linux-kernel - Re: Kernel broken on processors without performance counters

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Message-ID: <20150723175436.GA12218@nazgul.tnic>
Date:	Thu, 23 Jul 2015 19:54:36 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jasonbaron0@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Vince Weaver <vince@...ter.net>,
	"hillf.zj" <hillf.zj@...baba-inc.com>,
	Valdis Kletnieks <Valdis.Kletnieks@...edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Kernel broken on processors without performance counters

On Thu, Jul 23, 2015 at 07:08:11PM +0200, Peter Zijlstra wrote:
> That would be bad, how can we force it to emit 5 bytes?

.byte 0xe9 like we used to do in static_cpu_has_safe().

Or you can copy the insn sizing from the alternatives macros which I
added recently.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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