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 49D5A4B04B1; Mon, 7 Sep 2026 15:22:38 +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=1788794559; cv=none; b=YbZT/Zc2ZRlxEX+q9Ak6G90vmRbuqt0a80yogx0bN1qfHNobD5df34bAv9FQE0VAblrTTEp+T34JuNJvTHZ1LSULU9ExEla30xdOgg29a8yUfSnKkVcT0nxFneDwrzKL2WdbFRrymM3gcrGMwLamnaN0ASfXT+pcZMoWjzXqhHU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788794559; c=relaxed/simple; bh=/zl2YhCLLLy2wvwRTZfecyIW1kR5dLGkCPYLV+rUE4M=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=UQ61uMQRi60ksnJ+WP2e9n5SFnmzMUp+yau6/egI5weJJcjHfwgtQZR4OVIM28MQGaJaDKU4H6SEmJlGSZtIWxI4v5SrqH1P2+5YlTuoC3bwO+6ktOG5ING031KYAI0GzAm0YcW5pwlK/rZGz7u9KAOX+SVHw9pHWTGo8EjkMJM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KNF6zczO; 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="KNF6zczO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 486461F00A3A; Mon, 7 Sep 2026 15:22:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788794557; bh=2iV4wmxbLboD5m61BUcdgszYN9JR7rqtg6uMfGNK+Pw=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=KNF6zczOnUC280nScMOfHKGnsEhksMAL+0VbRvZvnl4CSfyvRBZbv2thM+uYmElMw 6DuJILmh6kZ9mgi6RDXXkSy9Q4WY/oeLwkQyCHgkxziG2LrqrmgxJ9fijG3M+wFwt7 Ao+SfjuFlLDZ0v0q7wt7jwoLje4eyliSQI4M2b8Yj0u5MLpzWywWt43ICRi0wfHGHZ aE+nmclaBKRvpV1ZduOdoBjPHJqU3xePzHjV5pWdXZ1qzVjYh5rptcD/EDOuVu1ya8 CjTE1/jpB71QuGqq9f9mkKTkpPxAVDGuu78RBjrCNGSExCcA+6N6tvD+Ndn7fDl0T5 WNI4EWfCcaAKA== Message-ID: <9a21fc3c-1ca9-42a3-a044-6421f20341f6@kernel.org> Date: Mon, 7 Sep 2026 17:22:32 +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 , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: 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> 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 9/7/26 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". 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? -- Cheers, David