linux-kernel - Re: [PATCH 1/2] selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));"

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Message-ID: <20250721115149.42755-1-lianux.mm@gmail.com>
Date: Mon, 21 Jul 2025 19:51:49 +0800
From: wang lian <lianux.mm@...il.com>
To: richard.weiyang@...il.com
Cc: Liam.Howlett@...cle.com,
	akpm@...ux-foundation.org,
	brauner@...nel.org,
	broonie@...nel.org,
	david@...hat.com,
	gkwang@...x-info.com,
	jannh@...gle.com,
	lianux.mm@...il.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	lorenzo.stoakes@...cle.com,
	ludovico.zy.wu@...il.com,
	p1ucky0923@...il.com,
	ryncsn@...il.com,
	shuah@...nel.org,
	sj@...nel.org,
	vbabka@...e.cz,
	zijing.zhang@...ton.me,
	ziy@...dia.com
Subject: Re: [PATCH 1/2] selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));"

> On Thu, Jul 17, 2025 at 09:18:56PM +0800, wang lian wrote:
> >Several mm selftests use the `asm volatile("" : "+r" (variable));`
> >construct to force a read of a variable, preventing the compiler from
> >optimizing away the memory access. This idiom is cryptic and duplicated
> >across multiple test files.
> >
> >Following a suggestion from David[1], this patch refactors this
> >common pattern into a FORCE_READ() macro
> >
> >[1] https://lore.kernel.org/lkml/4a3e0759-caa1-4cfa-bc3f-402593f1eee3@redhat.com/
> >
> >Signed-off-by: wang lian <lianux.mm@...il.com>
> >Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>

> Reviewed-by: Wei Yang <richard.weiyang@...il.com>

Thanks!

> -- 
> Wei Yang
> Help you, Help me


Best regards,
Wang Lian