From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756108AbaJ1LK6 (ORCPT ); Tue, 28 Oct 2014 07:10:58 -0400 Received: from terminus.zytor.com ([198.137.202.10]:51238 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750903AbaJ1LK4 (ORCPT ); Tue, 28 Oct 2014 07:10:56 -0400 Date: Tue, 28 Oct 2014 04:09:59 -0700 From: tip-bot for Peter Zijlstra Message-ID: Cc: tglx@linutronix.de, hpa@zytor.com, linux-kernel@vger.kernel.org, peterz@infradead.org, mingo@kernel.org, torvalds@linux-foundation.org, oleg@redhat.com Reply-To: tglx@linutronix.de, linux-kernel@vger.kernel.org, peterz@infradead.org, hpa@zytor.com, mingo@kernel.org, torvalds@linux-foundation.org, oleg@redhat.com In-Reply-To: <20140924082242.119255706@infradead.org> References: <20140924082242.119255706@infradead.org> To: linux-tip-commits@vger.kernel.org Subject: [tip:sched/core] sched/wait: Add might_sleep() checks Git-Commit-ID: e22b886a8a43b147e1994a9f970f678fc0df2033 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: e22b886a8a43b147e1994a9f970f678fc0df2033 Gitweb: http://git.kernel.org/tip/e22b886a8a43b147e1994a9f970f678fc0df2033 Author: Peter Zijlstra AuthorDate: Wed, 24 Sep 2014 10:18:48 +0200 Committer: Ingo Molnar CommitDate: Tue, 28 Oct 2014 10:55:23 +0100 sched/wait: Add might_sleep() checks Add more might_sleep() checks, suppose someone put a wait_event() like thing in a wait loop.. Can't put might_sleep() in ___wait_event() because there's the locked primitives which call ___wait_event() with locks held. Signed-off-by: Peter Zijlstra (Intel) Cc: tglx@linutronix.de Cc: ilya.dryomov@inktank.com Cc: umgwanakikbuti@gmail.com Cc: Oleg Nesterov Cc: Linus Torvalds Link: http://lkml.kernel.org/r/20140924082242.119255706@infradead.org Signed-off-by: Ingo Molnar --- include/linux/wait.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/wait.h b/include/linux/wait.h index fc0e993..0421775 100644 --- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -261,6 +261,7 @@ __out: __ret; \ */ #define wait_event(wq, condition) \ do { \ + might_sleep(); \ if (condition) \ break; \ __wait_event(wq, condition); \ @@ -293,6 +294,7 @@ do { \ #define wait_event_timeout(wq, condition, timeout) \ ({ \ long __ret = timeout; \ + might_sleep(); \ if (!___wait_cond_timeout(condition)) \ __ret = __wait_event_timeout(wq, condition, timeout); \ __ret; \ @@ -318,6 +320,7 @@ do { \ */ #define wait_event_cmd(wq, condition, cmd1, cmd2) \ do { \ + might_sleep(); \ if (condition) \ break; \ __wait_event_cmd(wq, condition, cmd1, cmd2); \ @@ -345,6 +348,7 @@ do { \ #define wait_event_interruptible(wq, condition) \ ({ \ int __ret = 0; \ + might_sleep(); \ if (!(condition)) \ __ret = __wait_event_interruptible(wq, condition); \ __ret; \ @@ -378,6 +382,7 @@ do { \ #define wait_event_interruptible_timeout(wq, condition, timeout) \ ({ \ long __ret = timeout; \ + might_sleep(); \ if (!___wait_cond_timeout(condition)) \ __ret = __wait_event_interruptible_timeout(wq, \ condition, timeout); \ @@ -428,6 +433,7 @@ do { \ #define wait_event_hrtimeout(wq, condition, timeout) \ ({ \ int __ret = 0; \ + might_sleep(); \ if (!(condition)) \ __ret = __wait_event_hrtimeout(wq, condition, timeout, \ TASK_UNINTERRUPTIBLE); \ @@ -453,6 +459,7 @@ do { \ #define wait_event_interruptible_hrtimeout(wq, condition, timeout) \ ({ \ long __ret = 0; \ + might_sleep(); \ if (!(condition)) \ __ret = __wait_event_hrtimeout(wq, condition, timeout, \ TASK_INTERRUPTIBLE); \ @@ -466,6 +473,7 @@ do { \ #define wait_event_interruptible_exclusive(wq, condition) \ ({ \ int __ret = 0; \ + might_sleep(); \ if (!(condition)) \ __ret = __wait_event_interruptible_exclusive(wq, condition);\ __ret; \ @@ -640,6 +648,7 @@ do { \ #define wait_event_killable(wq, condition) \ ({ \ int __ret = 0; \ + might_sleep(); \ if (!(condition)) \ __ret = __wait_event_killable(wq, condition); \ __ret; \ @@ -891,6 +900,7 @@ extern int bit_wait_io_timeout(struct wait_bit_key *); static inline int wait_on_bit(void *word, int bit, unsigned mode) { + might_sleep(); if (!test_bit(bit, word)) return 0; return out_of_line_wait_on_bit(word, bit, @@ -915,6 +925,7 @@ wait_on_bit(void *word, int bit, unsigned mode) static inline int wait_on_bit_io(void *word, int bit, unsigned mode) { + might_sleep(); if (!test_bit(bit, word)) return 0; return out_of_line_wait_on_bit(word, bit, @@ -941,6 +952,7 @@ wait_on_bit_io(void *word, int bit, unsigned mode) static inline int wait_on_bit_action(void *word, int bit, wait_bit_action_f *action, unsigned mode) { + might_sleep(); if (!test_bit(bit, word)) return 0; return out_of_line_wait_on_bit(word, bit, action, mode); @@ -968,6 +980,7 @@ wait_on_bit_action(void *word, int bit, wait_bit_action_f *action, unsigned mode static inline int wait_on_bit_lock(void *word, int bit, unsigned mode) { + might_sleep(); if (!test_and_set_bit(bit, word)) return 0; return out_of_line_wait_on_bit_lock(word, bit, bit_wait, mode); @@ -991,6 +1004,7 @@ wait_on_bit_lock(void *word, int bit, unsigned mode) static inline int wait_on_bit_lock_io(void *word, int bit, unsigned mode) { + might_sleep(); if (!test_and_set_bit(bit, word)) return 0; return out_of_line_wait_on_bit_lock(word, bit, bit_wait_io, mode); @@ -1016,6 +1030,7 @@ wait_on_bit_lock_io(void *word, int bit, unsigned mode) static inline int wait_on_bit_lock_action(void *word, int bit, wait_bit_action_f *action, unsigned mode) { + might_sleep(); if (!test_and_set_bit(bit, word)) return 0; return out_of_line_wait_on_bit_lock(word, bit, action, mode); @@ -1034,6 +1049,7 @@ wait_on_bit_lock_action(void *word, int bit, wait_bit_action_f *action, unsigned static inline int wait_on_atomic_t(atomic_t *val, int (*action)(atomic_t *), unsigned mode) { + might_sleep(); if (atomic_read(val) == 0) return 0; return out_of_line_wait_on_atomic_t(val, action, mode);