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>
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@ -112,6 +112,12 @@ int page_mkclean(struct page *);
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*/
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int try_to_munlock(struct page *);
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/*
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* Called by memory-failure.c to kill processes.
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*/
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struct anon_vma *page_lock_anon_vma(struct page *page);
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void page_unlock_anon_vma(struct anon_vma *anon_vma);
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#else /* !CONFIG_MMU */
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#define anon_vma_init() do {} while (0)
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@ -191,7 +191,7 @@ void __init anon_vma_init(void)
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* Getting a lock on a stable anon_vma from a page off the LRU is
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* tricky: page_lock_anon_vma rely on RCU to guard against the races.
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*/
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static struct anon_vma *page_lock_anon_vma(struct page *page)
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struct anon_vma *page_lock_anon_vma(struct page *page)
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{
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struct anon_vma *anon_vma;
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unsigned long anon_mapping;
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@ -211,7 +211,7 @@ out:
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return NULL;
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}
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static void page_unlock_anon_vma(struct anon_vma *anon_vma)
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void page_unlock_anon_vma(struct anon_vma *anon_vma)
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{
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spin_unlock(&anon_vma->lock);
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rcu_read_unlock();
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