linux-kernel - RE: [RFC][PATCH -next] pstore: replace spin_lock with spin_trylock

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Message-ID: <5C4C569E8A4B9B42A84A977CF070A35B2C5700CA5D@USINDEVS01.corp.hds.com>
Date:	Wed, 28 Sep 2011 14:55:16 -0400
From:	Seiji Aguchi <seiji.aguchi@....com>
To:	Don Zickus <dzickus@...hat.com>
CC:	"Luck, Tony" <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>,
	Matthew Garrett <mjg@...hat.com>,
	"Chen, Gong" <gong.chen@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: RE: [RFC][PATCH -next] pstore: replace spin_lock with
 spin_trylock_irqsave in panic path

Hi Don,

>[reads the kernel/panic.c code] oh, I see this already exists, you would
>just move the smp_send_stop() command up a couple lines of code.
>
>[Side note] perhaps we should change the behaviour of smp_send_stop to use
>NMI and create a blacklist of machines to use the IRQ line instead.  I
>assume the list of broken machines is small as Red Hat has been kdumping
>kernels since 2.6.18 with little evidence that machines were failing
>because NMI wasn't working properly.

OK. I will develop a patch in accordance with your comment above.
In addition to that, I have to improve mtdoops/ramoops because
There are some blocking codes in them.

Seiji
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