linux-kernel - Re: [PATCH] lktdm: Bring support for hardlockup, softlockup and hung task crashes

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Message-ID: <20100516104603.GF5133@lenovo>
Date:	Sun, 16 May 2010 14:46:03 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Simon Kagstrom <simon.kagstrom@...insight.net>,
	Ingo Molnar <mingo@...e.hu>, Don Zickus <dzickus@...hat.com>
Subject: Re: [PATCH] lktdm: Bring support for hardlockup, softlockup and
	hung task crashes

On Sun, May 16, 2010 at 12:35:08PM +0200, Frederic Weisbecker wrote:
...
> > Looks good to me. Btw perhaps we may simplify it a bit:
> > 
> > 	case HARDLOCKUP:
> > 		local_irq_disable();
> > 	case SOFTLOCKUP:
> > 		preempt_disable();
> > 		for (;;)
> > 			cpu_relax();
> > 		break;
> > 
> > since it'll save a few bytes. What do you think? Did I miss
> > something?
> 
> 
> It would make the code a bit less clear in that people
> might stick on the reason to disable preemption after disabling
> irq, especially with a code that already does something rather
> unusual ;)
> 

ok, convinced

	-- Cyrill
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