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Subject[PATCH 2/2] rmap: anon_vma_prepare: Reduce code duplication by calling anon_vma_chain_link
Date
Reduce code duplication by calling anon_vma_chain_link from
anon_vma_prepare.

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

Signed-off-by: Kautuk Consul <consul.kautuk@gmail.com>
---
mm/rmap.c | 35 ++++++++++++++++-------------------
1 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/mm/rmap.c b/mm/rmap.c
index 74aff97..4df80bb 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -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.
--
1.7.5.4


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