linux-kernel - Re: [PATCH 1/3] perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN

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Message-ID: <20130427151434.GA25746@redhat.com>
Date:	Sat, 27 Apr 2013 17:14:34 +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,
	Will Deacon <will.deacon@....com>
Subject: Re: [PATCH 1/3] perf/x86/amd: AMD support for bp_len >
	HW_BREAKPOINT_LEN_8

On 04/27, Oleg Nesterov wrote:
>
> Suppose that the kernel was compiled without CONFIG_CPU_SUP_AMD.
> Then perf_event_open(attr => { .bp_len == 16 }) will succeed,
                                                  ^^^^^^^^^^^^
sorry, I meant "can succeed" if CPU has X86_FEATURE_BPEXT.

Oleg.

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