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Message-Id: <20090529213528.7E5A41D0291@basil.firstfloor.org>
Date: Fri, 29 May 2009 23:35:28 +0200 (CEST)
From: Andi Kleen <andi@...stfloor.org>
To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, fengguang.wu@...el.com
Subject: [PATCH] [3/16] 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@...ux.intel.com>
---
include/linux/rmap.h | 6 ++++++
mm/rmap.c | 4 ++--
2 files changed, 8 insertions(+), 2 deletions(-)
Index: linux/include/linux/rmap.h
===================================================================
--- linux.orig/include/linux/rmap.h 2009-05-29 23:32:10.000000000 +0200
+++ linux/include/linux/rmap.h 2009-05-29 23:33:30.000000000 +0200
@@ -118,6 +118,12 @@
}
#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)
Index: linux/mm/rmap.c
===================================================================
--- linux.orig/mm/rmap.c 2009-05-29 23:32:10.000000000 +0200
+++ linux/mm/rmap.c 2009-05-29 23:33:30.000000000 +0200
@@ -191,7 +191,7 @@
* 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 @@
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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