linux-kernel - Re: mips; boot fail after merge 3.9+

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Date:	Thu, 2 May 2013 12:42:08 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jonas Gorski <jogo@...nwrt.org>
cc:	eunb.song@...sung.com, "ralf@...ux-mips.org" <ralf@...ux-mips.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: mips; boot fail after merge 3.9+

On Thu, 2 May 2013, Jonas Gorski wrote:

> On Wed, May 1, 2013 at 6:57 AM, EUNBONG SONG <eunb.song@...sung.com> wrote:
> >
> > Hello.
> > After merge cavium board boots fail, boot log messages are as follows.
> > I enabled initcall_debug for debugging.
> 
> I can confirm that MIPS does not seem to finish to boot after using
> the generic idle loop, I have the same problem on a different platform
> (bcm63xx), and bisecting showed the same commit.
> 
> (snip)
> 
> > I found this issue after cdbedc61c8d0122ad682815936f0d11df1fe5f57.
> > And i found something strange. I ran the git show for this commit.
> > As below "select GENERIC_IDLE_LOOP" is added for CONFIG_MIPS.
> > but the latest arch/mips/Kconfig file has not this one. I have tried to find when this is gone. but i can't find.
> > Is there any problem with this?
> 
> No, after all architectures were converted to use the generic idle
> loop the config symbol was removed, so it's now always on. The problem
> is rather that the generic idle loop does not seem to work on MIPS.
> Unfortunately due to limited knowledge in this area I can't really
> tell which part broke it.

Does the patch below fix your issue ?

Thanks,

	tglx

diff --git a/kernel/cpu/idle.c b/kernel/cpu/idle.c
index 8b86c0c..a8972fe 100644
--- a/kernel/cpu/idle.c
+++ b/kernel/cpu/idle.c
@@ -70,8 +70,10 @@ static void cpu_idle_loop(void)
 			check_pgt_cache();
 			rmb();
 
-			if (cpu_is_offline(smp_processor_id()))
+			if (cpu_is_offline(smp_processor_id())) {
 				arch_cpu_idle_dead();
+				continue;
+			}
 
 			local_irq_disable();
 			arch_cpu_idle_enter();
--
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