From nobody Fri May 31 19:52:02 2024 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4VrYg55gr1z5LGdW; Fri, 31 May 2024 19:52:17 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4VrYg45QRMz4Pyf; Fri, 31 May 2024 19:52:16 +0000 (UTC) (envelope-from kostikbel@gmail.com) Authentication-Results: mx1.freebsd.org; dkim=none; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=gmail.com (policy=none); spf=softfail (mx1.freebsd.org: 2001:470:d5e7:1::1 is neither permitted nor denied by domain of kostikbel@gmail.com) smtp.mailfrom=kostikbel@gmail.com Received: from tom.home (kib@localhost [127.0.0.1] (may be forged)) by kib.kiev.ua (8.18.1/8.18.1) with ESMTP id 44VJq2Zk019896; Fri, 31 May 2024 22:52:05 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.10.3 kib.kiev.ua 44VJq2Zk019896 Received: (from kostik@localhost) by tom.home (8.18.1/8.18.1/Submit) id 44VJq2IA019895; Fri, 31 May 2024 22:52:02 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Fri, 31 May 2024 22:52:02 +0300 From: Konstantin Belousov To: Kyle Evans Cc: src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: 6e824f371301 - main - time: siginfo_recvd needs to be marked volatile Message-ID: References: <202405220537.44M5bugu007292@gitrepo.freebsd.org> List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-main@freebsd.org Sender: owner-dev-commits-src-main@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202405220537.44M5bugu007292@gitrepo.freebsd.org> X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FORGED_GMAIL_RCVD,FREEMAIL_FROM, NML_ADSP_CUSTOM_MED autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on tom.home X-Spamd-Bar: -- X-Spamd-Result: default: False [-2.98 / 15.00]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.98)[-0.979]; MIME_GOOD(-0.10)[text/plain]; DMARC_POLICY_SOFTFAIL(0.10)[gmail.com : No valid SPF, No valid DKIM,none]; ARC_NA(0.00)[]; ASN(0.00)[asn:6939, ipnet:2001:470::/32, country:US]; MIME_TRACE(0.00)[0:+]; MISSING_XM_UA(0.00)[]; FREEMAIL_FROM(0.00)[gmail.com]; TO_DN_SOME(0.00)[]; HAS_XAW(0.00)[]; R_DKIM_NA(0.00)[]; MLMMJ_DEST(0.00)[dev-commits-src-all@freebsd.org,dev-commits-src-main@freebsd.org]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; FREEMAIL_ENVFROM(0.00)[gmail.com]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all]; RCVD_TLS_LAST(0.00)[]; RCPT_COUNT_THREE(0.00)[4] X-Rspamd-Queue-Id: 4VrYg45QRMz4Pyf On Wed, May 22, 2024 at 05:37:56AM +0000, Kyle Evans wrote: > The branch main has been updated by kevans: > > URL: https://cgit.FreeBSD.org/src/commit/?id=6e824f3713011f7955a4f88fb16445e8e2cbe72c > > commit 6e824f3713011f7955a4f88fb16445e8e2cbe72c > Author: Kyle Evans > AuthorDate: 2024-05-22 05:36:29 +0000 > Commit: Kyle Evans > CommitDate: 2024-05-22 05:37:41 +0000 > > time: siginfo_recvd needs to be marked volatile I do not think so. It happens to work with the compilers we currently use. > > sig_atomic_t does not imply volatility, we must do it ourselves to avoid > caching of siginfo_recvd loads. For this purpose, standard provides atomic_signal_fence(). You would need to put it before read of siginfo_recvd (after wait4()), and after update of siginfo_recvd in the signal handler.