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Commit 10be22df authored by Andi Kleen's avatar Andi Kleen Committed by Andi Kleen
Browse files

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: default avatarAndi Kleen <ak@linux.intel.com>
parent d466f2fc

include/linux/rmap.h

+6 −0
Original line number Diff line number Diff line
@@ -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)

mm/rmap.c

+2 −2
Original line number Diff line number Diff line
@@ -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();