linux-kernel - [PATCH 1/1] kernel core: use helpers for rlimits fix

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Message-Id: <1265831948-7873-1-git-send-email-jslaby@suse.cz>
Date:	Wed, 10 Feb 2010 20:59:08 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 1/1] kernel core: use helpers for rlimits fix

This is unmerged part of
kernel-core-use-helpers-for-rlimits.patch

Please amend.

--

Make sure compiler won't do weird things with limits. E.g. fetching
them twice may return 2 different values after writable limits are
implemented.

I.e. either use rlimit helpers added in
3e10e716abf3c71bdb5d86b8f507f9e72236c9cd
or ACCESS_ONCE if not applicable.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 kernel/fork.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/fork.c b/kernel/fork.c
index 11a84db..13ec487 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -828,12 +828,14 @@ void __cleanup_sighand(struct sighand_struct *sighand)
  */
 static void posix_cpu_timers_init_group(struct signal_struct *sig)
 {
+	unsigned long cpu_limit;
+
 	/* Thread group counters. */
 	thread_group_cputime_init(sig);
 
-	if (sig->rlim[RLIMIT_CPU].rlim_cur != RLIM_INFINITY) {
-		sig->cputime_expires.prof_exp =
-			secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
+	cpu_limit = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur);
+	if (cpu_limit != RLIM_INFINITY) {
+		sig->cputime_expires.prof_exp = secs_to_cputime(cpu_limit);
 		sig->cputimer.running = 1;
 	}
 
-- 
1.6.6.1

--
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