linux-kernel - Re: [tip:x86/urgent] x86/cpu: Use indirect call to measure performance in init_amd

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Message-ID: <20170712134844.GA20580@nazgul.tnic>
Date:   Wed, 12 Jul 2017 15:48:44 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     linux-tip-commits@...r.kernel.org, brgerst@...il.com,
        dvlasenk@...hat.com, peterz@...radead.org, mpatocka@...hat.com,
        hpa@...or.com, tglx@...utronix.de, linux-kernel@...r.kernel.org,
        luto@...nel.org, jpoimboe@...hat.com,
        torvalds@...ux-foundation.org, mingo@...nel.org
Subject: Re: [tip:x86/urgent] x86/cpu: Use indirect call to measure
 performance in init_amd_k6()

On Wed, Jul 12, 2017 at 06:09:57AM -0700, tip-bot for Mikulas Patocka wrote:
> Commit-ID:  429ed86b5c99b388543f6f7f6983b1230326f2bb
> Gitweb:     http://git.kernel.org/tip/429ed86b5c99b388543f6f7f6983b1230326f2bb
> Author:     Mikulas Patocka <mpatocka@...hat.com>
> AuthorDate: Tue, 11 Jul 2017 07:44:05 -0400
> Committer:  Ingo Molnar <mingo@...nel.org>
> CommitDate: Wed, 12 Jul 2017 10:42:32 +0200
> 
> x86/cpu: Use indirect call to measure performance in init_amd_k6()
> 
> This old piece of code is supposed to measure the performance of indirect
> calls to determine if the processor is buggy or not, however the compiler
> optimizer turns it into a direct call.

Are you booting on a real K6 or qemu?

-- 
Regards/Gruss,
    Boris.

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