From: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Date: Sat, 12 Sep 2009 11:21:27 +0000 (+0100)
Subject: fix undefined reference to user_shm_unlock
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2195d2818c37bdf263865f1e9effccdd9fc5f9d4;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

fix undefined reference to user_shm_unlock

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 2.6.30.6: "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 <vapier@gentoo.org>
Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/ipc/shm.c b/ipc/shm.c
index 1bc4701ef4f..30162a59621 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -410,7 +410,7 @@ static int newseg(struct ipc_namespace *ns, struct ipc_params *params)
 	return error;
 
 no_id:
-	if (shp->mlock_user)	/* shmflg & SHM_HUGETLB case */
+	if (is_file_hugepages(file) && shp->mlock_user)
 		user_shm_unlock(size, shp->mlock_user);
 	fput(file);
 no_file: