linux-kernel - Re: [RFC Patch 2/4] Allow breakpoints to be enabled/disabled without yielding the breakpoint request through new APIs

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Date:	Wed, 28 Oct 2009 16:31:49 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC Patch 2/4] Allow breakpoints to be enabled/disabled
 without yielding the breakpoint request through new APIs -
 <enable><disable>_hw_breakpoint()

On Tue, 2009-10-27 at 02:49 +0530, K.Prasad wrote:

> Index: linux-2.6-tip.perf_hbkpt/include/asm-generic/hw_breakpoint.h
> ===================================================================
> --- linux-2.6-tip.perf_hbkpt.orig/include/asm-generic/hw_breakpoint.h
> +++ linux-2.6-tip.perf_hbkpt/include/asm-generic/hw_breakpoint.h
> @@ -102,11 +102,22 @@
>   * ----------------------------------------------------------------------
>   */
>  struct hw_breakpoint {
> +	/*
> +	 * Denotes if a breakpoint is currently enabled in physical debug
> +	 * registers. Not to be set directly by the end-user. Must be
> +	 * operated through <enable><disable>_hw_breakpoint() APIs only.
> +	 */
> +	atomic_t enabled;

Just a nit, but by looking at this structure as a whole, it's not easy
to see that the above comment is talking just about the "enabled" part
of the structure or the entire structure itself.

Probably want to add ...

	/*
	 * The enabled item denotes if ...


-- Steve

>  	void (*triggered)(struct hw_breakpoint *, struct pt_regs *);
>  	const cpumask_t *cpumask;
>  	struct arch_hw_breakpoint info;
>  };
>  
> +enum bp_status {
> +	BP_DISABLED	= 0,
> +	BP_ENABLED	= 1
> +};
> +

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