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| author | Hugh Dickins <hughd@google.com> | 2012-06-02 00:27:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-06-03 20:05:47 -0700 |
| commit | 752dc185dacba1edcba425e67fc6df3c7793a5c3 (patch) | |
| tree | a2e05a91cff7d1549ba5fcaa3f583339db3412f1 /mm | |
| parent | 2f9d3df8aa1cc3c6db5cfa0bad3f0745e04cc27d (diff) | |
| download | lwn-752dc185dacba1edcba425e67fc6df3c7793a5c3.tar.gz lwn-752dc185dacba1edcba425e67fc6df3c7793a5c3.zip | |
mm: fix warning in __set_page_dirty_nobuffers
New tmpfs use of !PageUptodate pages for fallocate() is triggering the
WARNING: at mm/page-writeback.c:1990 when __set_page_dirty_nobuffers()
is called from migrate_page_copy() for compaction.
It is anomalous that migration should use __set_page_dirty_nobuffers()
on an address_space that does not participate in dirty and writeback
accounting; and this has also been observed to insert surprising dirty
tags into a tmpfs radix_tree, despite tmpfs not using tags at all.
We should probably give migrate_page_copy() a better way to preserve the
tag and migrate accounting info, when mapping_cap_account_dirty(). But
that needs some more work: so in the interim, avoid the warning by using
a simple SetPageDirty on PageSwapBacked pages.
Reported-and-tested-by: Dave Jones <davej@redhat.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/migrate.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index ab81d482ae6f..be26d5cbe56b 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -436,7 +436,10 @@ void migrate_page_copy(struct page *newpage, struct page *page) * is actually a signal that all of the page has become dirty. * Whereas only part of our page may be dirty. */ - __set_page_dirty_nobuffers(newpage); + if (PageSwapBacked(page)) + SetPageDirty(newpage); + else + __set_page_dirty_nobuffers(newpage); } mlock_migrate_page(newpage, page); |