linux-kernel - Re: [PATCH v2 1/2] LoongArch: Add 128-bit atomic cmpxchg support

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Message-ID: <c775f4835b13ad2245e33afe740fb380a481ebd5.camel@xry111.site>
Date: Tue, 25 Nov 2025 16:01:02 +0800
From: Xi Ruoyao <xry111@...111.site>
To: mengqinggang <mengqinggang@...ngson.cn>, George Guo
 <dongtai.guo@...ux.dev>,  hev <r@....cc>
Cc: Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui <kernel@...0n.name>, 
	loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org, George Guo
	 <guodongtai@...inos.cn>
Subject: Re: [PATCH v2 1/2] LoongArch: Add 128-bit atomic cmpxchg support

On Tue, 2025-11-25 at 15:34 +0800, mengqinggang wrote:
> > I clearly remember when Jiajie submitted the sc.q support to GAS
> > Qinggang was really insistent on supporting the additional ",0" here. 
> > But I don't really understand why we must support it...

> Because gcc output sc.q $r,$r,$r,0. 

At that time GCC had not started to use sc.q yet.  Some unfortunate
communication error, I guess.


-- 
Xi Ruoyao <xry111@...111.site>