The patch titled
Subject: mm-put_and_wait_on_page_locked-while-page-is-migrated-fix
has been added to the -mm tree. Its filename is
mm-put_and_wait_on_page_locked-while-page-is-migrated-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-put_and_wait_on_page_locked-while-page-is-migrated-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-put_and_wait_on_page_locked-while-page-is-migrated-fix.patch
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------------------------------------------------------
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Subject: mm-put_and_wait_on_page_locked-while-page-is-migrated-fix
add put_and_wait_on_page_locked() kerneldoc
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Herrmann <dh.herrmann@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Nick Piggin <npiggin@xxxxxxxxx>,
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/filemap.c~mm-put_and_wait_on_page_locked-while-page-is-migrated-fix
+++ a/mm/filemap.c
@@ -1175,6 +1175,16 @@ int wait_on_page_bit_killable(struct pag
}
EXPORT_SYMBOL(wait_on_page_bit_killable);
+/**
+ * put_and_wait_on_page_locked - Drop a reference and wait for it to be unlocked
+ * @page: The page to wait for.
+ *
+ * The caller should hold a reference on @page. They expect the page to
+ * become unlocked relatively soon, but do not wish to hold up migration
+ * (for example) by holding the reference while waiting for the page to
+ * come unlocked. After this function returns, the caller should not
+ * dereference @page.
+ */
void put_and_wait_on_page_locked(struct page *page)
{
wait_queue_head_t *q;
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-put_and_wait_on_page_locked-while-page-is-migrated-fix.patch
fls-change-parameter-to-unsigned-int.patch
