linux-kernel - Re: [PATCH 07/15] x86: add xadd helper macro

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Message-ID: <4E53D694.3060802@goop.org>
Date:	Tue, 23 Aug 2011 09:34:28 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 07/15] x86: add xadd helper macro

On 08/23/2011 03:59 AM, Peter Zijlstra wrote:
>
> What you could do is something like:
>
> #define CASE_B	case 1
> #define CASE_W	case 2
> #define CASE_L	case 4
> #ifdef CONFIG_64BIT
> # define CASE_Q	case 8
> #else
> # define CASE_Q case -1 /* sizeof() won't ever return this */
> #endif

Yeah, that's OK, though I'll just make it the constants so there's still
a case keyword in the switch.

    J

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