From: Stephen Boyd <sboyd@codeaurora.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Kevin Hilman <khilman@linaro.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-arch@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Ingo Molnar <mingo@elte.hu>,
Peter Zijlstra <peterz@infradead.org>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
Magnus Damm <magnus.damm@gmail.com>,
Russell King <linux@arm.linux.org.uk>
Subject: [PATCH] ARM: smp: Drop RCU_NONIDLE usage in cpu_die()
Date: Mon, 20 May 2013 17:57:16 -0700 [thread overview]
Message-ID: <1369097836-19756-1-git-send-email-sboyd@codeaurora.org> (raw)
In-Reply-To: <20130501005523.GN3780@linux.vnet.ibm.com>
Before f7b861b (arm: Use generic idle loop, 2013-03-21) ARM would
kill the CPU within the rcu idle section. Now that the
rcu_idle_enter()/exit() pair have been pushed lower down in the
idle loop this is no longer true and so using RCU_NONIDLE here is
no longer necessary and also harmful because RCU is not actually
idle at this point.
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
arch/arm/kernel/smp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 4619177..78f1eb5 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -233,7 +233,7 @@ void __ref cpu_die(void)
mb();
/* Tell __cpu_die() that this CPU is now safe to dispose of */
- RCU_NONIDLE(complete(&cpu_died));
+ complete(&cpu_died);
/*
* actual CPU shutdown procedure is at least platform (if not
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2013-05-21 0:57 UTC|newest]
Thread overview: 140+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-21 21:52 [patch 00/34] idle: Consolidate idle implementations Thomas Gleixner
2013-03-21 21:52 ` [patch 01/34] arch: Cleanup enable/disable_hlt Thomas Gleixner
2013-03-21 21:52 ` Thomas Gleixner
2013-03-21 21:52 ` [patch 02/34] arch: Consolidate tsk_is_polling() Thomas Gleixner
2013-03-21 21:52 ` Thomas Gleixner
2013-03-22 5:01 ` Tony Breeds
2013-03-22 5:20 ` Tony Breeds
2013-03-22 9:26 ` Thomas Gleixner
2013-03-21 21:52 ` [patch 03/34] idle: Implement set/clr functions for need_resched poll Thomas Gleixner
2013-03-21 21:52 ` Thomas Gleixner
2013-03-22 9:38 ` James Hogan
2013-03-21 21:52 ` [patch 04/34] idle: Provide a generic entry point for the idle code Thomas Gleixner
2013-03-21 21:52 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 06/34] arc: Use generic idle loop Thomas Gleixner
2013-03-22 9:02 ` Vineet Gupta
2013-03-21 21:53 ` [patch 05/34] idle: Implement generic idle function Thomas Gleixner
2013-03-23 8:56 ` Heiko Carstens
2013-03-25 10:39 ` Thomas Gleixner
2013-03-28 15:39 ` Srivatsa S. Bhat
2013-11-18 6:05 ` Viresh Kumar
2013-11-22 22:32 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 07/34] alpha: Use generic idle loop Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-28 15:37 ` Srivatsa S. Bhat
2013-03-29 11:22 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 08/34] arm: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-22 21:24 ` Kevin Hilman
2013-03-22 21:24 ` Kevin Hilman
2013-03-25 11:31 ` Thomas Gleixner
2013-03-25 11:48 ` Russell King - ARM Linux
2013-03-25 11:48 ` Russell King - ARM Linux
2013-03-25 14:02 ` Thomas Gleixner
2013-04-08 21:47 ` Russell King - ARM Linux
2013-04-09 9:20 ` Thomas Gleixner
2013-04-09 9:20 ` Thomas Gleixner
2013-04-09 9:38 ` Russell King - ARM Linux
2013-04-09 9:38 ` Russell King - ARM Linux
2013-04-25 20:03 ` Stephen Boyd
2013-04-25 21:01 ` Thomas Gleixner
2013-04-25 21:01 ` Thomas Gleixner
2013-05-01 0:49 ` Stephen Boyd
2013-05-01 0:55 ` Paul E. McKenney
2013-05-21 0:57 ` Stephen Boyd [this message]
2013-03-21 21:53 ` [patch 09/34] arm64: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-25 18:06 ` Catalin Marinas
2013-03-21 21:53 ` [patch 10/34] avr32: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 12/34] c6x: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 11/34] bfin: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 13/34] cris: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-27 15:04 ` Jesper Nilsson
2013-03-27 15:04 ` Jesper Nilsson
2013-03-27 17:10 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 14/34] frv: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 15/34] h8300: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 16/34] hexagon: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 17/34] ia64: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-28 15:40 ` Srivatsa S. Bhat
2013-03-28 15:40 ` Srivatsa S. Bhat
2013-03-21 21:53 ` [patch 18/34] m32r: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 19/34] m68k: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 20/34] metag: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-22 10:16 ` James Hogan
2013-03-25 11:26 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 21/34] microblaze: " Thomas Gleixner
2013-03-21 21:53 ` [patch 22/34] mips: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-28 15:42 ` Srivatsa S. Bhat
2013-03-28 15:42 ` Srivatsa S. Bhat
2013-03-21 21:53 ` [patch 24/34] openrisc: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 23/34] mn10300: " Thomas Gleixner
2013-03-21 21:53 ` [patch 25/34] parisc: " Thomas Gleixner
2013-03-21 21:53 ` [patch 26/34] powerpc: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-28 15:40 ` Srivatsa S. Bhat
2013-03-28 15:40 ` Srivatsa S. Bhat
2013-04-01 9:13 ` Deepthi Dharwar
2013-04-01 9:13 ` Deepthi Dharwar
2013-03-21 21:53 ` [patch 27/34] s390: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-23 9:38 ` Heiko Carstens
2013-03-23 9:38 ` Heiko Carstens
2013-03-23 9:39 ` Heiko Carstens
2013-03-21 21:53 ` [patch 28/34] score: " Thomas Gleixner
2013-03-21 21:53 ` [patch 30/34] tile: Enter idle with preemption disabled Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-22 20:34 ` Chris Metcalf
2013-03-22 20:40 ` Chris Metcalf
2013-03-28 15:43 ` Srivatsa S. Bhat
2013-03-28 15:43 ` Srivatsa S. Bhat
2013-03-21 21:53 ` [patch 29/34] sh: Use generic idle loop Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-28 15:40 ` Srivatsa S. Bhat
2013-03-21 21:53 ` [patch 31/34] tile: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-28 15:41 ` Srivatsa S. Bhat
2013-03-29 11:24 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 32/34] unicore: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-21 21:53 ` [patch 33/34] x86: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-28 15:43 ` Srivatsa S. Bhat
2013-03-28 15:43 ` Srivatsa S. Bhat
2013-03-21 21:53 ` [patch 34/34] xtensa: " Thomas Gleixner
2013-03-21 21:53 ` Thomas Gleixner
2013-03-22 12:37 ` Max Filippov
2013-03-22 12:37 ` Max Filippov
2013-03-22 20:09 ` [patch 00/34] idle: Consolidate idle implementations Sam Ravnborg
[not found] ` <alpine.LFD.2.02.1303271940150.22263@ionos>
[not found] ` <5153EC43.7070808@zankel.net>
2013-03-28 9:24 ` Thomas Gleixner
2013-03-28 22:16 ` Chris Zankel
2013-03-29 16:19 ` Sam Ravnborg
2013-03-29 16:19 ` Sam Ravnborg
2013-03-29 20:29 ` [PATCH] sparc: Use generic idle loop Sam Ravnborg
2013-03-31 23:46 ` David Miller
2013-04-01 6:53 ` Srivatsa S. Bhat
2013-04-01 6:53 ` Srivatsa S. Bhat
2013-04-01 9:06 ` Sam Ravnborg
2013-04-01 9:06 ` Sam Ravnborg
2013-04-08 12:33 ` Srivatsa S. Bhat
2013-04-08 12:33 ` Srivatsa S. Bhat
2013-04-08 17:10 ` Sam Ravnborg
2013-04-08 19:24 ` David Miller
2013-04-11 19:38 ` [PATCH v2] " Sam Ravnborg
2013-04-11 19:38 ` Sam Ravnborg
2013-04-12 18:56 ` Thomas Gleixner
2013-04-12 18:58 ` David Miller
2013-05-03 9:47 ` [patch 00/34] idle: Consolidate idle implementations Geert Uytterhoeven
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