From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 9E3AF387352 for ; Mon, 30 Mar 2026 07:23:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774855397; cv=none; b=s5uJnODrYS1Hk82qQw65jkVbD0TWFytj1Mve2zWmFxBPaZZPfmCkBg3ql6vAneeQcJZKFZBDjRN+JishhMFgvEj7vh1Se6qMBa48TacJrX9ujJ0EZdWuUBKCG+SOXD+gk/Uq7/IRF+bPA5AEBZ6UQelrWAb/9HZBZ7cF8ugotxs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774855397; c=relaxed/simple; bh=BdSusAkF/oQFRNlMBbzmWyLxgLq1gUDuAB+K4Y2gWQU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=mtD/Kpxk1CaScvw0j7R+z+NxyadvvIG3GqXXx8xpv1uVrur604mCMlykRkD/E43dcLPlrcOrBNZelwb9Crl0GKEhKlV8cfmkriGbClqeUmaQee/DiRumXYjuh9PwKd6cC+Zq7kadqoHikPLGfSohLM8IpHlPs+wRAFpvpipCE+s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=SoRw3OdR; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=o/t8v9A8; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SoRw3OdR"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="o/t8v9A8" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774855395; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=NZ0LQnOR95aHR/QhroiVMVa82mQ7m1GAsbziC8rzFfs=; b=SoRw3OdRKd4H+luoKMfHN3lW90JeoBPlfMgJHUh9TNft2YX+bccmRHA+Bl8lJOgzIeZxUf +ac7roifXB2K0QlM8YMdi3Zes8wBwoKHmLkoNzNdwHc4JwlWUEGexFnzRUisYEgXX9ryyl C/qVVS3ejFADlS5a5A89tfDWWaxyXDs= Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-498-1ZKKwLNzN-yp4soB0umNQA-1; Mon, 30 Mar 2026 03:23:13 -0400 X-MC-Unique: 1ZKKwLNzN-yp4soB0umNQA-1 X-Mimecast-MFC-AGG-ID: 1ZKKwLNzN-yp4soB0umNQA_1774855393 Received: by mail-pf1-f198.google.com with SMTP id d2e1a72fcca58-82c38b85c25so7870196b3a.3 for ; Mon, 30 Mar 2026 00:23:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1774855392; x=1775460192; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=NZ0LQnOR95aHR/QhroiVMVa82mQ7m1GAsbziC8rzFfs=; b=o/t8v9A8KR68HcG5x2EwxpvqoBw6yf9EgNBwUNc531APA9cqkRPhD3bRfTPQvLPbS9 PMAdlZyy1zBQZmIkX5Q9vHpykExjqy4uOd/coc2xESyFP46Wde91mzIx3mFi2+S+aGSq 65PGdIcvmIkQeEhjdXfiZs9SCLls2lRt6IQAIbKF2900mo7Flbvw8XowAFfSfNWuMr7X eJo927pNbKcvT/mWjgMdb6nWff5Qjda3vWadtud82EQH4pu+Mg/gOtoiPWPj6V6xiGhf KU+HAzLP7tV4TL5OSh4RtdjDlu8An1DpFSS6YvQSIVe5tDO977l7ZelJObX41GASGmj3 J7EQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774855392; x=1775460192; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=NZ0LQnOR95aHR/QhroiVMVa82mQ7m1GAsbziC8rzFfs=; b=m4Vfqb0+KvXX3yolxNGCpdbY2nVAHu1Iph8Cj+EKJG/ulZHKFh6FDDQTsqlBWnPLBe nU1pFU42XJ6N0vkkjrbI0IfF8h0wnXxzCJXOBXjY3PT6vINO+dwvaKIhy+2xu1En/Emi MBYvq5JF/wwGrP7xG8VHPSWZTLnUFCKomqChEumkycf8T8z+X05zvjhJzLFZrSKTU/G+ vJq7gyrVr5DmwYazI9CS0r6G5nYTvCZn2sB4gz55gyQVuTptLPUjR+OBFtTfjsvpR2U+ 2XNr6SKK83Vu/LqxXfIfC13M9S/8epLVc1cSHqmLsWilQbRZLsvIUh4J18D7mMFCW/0C cklw== X-Forwarded-Encrypted: i=1; AJvYcCXMD4eLQaYqLrneJnKncKAze8itkN2sl7IlIwW3xlroGM6XguJhXvB5hUSOSuOwp9jjSCbxYitPcCD5cKrWuPM=@vger.kernel.org X-Gm-Message-State: AOJu0Ywrn/F6XtLFiqa01fHJ330Ra13thmFiSTTMVPXdKZyQcYpx7wK4 Jjtyww9K0vrROwJGprrkXgjYL+ZgFfsDZeNIdNhnTBKDoSFDE+00fZmTCyq1r66qhg4gjuC60tS 5OrmjUY05eYe7S4VESKJpnqF4TiRJICxDxAHlEW46fyDyMyn7r3EF31Xt+/w0rR/sjXtFSw== X-Gm-Gg: ATEYQzyU34+fBW+20+6k27w/mZJxo9hX+kxeQXSUbFdwMVksqGJfdttX8/HZdOsYlLg SnULIztigYJQFJbQjoNUFja7ukNUXJ5UiYJw0i2107pZ0vmB0OeOR9qLNvnjzBZ0gXodIpiYrN7 Zvg5JRod5TLbi9EwXoOh4oxIvTwsYkoe4c08uoHNKen9+DZ/By7E8RCFoK3bWZzjL1JSnBsth0+ V94MnecEyQkXddJ56n7kFeMTT1o6dDj/LdFqGW1EO2xAt2EwuS4TlN34V+DFPJqGY0ChiDTG0A6 ScTDB0UlD1is6N+6Oi4l7m/VQNx3/yTGQKP7nnLP+hLtv+irXzwBhO3wPQuwcNE/+ladataxXsb uQ8nUN8serGKP7sgkiw== X-Received: by 2002:a05:6a00:2d01:b0:82a:79b8:2049 with SMTP id d2e1a72fcca58-82c95c21e4fmr10957435b3a.25.1774855392509; Mon, 30 Mar 2026 00:23:12 -0700 (PDT) X-Received: by 2002:a05:6a00:2d01:b0:82a:79b8:2049 with SMTP id d2e1a72fcca58-82c95c21e4fmr10957402b3a.25.1774855392034; 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-kselftest@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