From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 9CC2953D0AE; Tue, 8 Sep 2026 12:38:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788871128; cv=none; b=qldK5tkAdig7pc0YLvDXyz0MQsn7yQHtFilYVDwYFs03cy4s59tXK6ZpttYjelpYxpz44vhC9eHj8d3UH6ntQKlV/LJEv9BM7I9SGE5wnzrsrJiuOlqPSad5RHtc6o5O6mZKnmiI76+uveqJqF2Bf1KuGC/VB1TqZzzqBXI0KdM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788871128; c=relaxed/simple; bh=LconcLIYxLMpRPe1qsgaSQNp6+UlnNRm53XEGj2Qv3M=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=CVPdO6m6pbmyPUCeqC1Wby042GHpa9sxXUjn2gyIWe0Vqw0WGwAQyC0Vrm/wVgPzz/5cNp31SF0wj9OPOfDEZV//19mClIrDUJ+6f2A/2UYOwOe6ZwCrO47jy8nporOrOZhdOdoht2mtESiwcGfQWzbz9cbb6iQRNa+boY69LWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RujEipcD; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RujEipcD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6C7F31F00A3A; Tue, 8 Sep 2026 12:38:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788871127; bh=fY14K9jk30Jrb6+u7e+f1I2SecfbVWLG2CSKPUhXInI=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=RujEipcDEg/FCA174vxG8rgLdPncusl4HTzzr2yjAaMI1b+cxe4wRSI/Sp1HbPwoB fY820jq4QhzoOte2FDnbWzxohbWTFoXYQuM/xd5YbqCBT0Swgxd2cNkbr/6ALrazCD +4CrNOV9nJe7vuy+DrwI3hjFp0CAT+oZplErdjVuHRpYeytfE0km+YNxw3KAAd2ifg 0k9JSsX+4sPrnWu95zYTI2TPZsW1jNxz890N2LJibA/gQU8sP6ahGX5n1YMpIFiVnF 6tO+7hjF8bL7K4jaT6iSbGSwhcllCVDF0T/1NFKDT/t27cwfPI++oFc3P7Cr+lZS58 Kn4Z7QfE8d/Nw== Message-ID: <0f15df3b-b4ac-41f5-9470-08bc69bbdebe@kernel.org> Date: Tue, 8 Sep 2026 14:38:40 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] selftests/mm: fix size truncation in pagemap_ioctl test To: Zenghui Yu Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org References: <20260907135613.68692-1-zenghui.yu@linux.dev> <9a21fc3c-1ca9-42a3-a044-6421f20341f6@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/8/26 13:22, Zenghui Yu wrote: > On 9/7/26 11:22 PM, David Hildenbrand (Arm) wrote: >> On 9/7/26 15:56, Zenghui Yu wrote: >>> From: "Zenghui Yu (Huawei)" >>> >>> On arm64 with 64K base pages, the huge page size is 512 MiB, and >>> hpage_unit_tests() builds a 5 GiB range (10 * 512 MiB) for its tests. This >>> exceeds the range of the int size parameters of gethugepage(), >>> wp_addr_range() and pagemap_ioctl(). The implicit truncation to 1 GiB >>> makes gethugepage() allocate a too small buffer, while the callers keep >>> operating on the original 5 GiB range, resulting in spurious failures or >>> SIGSEGV. >>> >>> Change those size parameters to size_t. >>> >>> Fixes: 46fd75d4a3c9 ("selftests: mm: add pagemap ioctl tests") >>> Assisted-by: GLM-5.3 OpenCode >>> Signed-off-by: Zenghui Yu (Huawei) >>> --- >> >> Looking at pagemap_ioctl.c ... I think most functions should actually be "static". > > Yup. > >> Using size_t is ok. But then we should also change "unsigned long long mem_size" >> to size_t, no? >> >> Also, in wp_free() we are suddenly using "long size". In pagemap_ioc() we're >> also still using "int len". >> >> Can we consistently use one type please? > > Yes we can. This patch adopts a minimal fix for this specific issue. Right, but for this selftest in particular we don't need a minimal fix. :) -- Cheers, David