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

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Message-ID: <f3405f2e-437c-a077-3a1c-90ff31e74787@zytor.com>
Date:	Wed, 4 May 2016 12:49:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	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>,
	Denys Vlasenko <dvlasenk@...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 05/04/2016 12:41 PM, Borislav Petkov wrote:
> On Wed, May 04, 2016 at 12:33:24PM -0700, H. Peter Anvin wrote:
>> Most likely not.  It would be nice to have some more uniform solution to
>> that.  I'm wondering if we could use the -Wa option to load some kind of
>> macro package.
> 
> Lemme try out some old compilers first, I'm guessing 3.2 won't know
> about popcnt...
> 

Sigh.  Doesn't look like -Wa is going to help due to the lack of the
equivalent of an -include option in gas.

	-hpa