Messages in this thread Patch in this message | | | Date | Mon, 15 Jun 2009 10:45:22 +0800 | From | Wu Fengguang <> | Subject | [PATCH 02/22] HWPOISON: Export some rmap vma locking to outside world |
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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>
--- include/linux/rmap.h | 6 ++++++ mm/rmap.c | 4 ++-- 2 files changed, 8 insertions(+), 2 deletions(-)
--- sound-2.6.orig/include/linux/rmap.h +++ sound-2.6/include/linux/rmap.h @@ -116,6 +116,12 @@ int try_to_munlock(struct page *); int page_wrprotect(struct page *page, int *odirect_sync, int count_offset); #endif +/* + * 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) --- sound-2.6.orig/mm/rmap.c +++ sound-2.6/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(); --
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