From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 1911BA0487 for ; Mon, 1 Jul 2019 17:30:09 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 2ED751B9D7; Mon, 1 Jul 2019 17:30:08 +0200 (CEST) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id 1462B1B9C5 for ; Mon, 1 Jul 2019 17:30:06 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 Jul 2019 08:30:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,439,1557212400"; d="scan'208";a="361870141" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.30]) ([10.237.221.30]) by fmsmga005.fm.intel.com with ESMTP; 01 Jul 2019 08:30:04 -0700 To: David Marchand , Bruce Richardson Cc: Thomas Monjalon , dev , Neil Horman , Adrien Mazarguil , Stephen Hemminger , Harry Van Haaren References: <1561635235-22238-1-git-send-email-david.marchand@redhat.com> <1561809533-6545-1-git-send-email-david.marchand@redhat.com> <2123522.W70hLPZofc@xps> <47b0afe9-96ba-eafd-cf37-08c69742b15e@intel.com> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v2 00/10] experimental tags fixes X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 7/1/2019 3:36 PM, David Marchand wrote: > > > On Mon, Jul 1, 2019 at 4:15 PM Ferruh Yigit > wrote: > > On 6/29/2019 6:06 PM, Thomas Monjalon wrote: > > 29/06/2019 13:58, David Marchand: > >> Following the build error reported by Aaron [1], I noticed that some > >> experimental functions could go unnoticed because of a gcc peculiarity. > >> > >> To catch those, I went and added a new check on the object files to > >> ensure that any experimental api flagged in the map files is really > >> exported as such. > >> > >> Then went with my previous idea of only adding the tags on the functions > >> prototypes and enforcing it (a new check in checkpatches.sh). > >> And finally enforcing that the __rte_experimental tag is always the first > >> part of a function prototype which seems to work with both gcc and clang. > > > > Applied, thanks > > > > > Getting an odd build error with "i686-native-linuxapp-icc" [1]. > Beware of the "." at the end: "rte_flow_conv." > > Objdump shows two symbols with one "." at the end and one without it [2]. > > And this seems not the problem of only experimental APIs [3]. But this is only > happening with "i686-native-linuxapp-icc". > > Do you have any idea what is going on here? > > > Looked at rte_flow_conv, and I can not see anything special about it. > > There might be a subtility in the way symbol names are chosen by ICC. > Can ICC guys look at this and give us some enlightment? This is the sample disassembler of one of the "." functions [1], it looks like this notation is used by compiler to prepend some code at the very begging of the function, Harry (cc'ed) let me know this is may be security feature, not a defect of compiler :) So briefly, it looks like compiler can add this "." version of the symbols to the ".text.experimental" section, I believe the solution is detect this notation and handle it. What do you think? [1] 00002070 : 2070: 0f b7 44 24 04 movzwl 0x4(%esp),%eax 00002075 : 2075: 56 push %esi 2076: 57 push %edi 2077: 83 ec 14 sub $0x14,%esp 207a: 0f b7 c0 movzwl %ax,%eax 207d: 83 f8 20 cmp $0x20,%eax 2080: 7d 14 jge 2096 2082: 8b f0 mov %eax,%esi 2084: 8b f8 mov %eax,%edi 2086: c1 e6 06 shl $0x6,%esi 2089: c1 e7 0d shl $0xd,%edi 208c: 83 bc 3e 28 20 00 00 cmpl $0x0,0x2028(%esi,%edi,1) 2093: 00 2094: 75 1c jne 20b2 2096: 50 push %eax 2097: 68 00 00 00 00 push $0x0 209c: ff 35 00 00 00 00 pushl 0x0 20a2: 6a 04 push $0x4 20a4: e8 fc ff ff ff call 20a5 20a9: 83 c4 10 add $0x10,%esp ....