linux-kernel - Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after init

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Message-ID: <20160118232547.GK12651@pd.tnic>
Date:	Tue, 19 Jan 2016 00:25:47 +0100
From:	Borislav Petkov <bp@...e.de>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Brian Gerst <brgerst@...il.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86: static_cpu_has_safe: discard dynamic check after
 init

On Mon, Jan 18, 2016 at 03:13:00PM -0800, H. Peter Anvin wrote:
> The optimization has always been there, the question is how often it
> actually kicks in.

Luckily, I have this disassembler tool which dumps the alternatives
sections in a more readable format. I can dump all the static_cpu_has()
call sites tomorrow and we can see what gcc generates.

;-}

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--