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mm: migration: clarify migrate_pages() comment

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Callers of migrate_pages should putback_lru_pages to return pages
isolated to LRU or free list.  Now comment is rather confusing.  It says
caller always have to call it.

It is more clear to point out that the caller has to call it if
migrate_pages's return value isn't zero.

Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2011-01-25 15:07:26 -08:00 committed by Linus Torvalds
parent 33a938774f
commit 28bd65781c
1 changed files with 1 additions and 1 deletions
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mm/migrate.c
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@ -888,7 +888,7 @@ out:
* are movable anymore because to has become empty * are movable anymore because to has become empty
* or no retryable pages exist anymore. * or no retryable pages exist anymore.
* Caller should call putback_lru_pages to return pages to the LRU * Caller should call putback_lru_pages to return pages to the LRU
* or free list. * or free list only if ret != 0.
* *
* Return: Number of pages not migrated or error code. * Return: Number of pages not migrated or error code.
*/ */