The patch titled
Subject: ksm: validate STABLE_NODE_DUP_HEAD conditional to gcc version
has been added to the -mm tree. Its filename is
ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-3.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-3.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-3.patch
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------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: ksm: validate STABLE_NODE_DUP_HEAD conditional to gcc version
BUILD_BUG_ON can only validate this successfully on recent gcc.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/ksm.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/ksm.c~ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-3 mm/ksm.c
--- a/mm/ksm.c~ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-3
+++ a/mm/ksm.c
@@ -629,8 +629,10 @@ static void remove_node_from_stable_tree
* from &migrate_nodes. This will verify that future list.h changes
* don't break STABLE_NODE_DUP_HEAD.
*/
+#if GCC_VERSION >= 40903 /* only recent gcc can handle it */
BUILD_BUG_ON(STABLE_NODE_DUP_HEAD <= &migrate_nodes);
BUILD_BUG_ON(STABLE_NODE_DUP_HEAD >= &migrate_nodes + 1);
+#endif
if (stable_node->head == &migrate_nodes)
list_del(&stable_node->list);
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit.patch
ksm-introduce-ksm_max_page_sharing-per-page-deduplication-limit-fix-3.patch
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