tree c616838802ec09df2c3283b32d91e786c0ea622d
parent 19073084ce0ae63d69d84628315a90e84cf801cc
author Dimitri Sivanich <sivanich@sgi.com> 1245785824 -0700
committer Greg Kroah-Hartman <gregkh@suse.de> 1246578058 -0700

mm: fix handling of pagesets for downed cpus

commit 364df0ebfbbb1330bfc6ca159f4d6020efc15a12 upstream.

After downing/upping a cpu, an attempt to set
/proc/sys/vm/percpu_pagelist_fraction results in an oops in
percpu_pagelist_fraction_sysctl_handler().

If a processor is downed then we need to set the pageset pointer back to
the boot pageset.

Updates of the high water marks should not access pagesets of unpopulated
zones (those pointer go to the boot pagesets which would be no longer
functional if their size would be increased beyond zero).

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>