[PATCH 3/4] perf_event: Make perf fd non seekable

[Frederic Weisbecker <fweisbec@gmail.com>]

From: Arnd Bergmann <arnd@relay.de.ibm.com>

Perf_event does not need seeking, so prevent it in order to
get rid of default_llseek, which uses the BKL.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Ingo Molnar <mingo@elte.hu>
[drop the nonseekable_open, not needed for anon inodes]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
---
 kernel/perf_event.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 63fbce1..4aa50ff 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -2645,6 +2645,7 @@ static int perf_fasync(int fd, struct file *filp, int on)
 }
 
 static const struct file_operations perf_fops = {
+	.llseek			= no_llseek,
 	.release		= perf_release,
 	.read			= perf_read,
 	.poll			= perf_poll,
-- 
1.6.2.3