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 7BCFA3AEF5F; Thu, 19 Mar 2026 21:48:45 +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=1773956925; cv=none; b=RoHYib7ViJxnHzLnfxO0IMS2aN1scDDnPYfBkcgHUyevgfW58bIArBcFBaLa6p6Jxc1toAa+cZuF8qQYCWVJFZL0qBMdpRHJvODQv/f0dTLNOZCVD53OzAvx2jP7PeuBOYzWdsIdzzpLLQ7cGLsyHWlk1ptLmlF2yBm1CKihnSo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773956925; c=relaxed/simple; bh=XnzQTklrSR9ouPzmgc9VsJCQGhrX2SeFT7FyxZbT7WQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=IEQLoHAGlOKRtMk/WOprxfat1u7hinrReQsoQePPg4u7+5Wl7iZBH+mK2bR/lmWVzofIUkwMnZ77kcB/TNg+wk5uUBEm/px6rX472geZkEy15zChkloNW++Erk2Zl6UMhypGd339d1/V1lrW7UTRnrMyOuofNGDTMS5CCY7jsrk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=et1Zm07x; 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="et1Zm07x" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E56FC2BC9E; Thu, 19 Mar 2026 21:48:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773956924; bh=XnzQTklrSR9ouPzmgc9VsJCQGhrX2SeFT7FyxZbT7WQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=et1Zm07xdmkYSe+PmNq7hbjk919Aa4uCh0SamqVkV9EronDzdGfnmMzVdcxryKspq 7OsFTrapVR7Xzg0agRnyLzQpoGxGfspujLlZMTMduhJZl/rCo7YxpEFCyogBr4+UTD aYC0ERlA/0daio6rjolrBXhbO2IH9e8uxfYh2Nds3FYAjyXkA1HvCPcA5Wk0kfI5bL s68eqr0RIV/5SHyHiDacGW9A90wuItRLEWCT+D3TmmeLqLj7iF/cN+XoKf8bevYYIp G63lKPA0ZVCFs4ZyO47QmThbB8dOG64RmDsFDIqKzLgkYv7vj3Nm16hX5j5FT+EXCl D8BBgjcjzm+Cg== Message-ID: <78352e6f-fa40-41ee-b044-62f682f3ca43@kernel.org> Date: Thu, 19 Mar 2026 22:48:38 +0100 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 v4 3/5] selftests/mm: move write_file helper to vm_util To: Chunyu Hu , akpm@linux-foundation.org, shuah@kernel.org, linux-mm@kvack.org, ljs@kernel.org Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev References: <20260319160656.1480279-1-chuhu@redhat.com> <20260319160656.1480279-4-chuhu@redhat.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit > + > +void write_file(const char *path, const char *buf, size_t buflen) > +{ > + int fd; > + ssize_t numwritten; > + > + fd = open(path, O_WRONLY); > + if (fd == -1) > + ksft_exit_fail_msg("%s open failed: %s\n", path, strerror(errno)); > + > + numwritten = write(fd, buf, buflen - 1); > + close(fd); > + if (numwritten < 1) > + ksft_exit_fail_msg("Write failed\n"); I guess we could indeed test here easily for if (numwritten != buflen - 1) But then, we don't really expect only partial writes to succeed here. Acked-by: David Hildenbrand (Arm) -- Cheers, David