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authorMichel Lespinasse <walken@google.com>2012-10-08 16:31:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-10-09 16:22:42 +0900
commited8ea8150182f8d715fceb3b175ef0a9ebacd872 (patch)
tree3af48f3a947df4dc5a0df660988f61d454a88cf2 /mm/interval_tree.c
parent86c2ad19956f84f2191e062fcb979367b6365871 (diff)
downloadlinux-stericsson-ed8ea8150182f8d715fceb3b175ef0a9ebacd872.tar.gz
mm: add CONFIG_DEBUG_VM_RB build option
Add a CONFIG_DEBUG_VM_RB build option for the previously existing DEBUG_MM_RB code. Now that Andi Kleen modified it to avoid using recursive algorithms, we can expose it a bit more. Also extend this code to validate_mm() after stack expansion, and to check that the vma's start and last pgoffs have not changed since the nodes were inserted on the anon vma interval tree (as it is important that the nodes be reindexed after each such update). Signed-off-by: Michel Lespinasse <walken@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Daniel Santos <daniel.santos@pobox.com> Cc: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/interval_tree.c')
-rw-r--r--mm/interval_tree.c41
1 files changed, 40 insertions, 1 deletions
diff --git a/mm/interval_tree.c b/mm/interval_tree.c
index f7c72cd35e1d..4a5822a586e6 100644
--- a/mm/interval_tree.c
+++ b/mm/interval_tree.c
@@ -70,4 +70,43 @@ static inline unsigned long avc_last_pgoff(struct anon_vma_chain *avc)
}
INTERVAL_TREE_DEFINE(struct anon_vma_chain, rb, unsigned long, rb_subtree_last,
- avc_start_pgoff, avc_last_pgoff,, anon_vma_interval_tree)
+ avc_start_pgoff, avc_last_pgoff,
+ static inline, __anon_vma_interval_tree)
+
+void anon_vma_interval_tree_insert(struct anon_vma_chain *node,
+ struct rb_root *root)
+{
+#ifdef CONFIG_DEBUG_VM_RB
+ node->cached_vma_start = avc_start_pgoff(node);
+ node->cached_vma_last = avc_last_pgoff(node);
+#endif
+ __anon_vma_interval_tree_insert(node, root);
+}
+
+void anon_vma_interval_tree_remove(struct anon_vma_chain *node,
+ struct rb_root *root)
+{
+ __anon_vma_interval_tree_remove(node, root);
+}
+
+struct anon_vma_chain *
+anon_vma_interval_tree_iter_first(struct rb_root *root,
+ unsigned long first, unsigned long last)
+{
+ return __anon_vma_interval_tree_iter_first(root, first, last);
+}
+
+struct anon_vma_chain *
+anon_vma_interval_tree_iter_next(struct anon_vma_chain *node,
+ unsigned long first, unsigned long last)
+{
+ return __anon_vma_interval_tree_iter_next(node, first, last);
+}
+
+#ifdef CONFIG_DEBUG_VM_RB
+void anon_vma_interval_tree_verify(struct anon_vma_chain *node)
+{
+ WARN_ON_ONCE(node->cached_vma_start != avc_start_pgoff(node));
+ WARN_ON_ONCE(node->cached_vma_last != avc_last_pgoff(node));
+}
+#endif