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| author | Andi Kleen <andi@firstfloor.org> | 2009-09-16 11:50:04 +0200 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2009-09-16 11:50:04 +0200 |
| commit | 10be22dfe1e6ad978269dc275147e0ed049187bb (patch) | |
| tree | d00418a59d9de0aadd092559d92f0d348d87a4b1 | |
| parent | d466f2fcb32cd97fd586bfa33f5dba3ac78aadb0 (diff) | |
| download | lwn-10be22dfe1e6ad978269dc275147e0ed049187bb.tar.gz lwn-10be22dfe1e6ad978269dc275147e0ed049187bb.zip | |
HWPOISON: Export some rmap vma locking to outside world
Needed for later patch that walks rmap entries on its own.
This used to be very frowned upon, but memory-failure.c does
some rather specialized rmap walking and rmap has been stable
for quite some time, so I think it's ok now to export it.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
| -rw-r--r-- | include/linux/rmap.h | 6 | ||||
| -rw-r--r-- | mm/rmap.c | 4 |
2 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/rmap.h b/include/linux/rmap.h index bf116d0dbf23..8dff2ffab82c 100644 --- a/include/linux/rmap.h +++ b/include/linux/rmap.h @@ -112,6 +112,12 @@ int page_mkclean(struct page *); */ int try_to_munlock(struct page *); +/* + * Called by memory-failure.c to kill processes. + */ +struct anon_vma *page_lock_anon_vma(struct page *page); +void page_unlock_anon_vma(struct anon_vma *anon_vma); + #else /* !CONFIG_MMU */ #define anon_vma_init() do {} while (0) diff --git a/mm/rmap.c b/mm/rmap.c index 0895b5c7cbff..5a35c030e779 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -191,7 +191,7 @@ void __init anon_vma_init(void) * Getting a lock on a stable anon_vma from a page off the LRU is * tricky: page_lock_anon_vma rely on RCU to guard against the races. */ -static struct anon_vma *page_lock_anon_vma(struct page *page) +struct anon_vma *page_lock_anon_vma(struct page *page) { struct anon_vma *anon_vma; unsigned long anon_mapping; @@ -211,7 +211,7 @@ out: return NULL; } -static void page_unlock_anon_vma(struct anon_vma *anon_vma) +void page_unlock_anon_vma(struct anon_vma *anon_vma) { spin_unlock(&anon_vma->lock); rcu_read_unlock(); |