From cf99abace7e07dd8491e7093a9a9ef11d48838ed Mon Sep 17 00:00:00 2001
From: Andrea Arcangeli <andrea@cpushare.com>
Date: Sun, 15 Jul 2007 23:41:33 -0700
Subject: make seccomp zerocost in schedule

This follows a suggestion from Chuck Ebbert on how to make seccomp
absolutely zerocost in schedule too.  The only remaining footprint of
seccomp is in terms of the bzImage size that becomes a few bytes (perhaps
even a few kbytes) larger, measure it if you care in the embedded.

Signed-off-by: Andrea Arcangeli <andrea@cpushare.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 kernel/seccomp.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'kernel/seccomp.c')

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 1dfa8a50972..ad64fcb731f 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -74,6 +74,9 @@ long prctl_set_seccomp(unsigned long seccomp_mode)
 	if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
 		current->seccomp.mode = seccomp_mode;
 		set_thread_flag(TIF_SECCOMP);
+#ifdef TIF_NOTSC
+		disable_TSC();
+#endif
 		ret = 0;
 	}
 
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