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Subject[patch 14/45] fix undefined reference to user_shm_unlock
2.6.31-stable review patch.  If anyone has any objections, please let us know.

From: Hugh Dickins <>

commit 2195d2818c37bdf263865f1e9effccdd9fc5f9d4 upstream.

My 353d5c30c666580347515da609dd74a2b8e9b828 "mm: fix hugetlb bug due to
user_shm_unlock call" broke the CONFIG_SYSVIPC !CONFIG_MMU build of both
2.6.31 and "undefined reference to `user_shm_unlock'".

gcc didn't understand my comment! so couldn't figure out to optimize
away user_shm_unlock() from the error path in the hugetlb-less case, as
it does elsewhere. Help it to do so, in a language it understands.

Reported-by: Mike Frysinger <>
Signed-off-by: Hugh Dickins <>
Signed-off-by: Linus Torvalds <>
Signed-off-by: Greg Kroah-Hartman <>

ipc/shm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -410,7 +410,7 @@ static int newseg(struct ipc_namespace *
return error;

- if (shp->mlock_user) /* shmflg & SHM_HUGETLB case */
+ if (is_file_hugepages(file) && shp->mlock_user)
user_shm_unlock(size, shp->mlock_user);

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