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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-11 13:34:26 +0300
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 21:15:02 +0300
commit2de0db992de189fccc83fed57c30875144821491 (patch)
tree138ea29f99e5e5ebb4c304da1961cdf0731a8b36 /kernel
parent6b27aef09fea32b805a8c81287b1bb80362dadb0 (diff)
downloadlinux-2de0db992de189fccc83fed57c30875144821491.tar.xz
mm: use do_futex() instead of sys_futex() in mm_release()
sys_futex() is a wrapper to do_futex() which does not modify any values here: - uaddr, val and val3 are kept the same - op is masked with FUTEX_CMD_MASK, but is always set to FUTEX_WAKE. Therefore, val2 is always 0. - as utime is set to NULL, *timeout is NULL This patch is part of a series which removes in-kernel calls to syscalls. On this basis, the syscall entry path can be streamlined. For details, see http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Darren Hart <dvhart@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/fork.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index e5d9d405ae4e..b1e031aac9db 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1198,8 +1198,8 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
* not set up a proper pointer then tough luck.
*/
put_user(0, tsk->clear_child_tid);
- sys_futex(tsk->clear_child_tid, FUTEX_WAKE,
- 1, NULL, NULL, 0);
+ do_futex(tsk->clear_child_tid, FUTEX_WAKE,
+ 1, NULL, NULL, 0, 0);
}
tsk->clear_child_tid = NULL;
}