linux-kernel - Re: [RFC PATCH] x86/hweight: Get rid of the special calling convention

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Date:	Thu, 5 May 2016 16:04:46 +0200
From:	Borislav Petkov <bp@...e.de>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Brian Gerst <brgerst@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Andi Kleen <andi@...stfloor.org>, zengzhaoxiu@....com,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [RFC PATCH] x86/hweight: Get rid of the special calling
 convention

On Thu, May 05, 2016 at 03:02:37PM +0200, Denys Vlasenko wrote:
> You are looking at the version of a wrong program.
> gcc doesn't process assembly, it generates it.
> as is part of binutils, not gcc. "as --version".

I know. It doesn't matter a whole lot in this case if there's a subset
of gas versions which simply don't know about POPCNT and we do use
those in the kernel build.

Pending a better solution, I'll simply revert to the old, spelled POPCNT
bytes and don't bother with versions. Especially if someone tries to
build the kernel with some other compiler...

-- 
Regards/Gruss,
    Boris.

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