From: David Hildenbrand <david@redhat.com>
To: wang lian <lianux.mm@gmail.com>,
akpm@linux-foundation.org, broonie@kernel.org,
lorenzo.stoakes@oracle.com, sj@kernel.org, ziy@nvidia.com,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: brauner@kernel.org, jannh@google.com, Liam.Howlett@oracle.com,
shuah@kernel.org, vbabka@suse.cz, ludovico.zy.wu@gmail.com,
gkwang@linx-info.com, p1ucky0923@gmail.com, ryncsn@gmail.com,
zijing.zhang@proton.me
Subject: Re: [PATCH] selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));"
Date: Wed, 16 Jul 2025 15:16:49 +0200 [thread overview]
Message-ID: <914ce985-f642-473e-a312-0a390ab5e78b@redhat.com> (raw)
In-Reply-To: <20250716123126.3851-1-lianux.mm@gmail.com>
On 16.07.25 14:31, 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@gmail.com>
> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-07-16 13:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-16 12:31 [PATCH] selftests/mm: reuse FORCE_READ to replace "asm volatile("" : "+r" (XXX));" wang lian
2025-07-16 13:16 ` David Hildenbrand [this message]
2025-07-16 22:15 ` Andrew Morton
2025-07-17 6:58 ` Wei Yang
2025-07-17 10:48 ` wang lian
2025-07-17 11:43 ` David Hildenbrand
2025-07-19 9:27 ` David Laight
2025-07-20 9:23 ` Lorenzo Stoakes
2025-07-20 11:03 ` wang lian
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