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Thu, 31 Jul 2025 18:13:55 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id zoLMN2Oyi2hVQwAAD6G6ig (envelope-from ); Thu, 31 Jul 2025 18:13:55 +0000 Message-ID: Date: Thu, 31 Jul 2025 20:13:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] tools/testing/vma: Fix function parameter declarations for GCC 8.3 compatibility To: Lorenzo Stoakes , WangYuli Cc: akpm@linux-foundation.org, Liam.Howlett@oracle.com, jannh@google.com, pfalcato@suse.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, niecheng1@uniontech.com, guanwentao@uniontech.com, Jun Zhan , linux-kbuild@vger.kernel.org References: <37b606a7-17c6-4865-a78a-ddde1bc15649@lucifer.local> Content-Language: en-US From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <37b606a7-17c6-4865-a78a-ddde1bc15649@lucifer.local> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Stat-Signature: asib7j3br5xisp6489hnnufjhoehjz4k X-Rspamd-Queue-Id: 3242B180011 X-Rspamd-Server: rspam10 X-Rspam-User: X-HE-Tag: 1753985639-135143 X-HE-Meta: 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 pBd8XZYR QWcwJsn4j9/mvdNb+vZodaNUjyQNnOuiRJmNPlR6RRRaFNeogZacsil6mUXgNKQZU8wG7yWkm6iEV8AjSW+XPem+Ajyg9u7gKHsGSn/wFx1uuaDx/p+jK2ebYSFRoZXmo26eKVN+/xk/3qEqx2OyinAamz0OXcBqtR/zMKb+kUTi2wNZG2w/bMhYtsI7Dcwd9XGkyUZKeRRjqs5fjkRrjdJacs5ggh6dO3csNa2N/iaGo1ZQn8RW5/HPCJnOF9aRPG1BAw5CnZsxConZPlBF/RRlExLOuip8Now6H X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/31/25 12:24, Lorenzo Stoakes wrote: > On Thu, Jul 31, 2025 at 10:55:32AM +0800, WangYuli wrote: >> > >> Thanks for the heads-up! I noticed that coding style in the kernel code as >> well. >> >> However, GCC 8.3 (which does meet the kernel's compiler version >> requirements) can compile the kernel code normally, but it can't compile >> vma's test correctly. >> >> Could the issue be related to differences in compilation parameters? I'll >> need to spend some time looking into this more closely... > > OK thanks please do check, am happy to have a patch to add a flag if > appropriate! :) > >> >> By the way, this coding style has been a GNU C extension until the ISO C23 >> standard. So, until the kernel's C language standard is upgraded to C23 >> (which seems unlikely to happen anytime soon, perhaps years down the line), >> it actually makes sense to modify this style for a practical purpose... > > Kernel always uses the GNU C standard by convention, so we should be good, > but indeed I think this is the case! I think it's not "by convention" but quite explicitly by: Makefile:KBUILD_CFLAGS += -std=gnu11 I think this is not automatically used by tools/ build? If you git grep gnu11, you'll find various Makefile's under tools/ adding that to CFLAGS. Maybe we can simply do that also with tools/testing/shared/shared.mk that's included for the vma tests. I don't have this gcc version so can't try myself if it helps. > The irony here is that I actually intend to change stubs in this header to > remove parameter names (previously had review on this :). > >> >> [ Cc the kbuild list. ] > > Thanks > >> >> Thanks, >> >> -- >> WangYuli > > Cheers, Lorenzo