linux-kernel - Re: [PATCH V2 2/4] perf/x86/amd: AMD implementation for hardware breakpoint address mask

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Message-ID: <20130423132207.GB24467@redhat.com>
Date:	Tue, 23 Apr 2013 15:22:07 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Jacob Shin <jacob.shin@....com>
Cc:	Ingo Molnar <mingo@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/4] perf/x86/amd: AMD implementation for hardware
	breakpoint address mask

On 04/23, Jacob Shin wrote:
>
> +int arch_validate_hwbkpt_addr_mask(struct perf_event *bp)
> +{
> +	if (!cpu_has_bpext)
> +		return -EOPNOTSUPP;

I must have missed something...

But it shouldn't fail if bp_addr_mask == 0?

Oleg.

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