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Mon, 30 Mar 2026 00:23:12 -0700 (PDT) Received: from redhat.com ([209.132.188.88]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82ca85d3a71sm7217393b3a.30.2026.03.30.00.23.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2026 00:23:11 -0700 (PDT) Date: Mon, 30 Mar 2026 15:23:08 +0800 From: Li Wang To: "David Hildenbrand (Arm)" Cc: akpm@linux-foundation.org, rppt@kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org, aubaker@redhat.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v3] selftests/mm: skip hugetlb_dio tests when DIO alignment is incompatible Message-ID: References: <20260330053915.75442-1-liwang@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Mar 30, 2026 at 08:02:01AM +0200, David Hildenbrand (Arm) wrote: > > /* Open the file to DIO */ > > This comment is misleading as we are not opening "the" file, but we create a new one. > See below, maybe we should clean that up. +1 > > int main(void) > > { > > - size_t pagesize = 0; > > - int fd; > > + size_t pagesize = psize(); > > + unsigned int dio_align = get_dio_alignment(); > > Both could be const. +1 > Why can't we simply open the file once and pass the fd to run_dio_using_hugetlb()? > > fd = open("/tmp", O_TMPFILE | O_RDWR | O_DIRECT, 0664); > if (fd < 0) > ksft_exit_skip("Unable to allocate file: %s\n", strerror(errno)); > dio_align = get_dio_alignment(fd); > if (dio_align <= 0) > ksft_exit_skip("Unable to obtain DIO alignment: %s\n", strerror(errno)); Yes, apparently this is a good suggestion. Thanks! -- Regards, Li Wang