KAMEZAWA Hiroyuki 9e7814404b hold task->mempolicy while numa_maps scans. ... /proc/<pid>/numa_maps scans vma and show mempolicy under mmap_sem. It sometimes accesses task->mempolicy which can be freed without mmap_sem and numa_maps can show some garbage while scanning. This patch tries to take reference count of task->mempolicy at reading numa_maps before calling get_vma_policy(). By this, task->mempolicy will not be freed until numa_maps reaches its end. V2->v3 - updated comments to be more verbose. - removed task_lock() in numa_maps code. V1->V2 - access task->mempolicy only once and remember it. Becase kernel/exit.c can overwrite it. Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: David Rientjes <rientjes@google.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-10-19 14:32:10 -07:00
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lockd	NLM: nlm_lookup_file() may return NLMv4-specific error codes	2012-10-17 10:14:14 -04:00
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proc	hold task->mempolicy while numa_maps scans.	2012-10-19 14:32:10 -07:00
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xattr.c	fs, xattr: fix bug when removing a name not in xattr list	2012-10-18 12:35:58 -07:00