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Subject[RFC PATCH 03/35] syscalls: mm_release(): use do_futex() instead of sys_futex()
Date
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

CC: Thomas Gleixner <tglx@linutronix.de>
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>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
kernel/fork.c | 4 ++--
1 file 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;
}
--
2.16.2
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