| Message ID | 13498287181261@kroah.org (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
--- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -48,6 +48,7 @@ #include <linux/unistd.h> #include <linux/kallsyms.h> #include <linux/uaccess.h> +#include <linux/rcupdate.h> #include <asm/io.h> #include <asm/asm-offsets.h> @@ -69,8 +70,10 @@ void cpu_idle(void) /* endless idle loop with no priority at all */ while (1) { + rcu_idle_enter(); while (!need_resched()) barrier(); + rcu_idle_exit(); schedule_preempt_disabled(); check_pgt_cache(); }
This is a note to let you know that I've just added the patch titled parisc: Add missing RCU idle APIs on idle loop to the 3.5-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: parisc-add-missing-rcu-idle-apis-on-idle-loop.patch and it can be found in the queue-3.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@vger.kernel.org> know about it. From fbe752188d5589e7fcbb8e79824e560f77dccc92 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker <fweisbec@gmail.com> Date: Wed, 22 Aug 2012 17:27:34 +0200 Subject: parisc: Add missing RCU idle APIs on idle loop From: Frederic Weisbecker <fweisbec@gmail.com> commit fbe752188d5589e7fcbb8e79824e560f77dccc92 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 parisc's idle loop. Reported-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Parisc <linux-parisc@vger.kernel.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- arch/parisc/kernel/process.c | 3 +++ 1 file changed, 3 insertions(+) Patches currently in stable-queue which might be from fweisbec@gmail.com are queue-3.5/frv-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/cris-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/m68k-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/alpha-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/h8300-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/parisc-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/m32r-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/score-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/mn10300-add-missing-rcu-idle-apis-on-idle-loop.patch queue-3.5/xtensa-add-missing-rcu-idle-apis-on-idle-loop.patch -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html