linux-kernel - Re: [Kgdb-bugreport] [PATCH 4/5] kgdb: Use atomic operators whichuse barriers

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Date:	Fri, 2 Apr 2010 12:47:23 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Jason Wessel <jason.wessel@...driver.com>
cc:	kgdb-bugreport@...ts.sourceforge.net,
	Will Deacon <will.deacon@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	linux-arm@...r.kernel.org
Subject: Re: [Kgdb-bugreport] [PATCH 4/5] kgdb: Use atomic operators whichuse
 barriers



On Fri, 2 Apr 2010, Jason Wessel wrote:
> 
> Here is the revised patch, which is going into the kgdb-fixes branch.

Yeah, this patch I have no issues with.

Except:

> From: Jason Wessel <jason.wessel@...driver.com>
> Subject: [PATCH] kgdb: Use atomic operators which use barriers
> 
> The cpu_relax() does not mandate that there is an smp memory barrier.
> As a result on the arm smp architecture the kernel debugger can hang
> on entry from time to time, as shown by the kgdb regression tests.

Now your changelog makes no sense any more.

		Linus
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