linux-kernel - Re: [PATCH 3/8] x86,kgdb: Implement early hardware breakpoint debugging

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Message-ID: <20100225235822.GE5592@nowhere>
Date:	Fri, 26 Feb 2010 00:58:24 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	kgdb-bugreport@...ts.sourceforge.net, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 3/8] x86,kgdb: Implement early hardware breakpoint
	debugging

On Thu, Feb 25, 2010 at 03:22:01PM -0600, Jason Wessel wrote:
> It is not possible to use the hw_breakpoint.c API prior to mm_init(),
> but it is possible to use hardware breakpoints with the kernel
> debugger.
> 
> Prior to smp_init() it is possible to simply write to the dr registers
> of the boot cpu directly.  This can be used up until the
> kgdb_arch_late() is invoked, at which point the standard hw_breakpoint.c
> API will get used.
> 
> CC: Frederic Weisbecker <fweisbec@...il.com>
> CC: Ingo Molnar <mingo@...e.hu>
> Signed-off-by: Jason Wessel <jason.wessel@...driver.com>
> ---


That looks good to me at a quick glance.

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