Liu Ping Fan 1ae71d0319 mm: numa: bugfix for LAST_CPUPID_NOT_IN_PAGE_FLAGS ... When doing some numa tests on powerpc, I triggered an oops bug. I find it is caused by using page->_last_cpupid. It should be initialized as "-1 & LAST_CPUPID_MASK", but not "-1". Otherwise, in task_numa_fault(), we will miss the checking (last_cpupid == (-1 & LAST_CPUPID_MASK)). And finally cause an oops bug in task_numa_group(), since the online cpu is less than possible cpu. This happen with CONFIG_SPARSE_VMEMMAP disabled Call trace: SMP NR_CPUS=64 NUMA PowerNV Modules linked in: CPU: 24 PID: 804 Comm: systemd-udevd Not tainted3.13.0-rc1+ #32 task: c000001e2746aa80 ti: c000001e32c50000 task.ti:c000001e32c50000 REGS: c000001e32c53510 TRAP: 0300 Not tainted(3.13.0-rc1+) MSR: 9000000000009032 <SF,HV,EE,ME,IR,DR,RI> CR:28024424 XER: 20000000 CFAR: c000000000009324 DAR: 7265717569726857 DSISR:40000000 SOFTE: 1 NIP .task_numa_fault+0x1470/0x2370 LR .task_numa_fault+0x1468/0x2370 Call Trace: .task_numa_fault+0x1468/0x2370 (unreliable) .do_numa_page+0x480/0x4a0 .handle_mm_fault+0x4ec/0xc90 .do_page_fault+0x3a8/0x890 handle_page_fault+0x10/0x30 Instruction dump: 3c82fefb 3884b138 48d9cff1 60000000 48000574 3c62fefb3863af78 3c82fefb 3884b138 48d9cfd5 60000000 e93f0100 <812902e4> 7d2907b45529063e 7d2a07b4 ---[ end trace 15f2510da5ae07cf ]--- Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> 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>		2014-03-04 07:55:50 -08:00
..
acpi	Merge branches 'acpi-processor', 'acpi-hotplug', 'acpi-init', 'acpi-pm' and 'acpica'	2014-01-29 11:47:18 +01:00
asm-generic	mm: Use ptep/pmdp_set_numa() for updating _PAGE_NUMA bit	2014-02-17 11:19:36 +11:00
clocksource
crypto
drm	Merge tag 'ttm-fixes-3.14-2014-02-18' of git://people.freedesktop.org/~thomash/linux into drm-fixes	2014-02-19 08:21:26 +10:00
dt-bindings	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc	2014-01-30 17:07:18 -08:00
keys
kvm
linux	mm: numa: bugfix for LAST_CPUPID_NOT_IN_PAGE_FLAGS	2014-03-04 07:55:50 -08:00
math-emu	math-emu: fix floating-point to integer overflow detection	2014-01-07 18:36:24 -06:00
media	[media] saa6588: add support for non-blocking mode	2014-01-07 07:42:19 -02:00
memory
misc
net	net: sctp: Fix a_rwnd/rwnd management to reflect real state of the receiver's buffer	2014-02-17 00:16:56 -05:00
pcmcia
ras
rdma	IB: Report using RoCE IP based gids in port caps	2014-02-13 14:46:03 -08:00
rxrpc
scsi	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2014-01-31 15:31:23 -08:00
sound	ASoC: dapm: Add locking to snd_soc_dapm_xxxx_pin functions	2014-02-20 18:40:07 +09:00
target	target: Simplify command completion by removing CMD_T_FAILED flag	2014-02-12 15:14:30 -08:00
trace	Revert "writeback: do not sync data dirtied after sync start"	2014-02-22 02:02:28 +01:00
uapi	asm-generic: add sched_setattr/sched_getattr syscalls	2014-02-24 11:55:20 +00:00
video	video: pxa168fb: Cleanup pxa168fb.h file	2014-01-17 10:57:43 +02:00
xen	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2014-02-14 10:45:18 -08:00
Kbuild