linux-kernel - Re: [RFC Patch 2/2][Bugfix][x86][hw-breakpoint] Fix return-code to notifier chain in hw_breakpoint

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Date:	Thu, 31 Dec 2009 01:44:47 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Alan Stern <stern@...land.harvard.edu>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC Patch 2/2][Bugfix][x86][hw-breakpoint] Fix return-code to
	notifier chain in hw_breakpoint_handler

On Sat, Dec 26, 2009 at 11:58:33PM +0530, K.Prasad wrote:
> +		/*
> +		 * Further processing in do_debug() is needed for a) user-space
> +		 * breakpoints (to generate signals) and b) when the system has
> +		 * taken exception due to multiple causes
> +		 */
> +		if (bp->attr.bp_addr < TASK_SIZE)
> +			rc = NOTIFY_DONE;



BTW, I'm not sure this is the right way to check if we want to send
a signal or not. Although it's not yet supported, we'll probably
bring the support for userspace breakpoints by perf.

May be we should put a "ptrace" flag in struct hw_perf_event instead.

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