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| author | Mel Gorman <mgorman@suse.de> | 2014-01-23 15:53:38 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-23 16:36:53 -0800 |
| commit | 6c14466cc00ff13121ae782d33d9df0fde20b124 (patch) | |
| tree | 65cf09a45f47de60638fdd1fe3140f9b8bdc27b9 /lib/crc32defs.h | |
| parent | 0eef615665ede1e0d603ea9ecca88c1da6f02234 (diff) | |
| download | op-kernel-dev-6c14466cc00ff13121ae782d33d9df0fde20b124.zip op-kernel-dev-6c14466cc00ff13121ae782d33d9df0fde20b124.tar.gz | |
mm: improve documentation of page_order
Developers occasionally try and optimise PFN scanners by using
page_order but miss that in general it requires zone->lock. This has
happened twice for compaction.c and rejected both times. This patch
clarifies the documentation of page_order and adds a note to
compaction.c why page_order is not used.
[akpm@linux-foundation.org: tweaks]
[lauraa@codeaurora.org: Corrected a page_zone(page)->lock reference]
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rafael Aquini <aquini@redhat.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Laura Abbott <lauraa@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/crc32defs.h')
0 files changed, 0 insertions, 0 deletions
