RE: [PATCH] Add call to non-crashing cores through IPI

From: Santosh Shilimkar <santosh.shilimkar@ti.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Per Fransson <per.fransson.ml@gmail.com>,
	Mika Westerberg <mika.westerberg@iki.fi>,
	kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org
Subject: RE: [PATCH] Add call to non-crashing cores through IPI
Date: Mon, 22 Nov 2010 22:55:46 +0530	[thread overview]
Message-ID: <bdbc2959fe609090afc0fb6d656e36de@mail.gmail.com> (raw)
In-Reply-To: <20101122142101.GL31227@n2100.arm.linux.org.uk>

> -----Original Message-----
> From: Russell King - ARM Linux [mailto:linux@arm.linux.org.uk]
> Sent: Monday, November 22, 2010 7:51 PM
> To: Santosh Shilimkar
> Cc: Per Fransson; Mika Westerberg; kexec@lists.infradead.org; linux-arm-
> kernel@lists.infradead.org
> Subject: Re: [PATCH] Add call to non-crashing cores through IPI
>
> On Mon, Nov 22, 2010 at 06:37:09PM +0530, Santosh Shilimkar wrote:
> > > ARM: smp: make smp_send_stop() wait for secondary CPUs to stop
> > >
> > > Wait up to one second for secondary CPUs to respond to a request to
> > > stop.  This avoids the sender CPU continuing and possibly destroying
> > > state before the recipients have had a chance to respond to the
stop.
> > > However, if the recipients have crashed, we won't hang the sender
> > > CPU indefinitely.
> > >
> > Just tried this patch thinking it might fix the reboot issue
> > reported earlier. But it doesn't help.
>
> I was hoping that it might change the behaviour slightly, but if not
> the patch can't do any harm.
>
> The reboot stuff works fine on Versatile Express with Cortex A9, so
> I suspect your problem might be specific to OMAP.
Interesting.
I thought it's a common issue. Will have a look at it more
closely

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