From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x2267ZCBZQIXJaApxUM7wy1S2ggzjWp/QpEKEbhAw8Ber5lWYwuQ4PKamSDFTeZwn+l7FGv8d ARC-Seal: i=1; a=rsa-sha256; t=1519271240; cv=none; d=google.com; s=arc-20160816; b=VSh9Of07rjvpAzqGKq0hC3YiBBrZidpBfLeMXjsisdwVvfjdrjr/psOmIoxnKd1kwN 4HgDZLwayLTdnS0Po3JLcjGTlnQIlDUlPYLHXRIFUPrPxKRUG+/hb/301GinNwoiHDn6 RKLcDZ4ST1rJOl7gUgNdqkSQV3qBcJgfIJ30KqFIaybv7ag3n/dSVuexAT6yUBmA/mNe KpDuc0R6YdX7HwVY7SqGRMtb2qZSW6QCk7AMRKNjsLCWxKPH84CQDb/RjZ1bqyF1jiuj +lHD2H9Fo1LUiu2b85C3vlluqlZNsHdMnHKM2yhpdEVnHf0cph+RjrpaaYnvVRyFpXt1 YFpA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:content-transfer-encoding:content-language:in-reply-to :mime-version:user-agent:date:from:references:cc:to:subject :arc-authentication-results; bh=cwa8zzkms05CHJQPMErAGhKL70jGiAOcRJjMFNyudn8=; b=uxo6rqUEovzwG5MTmTmoHA64BNG6n2VZTD4xckvy/eCbb7ZLZnITKlFjTAB59s1pPd qGY4ep6wyDY/Nr196UrpEN/0LA0pZZHh2auC9eC0/vSxwzgtZu58z497iTLPwC6FNlcK uhUJp20yFY6IlzJusf4VzzeQM8P6sJoEGuDXFxInnO4WLMXyB3qd+o5wd3wel0402+/q iTvkhbEbiwnyuyanP4vwUIvFn1MZ5KGfAROPNtumb3ySiv5veiJivwp0jmbg8ndkTHp4 1TI+Z31aL65GrqhU/3Z61odkvqlkLj3l+dGykNwCZF8RyXogS1SgKw7kZZc5B47SWABG Pgnw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of andrew.donnellan@au1.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=andrew.donnellan@au1.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of andrew.donnellan@au1.ibm.com designates 148.163.158.5 as permitted sender) smtp.mailfrom=andrew.donnellan@au1.ibm.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=ibm.com Subject: Re: [PATCH] ocxl: Add get_metadata IOCTL to share OCXL information to userspace To: Balbir Singh , "Alastair D'Silva" Cc: linuxppc-dev , "linux-kernel@vger.kernel.org" , Arnd Bergmann , frederic.barrat@fr.ibm.com, Greg KH References: <20180221045736.7614-1-alastair@au1.ibm.com> <1519255934.2867.3.camel@au1.ibm.com> From: Andrew Donnellan Date: Thu, 22 Feb 2018 14:47:11 +1100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-AU Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 18022203-0016-0000-0000-00000528506D X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18022203-0017-0000-0000-000028646733 Message-Id: <76092e30-6959-942c-3600-95fb933eada8@au1.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2018-02-22_01:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1802220048 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1592985250939595866?= X-GMAIL-MSGID: =?utf-8?q?1593071360484087360?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 22/02/18 14:41, Balbir Singh wrote: >> Setting it to 0 is for the reader, not the compiler. I'm not clear on >> the benefit of starting the version at 1, could you clarify? > > How do I distinguish between version number never set and 0? The ioctl won't exist without a version number set. -- Andrew Donnellan OzLabs, ADL Canberra andrew.donnellan@au1.ibm.com IBM Australia Limited