hrtimer: don't modify restart_block->fn in restart functions

hrtimer_nanosleep_restart() clears/restores restart_block->fn. This is
pointless and complicates its usage. Note that if sys_restart_syscall()
doesn't actually happen, we have a bogus "pending" restart->fn anyway,
this is harmless.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Alexey Dobriyan <adobriyan@sw.ru>
Cc: Pavel Emelyanov <xemul@sw.ru>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Toyo Abe <toyoa@mvista.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 0 insertions, 4 deletions

diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 355085f0896e..3f4a57c7895d 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1340,8 +1340,6 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
         struct hrtimer_sleeper t;
         struct timespec __user  *rmtp;
 
-        restart->fn = do_no_restart_syscall;
-
         hrtimer_init(&t.timer, restart->arg0, HRTIMER_MODE_ABS);
         t.timer.expires.tv64 = ((u64)restart->arg3 << 32) | (u64) restart->arg2;
 
@@ -1355,8 +1353,6 @@ long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
                         return ret;
         }
 
-        restart->fn = hrtimer_nanosleep_restart;
-
         /* The other values in restart are already filled in */
         return -ERESTART_RESTARTBLOCK;
 }