Jan Kara 08142579b6 mm: fix assertion mapping->nrpages == 0 in end_writeback() ... Under heavy memory and filesystem load, users observe the assertion mapping->nrpages == 0 in end_writeback() trigger. This can be caused by page reclaim reclaiming the last page from a mapping in the following race: CPU0 CPU1 ... shrink_page_list() __remove_mapping() __delete_from_page_cache() radix_tree_delete() evict_inode() truncate_inode_pages() truncate_inode_pages_range() pagevec_lookup() - finds nothing end_writeback() mapping->nrpages != 0 -> BUG page->mapping = NULL mapping->nrpages-- Fix the problem by doing a reliable check of mapping->nrpages under mapping->tree_lock in end_writeback(). Analyzed by Jay <jinshan.xiong@whamcloud.com>, lost in LKML, and dug out by Miklos Szeredi <mszeredi@suse.de>. Cc: Jay <jinshan.xiong@whamcloud.com> Cc: Miklos Szeredi <mszeredi@suse.de> Signed-off-by: Jan Kara <jack@suse.cz> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2011-06-27 18:00:13 -07:00
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acpi	Merge branches 'acpica', 'aml-custom', 'bugzilla-16548', 'bugzilla-20242', 'd3-cold', 'ec-asus' and 'thermal-fix' into release	2011-05-29 04:38:48 -04:00
asm-generic	Merge branches 'gpio/merge' and 'spi/merge' of git://git.secretlab.ca/git/linux-2.6	2011-06-17 10:36:32 -07:00
crypto
drm	drm/radeon: workaround a hw bug on some radeon chipsets with all-0 EDIDs.	2011-06-16 16:30:54 +10:00
keys
linux	mm: fix assertion mapping->nrpages == 0 in end_writeback()	2011-06-27 18:00:13 -07:00
math-emu
media	[media] v4l: Fix media_entity_to_video_device macro argument name	2011-06-01 09:42:03 -03:00
mtd
net	Fix some kernel-doc warnings	2011-06-27 16:06:19 -07:00
pcmcia
rdma
rxrpc
scsi
sound	ASoC: Remove unused and about to be broken SND_SOC_CUSTOM I/O bus	2011-06-13 19:17:55 +01:00
target
trace	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4	2011-06-21 10:22:35 -07:00
video
xen
Kbuild