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

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Date:	Mon, 22 Aug 2011 16:29:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.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 08/22/2011 04:15 PM, Jeremy Fitzhardinge wrote:
> From: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> 
> Add a common xadd implementation.
> 
> This has the side effect of generating a bad instruction if you try to
> use it on a 64-bit value on a 32-bit system - but don't do that.
> 

It would be better to barf at that point, so we get the error with a C
line... also, there needs to be a default clause with
__compiletime_error() in it.

There are a few additional xadd users which should be converted unless
I'm mistaken:

rwsem_atomic_update() in asm/rwsem.h.

atomic_add_return() in asm/atomic.h.

atomic64_add_return() in asm/atomic64_64.h.

atom_asr() in asm/uv/uv_bau.h (*VOMIT* - the UV people have created a
whole different type in private code...)

	-hpa
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