt Mackall <mpm@selenic.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Cc: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-25mm/page_alloc.c: fix build_all_zonelist() where percpu_alloc() is wrongly ↵KAMEZAWA Hiroyuki
called under stop_machine_run() During memory hotplug, build_allzonelists() may be called under stop_machine_run(). In this function, setup_zone_pageset() is called. But it's bug because it will do page allocation under stop_machine_run(). Here is a report from Alok Kataria. BUG: sleeping function called from invalid context at kernel/mutex.c:94 in_atomic(): 0, irqs_disabled(): 1, pid: 4, name: migration/0 Pid: 4, comm: migration/0 Not tainted 2.6.35.6-45.fc14.x86_64 #1 Call Trace: [<ffffffff8103d12b>] __might_sleep+0xeb/0xf0 [<ffffffff81468245>] mutex_lock+0x24/0x50 [<ffffffff8110eaa6>] pcpu_alloc+0x6d/0x7ee [<ffffffff81048888>] ? load_balance+0xbe/0x60e [<ffffffff8103a1b3>] ? rt_se_boosted+0x21/0x2f [<ffffffff8103e1cf>] ? dequeue_rt_stack+0x18b/0x1ed [<ffffffff8110f237>] __alloc_percpu+0x10/0x12 [<ffffffff81465e22>] setup_zone_pageset+0x38/0xbe [<ffffffff810d6d81>] ? build_zonelists_node.clone.58+0x79/0x8c [<ffffffff81452539>] __build_all_zonelists+0x419/0x46c [<ffffffff8108ef01>] ? cpu_stopper_thread+0xb2/0x198 [<ffffffff8108f075>] stop_machine_cpu_stop+0x8e/0xc5 [<ffffffff8108efe7>] ? stop_machine_cpu_stop+0x0/0xc5 [<ffffffff8108ef57>] cpu_stopper_thread+0x108/0x198 [<ffffffff81467a37>] ? schedule+0x5b2/0x5cc [<ffffffff8108ee4f>] ? cpu_stopper_thread+0x0/0x198 [<ffffffff81065f29>] kthread+0x7f/0x87 [<ffffffff8100aae4>] kernel_thread_helper+0x4/0x10 [<ffffffff81065eaa>] ? kthread+0x0/0x87 [<ffffffff8100aae0>] ? kernel_thread_helper+0x0/0x10 Built 5 zonelists in Node order, mobility grouping on. Total pages: 289456 Policy zone: Normal This patch tries to fix the issue by moving setup_zone_pageset() out from stop_machine_run(). It's obviously not necessary to be called under stop_machine_run(). [akpm@linux-foundation.org: remove unneeded local] Reported-by: Alok Kataria <akataria@vmware.com> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Tejun Heo <tj@kernel.org> Cc: Petr Vandrovec <petr@vmware.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-25cgroups: make swap accounting default behavior configurableMichal Hocko
Swap accounting can be configured by CONFIG_CGROUP_MEM_RES_CTLR_SWAP configuration option and then it is turned on by default. There is a boot option (noswapaccount) which can disable this feature. This makes it hard for distributors to enable the configuration option as this feature leads to a bigger memory consumption and this is a no-go for general purpose distribution kernel. On the other hand swap accounting may be very usuful for some workloads. This patch adds a new configuration option which controls the default behavior (CGROUP_MEM_RES_CTLR_SWAP_ENABLED). If the option is selected then the feature is turned on by default. It also adds a new boot parameter swapaccount[=1|0] which enhances the original noswapaccount parameter semantic by means of enable/disable logic (defaults to 1 if no value is provided to be still consistent with noswapaccount). The default behavior is unchanged (if CONFIG_CGROUP_MEM_RES_CTLR_SWAP is enabled then CONFIG_CGROUP_MEM_RES_CTLR_SWAP_ENABLED is enabled as well) Signed-off-by: Michal Hocko <mhocko@suse.cz> Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-25memcg: avoid deadlock between move charge and try_charge()Daisuke Nishimura
__mem_cgroup_try_charge() can be called under down_write(&mmap_sem)(e.g. mlock does it). This means it can cause deadlock if it races with move charge: Ex.1) move charge | try charge --------------------------------------+------------------------------ mem_cgroup_can_attach() | down_write(&mmap_sem) mc.moving_task = current | .. mem_cgroup_precharge_mc() | __mem_cgroup_try_charge() mem_cgroup_count_precharge() | prepare_to_wait() down_read(&mmap_sem) | if (mc.moving_task) -> cannot aquire the lock | -> true | schedule() Ex.2) move charge | try charge --------------------------------------+------------------------------ mem_cgroup_can_attach() | mc.moving_task = current | mem_cgroup_precharge_mc() | mem_cgroup_count_precharge() | down_read(&mmap_sem) | .. | up_read(&mmap_sem) | | down_write(&mmap_sem) mem_cgroup_move_task() | .. mem_cgroup_move_charge() | __mem_cgroup_try_charge() down_read(&mmap_sem) | prepare_to_wait() -> cannot aquire the lock | if (mc.moving_task) | -> true | schedule() To avoid this deadlock, we do all the move charge works (both can_attach() and attach()) under one mmap_sem section. And after this patch, we set/clear mc.moving_task outside mc.lock, because we use the lock only to check mc.from/to. Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-25memcg: fix false positive VM_BUG on non-SMPKirill A. Shutemov
Fix this: kernel BUG at mm/memcontrol.c:2155! invalid opcode: 0000 [#1] last sysfs file: Pid: 18, comm: sh Not tainted 2.6.37-rc3 #3 /Bochs EIP: 0060:[<c10731b2>] EFLAGS: 00000246 CPU: 0 EIP is at mem_cgroup_move_account+0xe2/0xf0 EAX: 00000004 EBX: c6f931d4 ECX: c681c300 EDX: c681c000 ESI: c681c300 EDI: ffffffea EBP: c681c000 ESP: c46f3e30 DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068 Process sh (pid: 18, ti=c46f2000 task=c6826e60 task.ti=c46f2000) Stack: 00000155 c681c000 0805f000 c46ee180 c46f3e5c c7058820 c1074d37 00000000 08060000 c46db9a0 c46ec080 c7058820 0805f000 08060000 c46f3e98 c1074c50 c106c75e c46f3e98 c46ec080 08060000 0805ffff c46db9a0 c46f3e98 c46e0340 Call Trace: [<c1074d37>] ? mem_cgroup_move_charge_pte_range+0xe7/0x130 [<c1074c50>] ? mem_cgroup_move_charge_pte_range+0x0/0x130 [<c106c75e>] ? walk_page_range+0xee/0x1d0 [<c10725d6>] ? mem_cgroup_move_task+0x66/0x90 [<c1074c50>] ? mem_cgroup_move_charge_pte_range+0x0/0x130 [<c1072570>] ? mem_cgroup_move_task+0x0/0x90 [<c1042616>] ? cgroup_attach_task+0x136/0x200 [<c1042878>] ? cgroup_tasks_write+0x48/0xc0 [<c1041e9e>] ? cgroup_file_write+0xde/0x220 [<c101398d>] ? do_page_fault+0x17d/0x3f0 [<c108a79d>] ? alloc_fd+0x2d/0xd0 [<c1041dc0>] ? cgroup_file_write+0x0/0x220 [<c1077ba2>] ? vfs_write+0x92/0xc0 [<c1077c81>] ? sys_write+0x41/0x70 [<c1140e3d>] ? syscall_call+0x7/0xb Code: 03 00 74 09 8b 44 24 04 e8 1c f1 ff ff 89 73 04 8d 86 b0 00 00 00 b9 01 00 00 00 89 da 31 ff e8 65 f5 ff ff e9 4d ff ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 90 8d b4 26 00 00 00 00 83 ec 10 8b 0d f4 e3 EIP: [<c10731b2>] mem_cgroup_move_account+0xe2/0xf0 SS:ESP 0068:c46f3e30 ---[ end trace 7daa1582159b6532 ]--- lock_page_cgroup and unlock_page_cgroup are implemented using bit_spinlock. bit_spinlock doesn't touch the bit if we are on non-SMP machine, so we can't use the bit to check whether the lock was taken. Let's introduce is_page_cgroup_locked based on bit_spin_is_locked instead of PageCgroupLocked to fix it. [akpm@linux-foundation.org: s/is_page_cgroup_locked/page_is_cgroup_locked/] Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujtisu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-25nommu: yield CPU while disposing VMSteven J. Magnani
Depending on processor speed, page size, and the amount of memory a process is allowed to amass, cleanup of a large VM may freeze the system for many seconds. This can result in a watchdog timeout. Make sure other tasks receive some service when cleaning up large VMs. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Cc: Greg Ungerer <gerg@snapgear.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-14Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6: slub: Fix slub_lock down/up imbalance
2010-11-14slub: Fix slub_lock down/up imbalancePavel Emelyanov
There are two places, that do not release the slub_lock. Respective bugs were introduced by sysfs changes ab4d5ed5 (slub: Enable sysfs support for !CONFIG_SLUB_DEBUG) and 2bce6485 ( slub: Allow removal of slab caches during boot). Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: Pekka Enberg <penberg@kernel.org>
2010-11-12radix-tree: fix RCU bugNick Piggin
Salman Qazi describes the following radix-tree bug: In the following case, we get can get a deadlock: 0. The radix tree contains two items, one has the index 0. 1. The reader (in this case find_get_pages) takes the rcu_read_lock. 2. The reader acquires slot(s) for item(s) including the index 0 item. 3. The non-zero index item is deleted, and as a consequence the other item is moved to the root of the tree. The place where it used to be is queued for deletion after the readers finish. 3b. The zero item is deleted, removing it from the direct slot, it remains in the rcu-delayed indirect node. 4. The reader looks at the index 0 slot, and finds that the page has 0 ref count 5. The reader looks at it again, hoping that the item will either be freed or the ref count will increase. This never happens, as the slot it is looking at will never be updated. Also, this slot can never be reclaimed because the reader is holding rcu_read_lock and is in an infinite loop. The fix is to re-use the same "indirect" pointer case that requires a slot lookup retry into a general "retry the lookup" bit. Signed-off-by: Nick Piggin <npiggin@kernel.dk> Reported-by: Salman Qazi <sqazi@google.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-12vmscan: avoid setting zone congested if no page dirtyShaohua Li
nr_dirty and nr_congested are increased only when the page is dirty. So if all pages are clean, both them will be zero. In this case, we should not mark the zone congested. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-12mm/vfs: revalidate page->mapping in do_generic_file_read()Dave Hansen
70 hours into some stress tests of a 2.6.32-based enterprise kernel, we ran into a NULL dereference in here: int block_is_partially_uptodate(struct page *page, read_descriptor_t *desc, unsigned long from) { ----> struct inode *inode = page->mapping->host; It looks like page->mapping was the culprit. (xmon trace is below). After closer examination, I realized that do_generic_file_read() does a find_get_page(), and eventually locks the page before calling block_is_partially_uptodate(). However, it doesn't revalidate the page->mapping after the page is locked. So, there's a small window between the find_get_page() and ->is_partially_uptodate() where the page could get truncated and page->mapping cleared. We _have_ a reference, so it can't get reclaimed, but it certainly can be truncated. I think the correct thing is to check page->mapping after the trylock_page(), and jump out if it got truncated. This patch has been running in the test environment for a month or so now, and we have not seen this bug pop up again. xmon info: 1f:mon> e cpu 0x1f: Vector: 300 (Data Access) at [c0000002ae36f770] pc: c0000000001e7a6c: .block_is_partially_uptodate+0xc/0x100 lr: c000000000142944: .generic_file_aio_read+0x1e4/0x770 sp: c0000002ae36f9f0 msr: 8000000000009032 dar: 0 dsisr: 40000000 current = 0xc000000378f99e30 paca = 0xc000000000f66300 pid = 21946, comm = bash 1f:mon> r R00 = 0025c0500000006d R16 = 0000000000000000 R01 = c0000002ae36f9f0 R17 = c000000362cd3af0 R02 = c000000000e8cd80 R18 = ffffffffffffffff R03 = c0000000031d0f88 R19 = 0000000000000001 R04 = c0000002ae36fa68 R20 = c0000003bb97b8a0 R05 = 0000000000000000 R21 = c0000002ae36fa68 R06 = 0000000000000000 R22 = 0000000000000000 R07 = 0000000000000001 R23 = c0000002ae36fbb0 R08 = 0000000000000002 R24 = 0000000000000000 R09 = 0000000000000000 R25 = c000000362cd3a80 R10 = 0000000000000000 R26 = 0000000000000002 R11 = c0000000001e7b60 R27 = 0000000000000000 R12 = 0000000042000484 R28 = 0000000000000001 R13 = c000000000f66300 R29 = c0000003bb97b9b8 R14 = 0000000000000001 R30 = c000000000e28a08 R15 = 000000000000ffff R31 = c0000000031d0f88 pc = c0000000001e7a6c .block_is_partially_uptodate+0xc/0x100 lr = c000000000142944 .generic_file_aio_read+0x1e4/0x770 msr = 8000000000009032 cr = 22000488 ctr = c0000000001e7a60 xer = 0000000020000000 trap = 300 dar = 0000000000000000 dsisr = 40000000 1f:mon> t [link register ] c000000000142944 .generic_file_aio_read+0x1e4/0x770 [c0000002ae36f9f0] c000000000142a14 .generic_file_aio_read+0x2b4/0x770 (unreliable) [c0000002ae36fb40] c0000000001b03e4 .do_sync_read+0xd4/0x160 [c0000002ae36fce0] c0000000001b153c .vfs_read+0xec/0x1f0 [c0000002ae36fd80] c0000000001b1768 .SyS_read+0x58/0xb0 [c0000002ae36fe30] c00000000000852c syscall_exit+0x0/0x40 --- Exception: c00 (System Call) at 00000080a840bc54 SP (fffca15df30) is in userspace 1f:mon> di c0000000001e7a6c c0000000001e7a6c e9290000 ld r9,0(r9) c0000000001e7a70 418200c0 beq c0000000001e7b30 # .block_is_partially_uptodate+0xd0/0x100 c0000000001e7a74 e9440008 ld r10,8(r4) c0000000001e7a78 78a80020 clrldi r8,r5,32 c0000000001e7a7c 3c000001 lis r0,1 c0000000001e7a80 812900a8 lwz r9,168(r9) c0000000001e7a84 39600001 li r11,1 c0000000001e7a88 7c080050 subf r0,r8,r0 c0000000001e7a8c 7f805040 cmplw cr7,r0,r10 c0000000001e7a90 7d6b4830 slw r11,r11,r9 c0000000001e7a94 796b0020 clrldi r11,r11,32 c0000000001e7a98 419d00a8 bgt cr7,c0000000001e7b40 # .block_is_partially_uptodate+0xe0/0x100 c0000000001e7a9c 7fa55840 cmpld cr7,r5,r11 c0000000001e7aa0 7d004214 add r8,r0,r8 c0000000001e7aa4 79080020 clrldi r8,r8,32 c0000000001e7aa8 419c0078 blt cr7,c0000000001e7b20 # .block_is_partially_uptodate+0xc0/0x100 Signed-off-by: Dave Hansen <dave@linux.vnet.ibm.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Reviewed-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Rik van Riel <riel@redhat.com> Cc: <arunabal@in.ibm.com> Cc: <sbest@us.ibm.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-12memcg: null dereference on allocation failureDan Carpenter
The original code had a null dereference if alloc_percpu() failed. This was introduced in commit 711d3d2c9bc3 ("memcg: cpu hotplug aware percpu count updates") Signed-off-by: Dan Carpenter <error27@gmail.com> Reviewed-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-09perf_events: Fix perf_counter_mmap() hook in mprotect()Pekka Enberg
As pointed out by Linus, commit dab5855 ("perf_counter: Add mmap event hooks to mprotect()") is fundamentally wrong as mprotect_fixup() can free 'vma' due to merging. Fix the problem by moving perf_event_mmap() hook to mprotect_fixup(). Note: there's another successful return path from mprotect_fixup() if old flags equal to new flags. We don't, however, need to call perf_event_mmap() there because 'perf' already knows the VMA is executable. Reported-by: Dave Jones <davej@redhat.com> Analyzed-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Ingo Molnar <mingo@elte.hu> Reviewed-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Pekka Enberg <penberg@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-03vmstat: fix offset calculation on void*Wu Fengguang
Fix regression introduced by commit 79da826aee6 ("writeback: report dirty thresholds in /proc/vmstat"). The incorrect pointer arithmetic can result in problems like this: BUG: unable to handle kernel paging request at 07c06d16 IP: [<c050c336>] strnlen+0x6/0x20 Call Trace: [<c050a249>] ? string+0x39/0xe0 [<c042be6b>] ? __wake_up_common+0x4b/0x80 [<c050afcc>] ? vsnprintf+0x1ec/0x380 [<c04b380e>] ? seq_printf+0x2e/0x60 [<c04829a6>] ? vmstat_show+0x26/0x30 [<c04b3bb6>] ? seq_read+0xa6/0x380 [<c04b3b10>] ? seq_read+0x0/0x380 [<c04d5d2f>] ? proc_reg_read+0x5f/0x90 [<c049c4a1>] ? vfs_read+0xa1/0x140 [<c04d5cd0>] ? proc_reg_read+0x0/0x90 [<c049c981>] ? sys_read+0x41/0x70 [<c0402bd0>] ? sysenter_do_call+0x12/0x26 Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> Cc: Michael Rubin <mrubin@google.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-02Release page reference during page fault retryMichel Lespinasse
This slipped by when unifying the filemap and swap versions of lock_page_or_retry()... Signed-off-by: Michel Lespinasse <walken@google.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-30audit mmapAl Viro
Normal syscall audit doesn't catch 5th argument of syscall. It also doesn't catch the contents of userland structures pointed to be syscall argument, so for both old and new mmap(2) ABI it doesn't record the descriptor we are mapping. For old one it also misses flags. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-29convert get_sb_nodev() usersAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2010-10-28numa: fix slab_node(MPOL_BIND)Eric Dumazet
When a node contains only HighMem memory, slab_node(MPOL_BIND) dereferences a NULL pointer. [ This code seems to go back all the way to commit 19770b32609b: "mm: filter based on a nodemask as well as a gfp_mask". Which was back in April 2008, and it got merged into 2.6.26. - Linus ] Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: Christoph Lameter <cl@linux.com> Cc: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-mn10300: (44 commits) MN10300: Save frame pointer in thread_info struct rather than global var MN10300: Change "Matsushita" to "Panasonic". MN10300: Create a defconfig for the ASB2364 board MN10300: Update the ASB2303 defconfig MN10300: ASB2364: Add support for SMSC911X and SMC911X MN10300: ASB2364: Handle the IRQ multiplexer in the FPGA MN10300: Generic time support MN10300: Specify an ELF HWCAP flag for MN10300 Atomic Operations Unit support MN10300: Map userspace atomic op regs as a vmalloc page MN10300: And Panasonic AM34 subarch and implement SMP MN10300: Delete idle_timestamp from irq_cpustat_t MN10300: Make various interrupt priority settings configurable MN10300: Optimise do_csum() MN10300: Implement atomic ops using atomic ops unit MN10300: Make the FPU operate in non-lazy mode under SMP MN10300: SMP TLB flushing MN10300: Use the [ID]PTEL2 registers rather than [ID]PTEL for TLB control MN10300: Make the use of PIDR to mark TLB entries controllable MN10300: Rename __flush_tlb*() to local_flush_tlb*() MN10300: AM34 erratum requires MMUCTR read and write on exception entry ...
2010-10-27fuse: use release_pages()Miklos Szeredi
Replace iterated page_cache_release() with release_pages(), which is faster and shorter. Needs release_pages() to be exported to modules. Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27memcg: generic filestat update interfaceKAMEZAWA Hiroyuki
This patch extracts the core logic from mem_cgroup_update_file_mapped() as mem_cgroup_update_file_stat() and adds a wrapper. As a planned future update, memory cgroup has to count dirty pages to implement dirty_ratio/limit. And more, the number of dirty pages is required to kick flusher thread to start writeback. (Now, no kick.) This patch is preparation for it and makes other statistics implementation clearer. Just a clean up. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Reviewed-by: Greg Thelen <gthelen@google.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27memcg: cpu hotplug aware quick acount_move detectionKAMEZAWA Hiroyuki
An event counter MEM_CGROUP_ON_MOVE is used for quick check whether file stat update can be done in async manner or not. Now, it use percpu counter and for_each_possible_cpu to update. This patch replaces for_each_possible_cpu to for_each_online_cpu and adds necessary synchronization logic at CPU HOTPLUG. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27memcg: cpu hotplug aware percpu count updatesKAMEZAWA Hiroyuki
Now, memcgroup's per cpu coutner uses for_each_possible_cpu() to get the value. It's better to use for_each_online_cpu() and a cpu hotplug handler. This patch only handles statistics counter. MEM_CGROUP_ON_MOVE will be handled in another patch. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27memcg: use for_each_mem_cgroupKAMEZAWA Hiroyuki
In memory cgroup management, we sometimes have to walk through subhierarchy of cgroup to gather informaiton, or lock something, etc. Now, to do that, mem_cgroup_walk_tree() function is provided. It calls given callback function per cgroup found. But the bad thing is that it has to pass a fixed style function and argument, "void*" and it adds much type casting to memcontrol.c. To make the code clean, this patch replaces walk_tree() with for_each_mem_cgroup_tree(iter, root) An iterator style call. The good point is that iterator call doesn't have to assume what kind of function is called under it. A bad point is that it may cause reference-count leak if a caller use "break" from the loop by mistake. I think the benefit is larger. The modified code seems straigtforward and easy to read because we don't have misterious callbacks and pointer cast. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27memcg: avoid lock in updating file_mapped (Was fix race in file_mapped ↵KAMEZAWA Hiroyuki
accouting flag management At accounting file events per memory cgroup, we need to find memory cgroup via page_cgroup->mem_cgroup. Now, we use lock_page_cgroup() for guarantee pc->mem_cgroup is not overwritten while we make use of it. But, considering the context which page-cgroup for files are accessed, we can use alternative light-weight mutual execusion in the most case. At handling file-caches, the only race we have to take care of is "moving" account, IOW, overwriting page_cgroup->mem_cgroup. (See comment in the patch) Unlike charge/uncharge, "move" happens not so frequently. It happens only when rmdir() and task-moving (with a special settings.) This patch adds a race-checker for file-cache-status accounting v.s. account moving. The new per-cpu-per-memcg counter MEM_CGROUP_ON_MOVE is added. The routine for account move 1. Increment it before start moving 2. Call synchronize_rcu() 3. Decrement it after the end of moving. By this, file-status-counting routine can check it needs to call lock_page_cgroup(). In most case, I doesn't need to call it. Following is a perf data of a process which mmap()/munmap 32MB of file cache in a minute. Before patch: 28.25% mmap mmap [.] main 22.64% mmap [kernel.kallsyms] [k] page_fault 9.96% mmap [kernel.kallsyms] [k] mem_cgroup_update_file_mapped 3.67% mmap [kernel.kallsyms] [k] filemap_fault 3.50% mmap [kernel.kallsyms] [k] unmap_vmas 2.99% mmap [kernel.kallsyms] [k] __do_fault 2.76% mmap [kernel.kallsyms] [k] find_get_page After patch: 30.00% mmap mmap [.] main 23.78% mmap [kernel.kallsyms] [k] page_fault 5.52% mmap [kernel.kallsyms] [k] mem_cgroup_update_file_mapped 3.81% mmap [kernel.kallsyms] [k] unmap_vmas 3.26% mmap [kernel.kallsyms] [k] find_get_page 3.18% mmap [kernel.kallsyms] [k] __do_fault 3.03% mmap [kernel.kallsyms] [k] filemap_fault 2.40% mmap [kernel.kallsyms] [k] handle_mm_fault 2.40% mmap [kernel.kallsyms] [k] do_page_fault This patch reduces memcg's cost to some extent. (mem_cgroup_update_file_mapped is called by both of map/unmap) Note: It seems some more improvements are required..but no idea. maybe removing set/unset flag is required. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27memcg: fix race in file_mapped accouting flag managementKAMEZAWA Hiroyuki
Presently memory cgroup accounts file-mapped by counter and flag. counter is working in the same way with zone_stat but FileMapped flag only exists in memcg (for helping move_account). This flag can be updated wrongly in a case. Assume CPU0 and CPU1 and a thread mapping a page on CPU0, another thread unmapping it on CPU1. CPU0 CPU1 rmv rmap (mapcount 1->0) add rmap (mapcount 0->1) lock_page_cgroup() memcg counter+1 (some delay) set MAPPED FLAG. unlock_page_cgroup() lock_page_cgroup() memcg counter-1 clear MAPPED flag In the above sequence counter is properly updated but FLAG is not. This means that representing a state by a flag which is maintained by counter needs some special care. To handle this, when clearing a flag, this patch check mapcount directly and clear the flag only when mapcount == 0. (if mapcount >0, someone will make it to zero later and flag will be cleared.) Reverse case, dec-after-inc cannot be a problem because page_table_lock() works well for it. (IOW, to make above sequence, 2 processes should touch the same page at once with map/unmap.) Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Greg Thelen <gthelen@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27mm,x86: fix kmap_atomic_push vs ioremap_32.cPeter Zijlstra
It appears i386 uses kmap_atomic infrastructure regardless of CONFIG_HIGHMEM which results in a compile error when highmem is disabled. Cure this by providing the needed few bits for both CONFIG_HIGHMEM and CONFIG_X86_32. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Reported-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-27MN10300: Save frame pointer in thread_info struct rather than global varDavid Howells
Save the current exception frame pointer in the thread_info struct rather than in a global variable as the latter makes SMP tricky, especially when preemption is also enabled. This also replaces __frame with current_frame() and rearranges header file inclusions to make it all compile. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
2010-10-26Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (52 commits) split invalidate_inodes() fs: skip I_FREEING inodes in writeback_sb_inodes fs: fold invalidate_list into invalidate_inodes fs: do not drop inode_lock in dispose_list fs: inode split IO and LRU lists fs: switch bdev inode bdi's correctly fs: fix buffer invalidation in invalidate_list fsnotify: use dget_parent smbfs: use dget_parent exportfs: use dget_parent fs: use RCU read side protection in d_validate fs: clean up dentry lru modification fs: split __shrink_dcache_sb fs: improve DCACHE_REFERENCED usage fs: use percpu counter for nr_dentry and nr_dentry_unused fs: simplify __d_free fs: take dcache_lock inside __d_path fs: do not assign default i_ino in new_inode fs: introduce a per-cpu last_ino allocator new helper: ihold() ...
2010-10-26kernel: remove PF_FLUSHERPeter Zijlstra
PF_FLUSHER is only ever set, not tested, remove it. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26use clear_page()/copy_page() in favor of memset()/memcpy() on whole pagesJan Beulich
After all that's what they are intended for. Signed-off-by: Jan Beulich <jbeulich@novell.com> Cc: Miklos Szeredi <miklos@szeredi.hu> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: "Rafael J. Wysocki" <rjw@sisk.pl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26replace nested max/min macros with {max,min}3 macroHagen Paul Pfeifer
Use the new {max,min}3 macros to save some cycles and bytes on the stack. This patch substitutes trivial nested macros with their counterpart. Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net> Cc: Joe Perches <joe@perches.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Hartley Sweeten <hsweeten@visionengravers.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Roland Dreier <rolandd@cisco.com> Cc: Sean Hefty <sean.hefty@intel.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: do_migrate_range: reduce list_empty() checkBob Liu
Simple code for reducing list_empty(&source) check. Signed-off-by: Bob Liu <lliubbo@gmail.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: do_migrate_range: exit loop if not_managed is trueBob Liu
If not_managed is true all pages will be putback to lru, so break the loop earlier to skip other pages isolate. Signed-off-by: Bob Liu <lliubbo@gmail.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: page_isolation: codeclean fix comment and rm unneeded val initBob Liu
__test_page_isolated_in_pageblock() returns 1 if all pages in the range are isolated, so fix the comment. Variable `pfn' will be initialised in the following loop so remove it. Signed-off-by: Bob Liu <lliubbo@gmail.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: fix is_mem_section_removable() page_order BUG_ON checkKAMEZAWA Hiroyuki
page_order() is called by memory hotplug's user interface to check the section is removable or not. (is_mem_section_removable()) It calls page_order() withoug holding zone->lock. So, even if the caller does if (PageBuddy(page)) ret = page_order(page) ... The caller may hit BUG_ON(). For fixing this, there are 2 choices. 1. add zone->lock. 2. remove BUG_ON(). is_mem_section_removable() is used for some "advice" and doesn't need to be 100% accurate. This is_removable() can be called via user program.. We don't want to take this important lock for long by user's request. So, this patch removes BUG_ON(). Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Acked-by: Michal Hocko <mhocko@suse.cz> Acked-by: Mel Gorman <mel@csn.ul.ie> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm/hugetlb.c: add missing spin_lock() to hugetlb_cow()Dean Nelson
Add missing spin_lock() of the page_table_lock before an error return in hugetlb_cow(). Callers of hugtelb_cow() expect it to be held upon return. Signed-off-by: Dean Nelson <dnelson@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: fix error reporting in move_pages() syscallGleb Natapov
The vma returned by find_vma does not necessarily include the target address. If this happens the code tries to follow a page outside of any vma and returns ENOENT instead of EFAULT. Signed-off-by: Gleb Natapov <gleb@redhat.com> Acked-by: Christoph Lameter <cl@linux-foundation.org> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26/proc/swaps: support pollingKay Sievers
System management wants to subscribe to changes in swap configuration. Make /proc/swaps pollable like /proc/mounts. [akpm@linux-foundation.org: document proc_poll_event] Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Greg KH <greg@kroah.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: add vzalloc() and vzalloc_node() helpersDave Young
Add vzalloc() and vzalloc_node() to encapsulate the vmalloc-then-memset-zero operation. Use __GFP_ZERO to zero fill the allocated memory. Signed-off-by: Dave Young <hidave.darkstar@gmail.com> Cc: Christoph Lameter <cl@linux-foundation.org> Acked-by: Greg Ungerer <gerg@snapgear.com> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm/memory_hotplug.c: make scan_lru_pages() staticAndrew Morton
Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26vmstat: include compaction.h when CONFIG_COMPACTIONNamhyung Kim
This removes following warning from sparse: mm/vmstat.c:466:5: warning: symbol 'fragmentation_index' was not declared. Should it be static? [akpm@linux-foundation.org: move the include to top-of-file] Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26vmalloc: annotate lock context change on s_start/stop()Namhyung Kim
s_start() and s_stop() grab/release vmlist_lock but were missing proper annotations. Add them. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26vmalloc: rename temporary variable in __insert_vmap_area()Namhyung Kim
Rename redundant 'tmp' to fix following sparse warnings: mm/vmalloc.c:296:34: warning: symbol 'tmp' shadows an earlier one mm/vmalloc.c:293:24: originally declared here Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26rmap: make anon_vma_chain_free() staticNamhyung Kim
Make anon_vma_chain_free() static. It is called only in rmap.c and the corresponding alloc function is already static. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26rmap: wrap page_check_address() using __cond_lock()Namhyung Kim
The page_check_address() conditionally grabs *@ptlp in case of returning non-NULL. Rename and wrap it using __cond_lock() removes following warnings from sparse: mm/rmap.c:472:9: warning: context imbalance in 'page_mapped_in_vma' - unexpected unlock mm/rmap.c:524:9: warning: context imbalance in 'page_referenced_one' - unexpected unlock mm/rmap.c:706:9: warning: context imbalance in 'page_mkclean_one' - unexpected unlock mm/rmap.c:1066:9: warning: context imbalance in 'try_to_unmap_one' - unexpected unlock Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26rmap: annotate lock context change on page_[un]lock_anon_vma()Namhyung Kim
The page_lock_anon_vma() conditionally grabs RCU and anon_vma lock but page_unlock_anon_vma() releases them unconditionally. This leads sparse to complain about context imbalance. Annotate them. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: wrap follow_pte() using __cond_lock()Namhyung Kim
The follow_pte() conditionally grabs *@ptlp in case of returning 0. Rename and wrap it using __cond_lock() removes following warnings: mm/memory.c:2337:9: warning: context imbalance in 'do_wp_page' - unexpected unlock mm/memory.c:3142:19: warning: context imbalance in 'handle_mm_fault' - different lock contexts for basic block Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: add lock release annotation on do_wp_page()Namhyung Kim
The do_wp_page() releases @ptl but was missing proper annotation. Add it. This removes following warnings from sparse: mm/memory.c:2337:9: warning: context imbalance in 'do_wp_page' - unexpected unlock mm/memory.c:3142:19: warning: context imbalance in 'handle_mm_fault' - different lock contexts for basic block Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-10-26mm: wrap get_locked_pte() using __cond_lock()Namhyung Kim
The get_locked_pte() conditionally grabs 'ptl' in case of returning non-NULL. This leads sparse to complain about context imbalance. Rename and wrap it using __cond_lock() to make sparse happy. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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