linux-kernel - Re: [PATCH v2 4/8] selftests/mm: fix usage of FORCE

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Message-ID: <20260108005700.79922-1-sj@kernel.org>
Date: Wed,  7 Jan 2026 16:56:59 -0800
From: SeongJae Park <sj@...nel.org>
To: Kevin Brodsky <kevin.brodsky@....com>
Cc: SeongJae Park <sj@...nel.org>,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Mark Brown <broonie@...nel.org>,
	Ryan Roberts <ryan.roberts@....com>,
	Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH v2 4/8] selftests/mm: fix usage of FORCE_READ() in cow tests

On Wed,  7 Jan 2026 16:48:38 +0000 Kevin Brodsky <kevin.brodsky@....com> wrote:

> Commit 5bbc2b785e63 ("selftests/mm: fix FORCE_READ to read input
> value correctly") modified FORCE_READ() to take a value instead of a
> pointer. It also changed most of the call sites accordingly, but
> missed many of them in cow.c. In those cases, we ended up with the
> pointer itself being read, not the memory it points to.
> 
> No failure occurred as a result, so it looks like the tests work
> just fine without faulting in. However, the huge_zeropage tests
> explicitly check that pages are populated, so those became skipped.
> 
> Convert all the remaining FORCE_READ() to fault in the mapped page,
> as was originally intended. This allows the huge_zeropage tests to
> run again (3 tests in total).
> 
> Fixes: 5bbc2b785e63 ("selftests/mm: fix FORCE_READ to read input value correctly")
> Signed-off-by: Kevin Brodsky <kevin.brodsky@....com>

Acked-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

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