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Commit 6583a843 authored by Kautuk Consul's avatar Kautuk Consul Committed by Linus Torvalds
Browse files

rmap: anon_vma_prepare: Reduce code duplication by calling anon_vma_chain_link 



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: default avatarKautuk Consul <consul.kautuk@gmail.com>
Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Hugh Dickins <hughd@google.com>
Reviewed-by: default avatarKAMEZWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 28073b02

mm/rmap.c

+16 −19
Original line number Diff line number Diff line
@@ -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);

}



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

 * @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);

		if (likely(!vma->anon_vma)) {

			vma->anon_vma = anon_vma;

			avc->anon_vma = anon_vma;

			avc->vma = vma;

			list_add(&avc->same_vma, &vma->anon_vma_chain);

			list_add_tail(&avc->same_anon_vma, &anon_vma->head);

			anon_vma_chain_link(vma, avc, anon_vma);

			allocated = NULL;

			avc = NULL;

		}
@@ -224,21 +236,6 @@ static inline void unlock_anon_vma_root(struct anon_vma *root) 
		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.

 * Returns 0 on success, -ENOMEM on failure.