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: Kautuk Consul <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Cc: Hugh Dickins <[email protected]>
Reviewed-by: KAMEZWA Hiroyuki <[email protected]>
Cc: Mel Gorman <[email protected]>
Acked-by: David Rientjes <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/mm/rmap.c b/mm/rmap.c
index 78cc46b..ebeb95e 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -120,6 +120,21 @@
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 @@
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 @@
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.
