linux-kernel - Re: [PATCH 4/5] kgdb: Use atomic operators which use barriers

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Message-ID: <20100402222516.GA11073@n2100.arm.linux.org.uk>
Date:	Fri, 2 Apr 2010 23:25:16 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	Will Deacon <will.deacon@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	kgdb-bugreport@...ts.sourceforge.net, linux-arm@...r.kernel.org
Subject: Re: [PATCH 4/5] kgdb: Use atomic operators which use barriers

On Fri, Apr 02, 2010 at 12:43:00PM -0700, Linus Torvalds wrote:
> Russell is wrong.

Actually, in future threads you end up agreeing with my position...

> The fact that maybe some ARM6 cache coherency implementation is pure and 
> utter sh*t and never sees the changes without the same instruction that 
> happens to be a memory barrier on that architecture does not make that 
> cpu_relax() any more about memory barriers.

I'm not going to discuss it now; I'm on holiday.  Wait until mid-next
week on this and I'll respond with a fuller reply.
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