Subject: [merged] mm-fix-sleeping-function-warning-from-__put_anon_vma.patch removed from -mm tree
To: hughd@xxxxxxxxxx,davej@xxxxxxxxxx,peterz@xxxxxxxxxxxxx,stable@xxxxxxxxxxxxxxx,mm-commits@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Thu, 05 Jun 2014 12:41:57 -0700
The patch titled
Subject: mm: fix sleeping function warning from __put_anon_vma
has been removed from the -mm tree. Its filename was
mm-fix-sleeping-function-warning-from-__put_anon_vma.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Hugh Dickins <hughd@xxxxxxxxxx>
Subject: mm: fix sleeping function warning from __put_anon_vma
Trinity reports BUG:
sleeping function called from invalid context at kernel/locking/rwsem.c:47
in_atomic(): 0, irqs_disabled(): 0, pid: 5787, name: trinity-c27
__might_sleep < down_write < __put_anon_vma < page_get_anon_vma <
migrate_pages < compact_zone < compact_zone_order < try_to_compact_pages ..
Right, since conversion to mutex then rwsem, we should not put_anon_vma()
from inside an rcu_read_lock()ed section: fix the two places that did so.
And add might_sleep() to anon_vma_free(), as suggested by Peter Zijlstra.
Fixes: 88c22088bf23 ("mm: optimize page_lock_anon_vma() fast-path")
Reported-by: Dave Jones <davej@xxxxxxxxxx>
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/rmap.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff -puN mm/rmap.c~mm-fix-sleeping-function-warning-from-__put_anon_vma mm/rmap.c
--- a/mm/rmap.c~mm-fix-sleeping-function-warning-from-__put_anon_vma
+++ a/mm/rmap.c
@@ -103,6 +103,7 @@ static inline void anon_vma_free(struct
* LOCK should suffice since the actual taking of the lock must
* happen _before_ what follows.
*/
+ might_sleep();
if (rwsem_is_locked(&anon_vma->root->rwsem)) {
anon_vma_lock_write(anon_vma);
anon_vma_unlock_write(anon_vma);
@@ -426,8 +427,9 @@ struct anon_vma *page_get_anon_vma(struc
* above cannot corrupt).
*/
if (!page_mapped(page)) {
+ rcu_read_unlock();
put_anon_vma(anon_vma);
- anon_vma = NULL;
+ return NULL;
}
out:
rcu_read_unlock();
@@ -477,9 +479,9 @@ struct anon_vma *page_lock_anon_vma_read
}
if (!page_mapped(page)) {
+ rcu_read_unlock();
put_anon_vma(anon_vma);
- anon_vma = NULL;
- goto out;
+ return NULL;
}
/* we pinned the anon_vma, its safe to sleep */
_
Patches currently in -mm which might be from hughd@xxxxxxxxxx are
origin.patch
linux-next.patch
memcg-mm-introduce-lowlimit-reclaim.patch
memcg-mm-introduce-lowlimit-reclaim-fix.patch
memcg-mm-introduce-lowlimit-reclaim-fix2patch.patch
memcg-allow-setting-low_limit.patch
memcg-doc-clarify-global-vs-limit-reclaims.patch
memcg-doc-clarify-global-vs-limit-reclaims-fix.patch
memcg-document-memorylow_limit_in_bytes.patch
vmscan-memcg-check-whether-the-low-limit-should-be-ignored.patch
vmscan-memcg-always-use-swappiness-of-the-reclaimed-memcg-swappiness-and-o-om-control-fixpatch.patch
mm-replace-remap_file_pages-syscall-with-emulation-fix-3.patch
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