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Date: Thu, 11 Oct 2012 07:52:15 +0900 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, alan@...rguk.ukuu.org.uk, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Frederic Weisbecker <fweisbec@...il.com>, Hirokazu Takata <takata@...ux-m32r.org>, Josh Triplett <josh@...htriplett.org> Subject: [ 109/133] m32r: Add missing RCU idle APIs on idle loop 3.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Frederic Weisbecker <fweisbec@...il.com> commit 48ae077cfce72591b8fc80e1dcc87806f86fed7f upstream. In the old times, the whole idle task was considered as an RCU quiescent state. But as RCU became more and more successful overtime, some RCU read side critical section have been added even in the code of some architectures idle tasks, for tracing for example. So nowadays, rcu_idle_enter() and rcu_idle_exit() must be called by the architecture to tell RCU about the part in the idle loop that doesn't make use of rcu read side critical sections, typically the part that puts the CPU in low power mode. This is necessary for RCU to find the quiescent states in idle in order to complete grace periods. Add this missing pair of calls in the m32r's idle loop. Reported-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> Cc: Hirokazu Takata <takata@...ux-m32r.org> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@...htriplett.org> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/m32r/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) --- a/arch/m32r/kernel/process.c +++ b/arch/m32r/kernel/process.c @@ -26,6 +26,7 @@ #include <linux/ptrace.h> #include <linux/unistd.h> #include <linux/hardirq.h> +#include <linux/rcupdate.h> #include <asm/io.h> #include <asm/uaccess.h> @@ -82,6 +83,7 @@ void cpu_idle (void) { /* endless idle loop with no priority at all */ while (1) { + rcu_idle_enter(); while (!need_resched()) { void (*idle)(void) = pm_idle; @@ -90,6 +92,7 @@ void cpu_idle (void) idle(); } + rcu_idle_exit(); schedule_preempt_disabled(); } } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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