From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9E0BE33B96B; Mon, 19 Jan 2026 10:50:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768819820; cv=none; b=j+/GumuVs5Qc41hpku6JSDGCubP1wwUAhaEHGJ3kF8+rHrIvY9dHaVlZAPrBKyzFeG8ioYQFEeb6wMOSbFnlweb2T5OB7qNJPQHGJjkgUY7/FwQP/WeHhUMD2rY+W5m6FNIbIXS4UqXC3fdfAtwKG3XnUZfQSFpPCp3C4oq/L9Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768819820; c=relaxed/simple; bh=ZxzOJ4oQEra0siX2nuGmp1Odh2MhJ5xZ8jMUn/Ah4gk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=nGS9hTQcGKoNnTtw89T6FPjzw3w9NX4Pe9t1YMM7wvr/nieqVB+NMGRvz1gy4DQkz5sCwgCtQpbmGqMX5QVC8RKaDujNIwLoRAQI98Vjq3kCXkrBH6dx7KYT8xjayYski+QQFYx+YH/qvszNYNIGu6XjzbXI+PIQS3lOldZxVfY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Mb3l4B93; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Mb3l4B93" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EFE8BC116C6; Mon, 19 Jan 2026 10:50:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768819820; bh=ZxzOJ4oQEra0siX2nuGmp1Odh2MhJ5xZ8jMUn/Ah4gk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Mb3l4B93W7KHvJqwCHsHAebr5jOOyiZlGqBl9zbbC4g/ii3pn0ZDDm7Ohwcy8iKkR gTGS3vWHE2icNR7vhXXMBH55mWFZVY2oYmaHSuBpUMugiX3mSQSOYZ3UDMyUfhDXi2 SFAbC6/OrsSAglWp32PITL/43LEBiO/H+MFhd2je0bCAYTtb9J3mCcHsaCFFp+bWH1 0KTTuF873zuO5A/mK7hDCJz5KtfnB5x9JPeePjkce7Yi8WkMCJx3vea8n9udJ4+3V1 SpsMmoCCpJmsyYXoy0+F4Mnjj2vXMgbo6rSvG1RVCt3cHsMsPUi48hhxYMlqX0Sps/ dywkRtRlSS3Bg== Message-ID: Date: Mon, 19 Jan 2026 11:50:15 +0100 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/8] selftests/mm: fix usage of FORCE_READ() in cow tests To: Kevin Brodsky , linux-mm@kvack.org, linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Andrew Morton , Lorenzo Stoakes , Mark Brown , Ryan Roberts , Shuah Khan References: <20260107164842.3289559-1-kevin.brodsky@arm.com> <20260107164842.3289559-5-kevin.brodsky@arm.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/7/26 17:48, Kevin Brodsky 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. Right, that's nasty! Thanks! For all cases, we could probably just fail if the memory is not populated after FORCE_READ(). Would you have time to prepare a patch for that? Acked-by: David Hildenbrand (Red Hat) -- Cheers David