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rmap: anon_vma_prepare: Reduce code duplication by calling anon_vma_chain_link

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Reduce code duplication by calling anon_vma_chain_link() from
anon_vma_prepare().

Also move anon_vmal_chain_link() to a more suitable location in the file.

Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Hugh Dickins <hughd@google.com>
Reviewed-by: KAMEZWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kautuk Consul 2012-03-21 16:34:01 -07:00 committed by Linus Torvalds
parent 28073b02bf
commit 6583a84304
1 changed files with 16 additions and 19 deletions
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35
mm/rmap.c
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@ -120,6 +120,21 @@ static void anon_vma_chain_free(struct anon_vma_chain *anon_vma_chain)
kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain); kmem_cache_free(anon_vma_chain_cachep, anon_vma_chain);
} }
static void anon_vma_chain_link(struct vm_area_struct *vma,
struct anon_vma_chain *avc,
struct anon_vma *anon_vma)
{
avc->vma = vma;
avc->anon_vma = anon_vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
/*
* It's critical to add new vmas to the tail of the anon_vma,
* see comment in huge_memory.c:__split_huge_page().
*/
list_add_tail(&avc->same_anon_vma, &anon_vma->head);
}
/** /**
* anon_vma_prepare - attach an anon_vma to a memory region * anon_vma_prepare - attach an anon_vma to a memory region
* @vma: the memory region in question * @vma: the memory region in question
@ -175,10 +190,7 @@ int anon_vma_prepare(struct vm_area_struct *vma)
spin_lock(&mm->page_table_lock); spin_lock(&mm->page_table_lock);
if (likely(!vma->anon_vma)) { if (likely(!vma->anon_vma)) {
vma->anon_vma = anon_vma; vma->anon_vma = anon_vma;
avc->anon_vma = anon_vma; anon_vma_chain_link(vma, avc, anon_vma);
avc->vma = vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
list_add_tail(&avc->same_anon_vma, &anon_vma->head);
allocated = NULL; allocated = NULL;
avc = NULL; avc = NULL;
} }
@ -224,21 +236,6 @@ static inline void unlock_anon_vma_root(struct anon_vma *root)
mutex_unlock(&root->mutex); mutex_unlock(&root->mutex);
} }
static void anon_vma_chain_link(struct vm_area_struct *vma,
struct anon_vma_chain *avc,
struct anon_vma *anon_vma)
{
avc->vma = vma;
avc->anon_vma = anon_vma;
list_add(&avc->same_vma, &vma->anon_vma_chain);
/*
* It's critical to add new vmas to the tail of the anon_vma,
* see comment in huge_memory.c:__split_huge_page().
*/
list_add_tail(&avc->same_anon_vma, &anon_vma->head);
}
/* /*
* Attach the anon_vmas from src to dst. * Attach the anon_vmas from src to dst.
* Returns 0 on success, -ENOMEM on failure. * Returns 0 on success, -ENOMEM on failure.