From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-2529736-1521058141-2-18017120334927432511 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.25, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='198.145.29.99', Host='mail.kernel.org', Country='US', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='us-ascii' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: SRS0=qElZ=GE=infradead.org=peterz@kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1521058141; b=SXn2a18UzyOwL7hD6tVHcgTJDWisrEk5TPo1w06xGagT8JW LBpmamB0lqrkDueIcUYuur0QasUOnbNNGXbMoTBpSSDheCIVN2KWAqxfs1OEhkKh DaWb4ZX/2iwHY9JDMNWatvffGlHsXlVKQCdyxYFEIxYH3GW/WgIhArEs6ltz/G1W qtizRe0+ngUO/Jm22TGtRbFX1SeRj5L4Ri0gsS1dvT4OeGzZFTPw3+LnAgY7hlQa 96pvRr5p6Nr1rgvGDjJHZNn6dFh68SuXNi+ZPEXT1avlgFyTwssCMjJ44aI+PQep hU0j0vvKqrQU/jLL8tVOEl4Lq1me4JDYylkBXXg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=date:from:to:cc:subject:message-id :references:mime-version:content-type:in-reply-to; s=arctest; t= 1521058141; bh=nvhbGiuX2ovYkaRNin8J3IQ9l7y5xi0vm92oAL9N2ao=; b=C h8Zxub2mVZ6S4qsdWB9kalyvEr2mwV6zmoD9sX0jsxglANQL9KI0ScNAIM7NF6Zc vMoUAfqmPq17qnbbPj4sW5kd2q/5IGf61EhULQv31OTxAGhO4mmKGcwp6hyyeldD cJRW3dzb7Nkeg1dfI4VvwVLBw8P0/Jcj5wjO6KEbAt6TMuOWaRn+0Ub/8ifyjQyb lPG1IOpXyTpavAytei8VO3Mu+c6UANHffGm0/ZpcSxomaqIU+smFBt2uwH49iaKH ISN67oHJNL4oqcWu8o0rl1TsYpNeOzwlePZNaHqRD1YYF0SH9N/9P0C50g9A0612 k9En4ZszijumEyORtVjag== ARC-Authentication-Results: i=1; mx5.messagingengine.com; arc=none (no signatures found); dkim=pass (2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=Rsu/JnNA x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=merlin.20170209; dmarc=none (p=none,d=none) header.from=infradead.org; iprev=pass policy.iprev=198.145.29.99 (mail.kernel.org); spf=none smtp.mailfrom=SRS0=qElZ=GE=infradead.org=peterz@kernel.org smtp.helo=mail.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0; x-ptr=pass x-ptr-helo=mail.kernel.org x-ptr-lookup=mail.kernel.org; x-return-mx=pass smtp.domain=kernel.org smtp.result=pass smtp_is_org_domain=yes header.domain=infradead.org header.result=pass header_is_org_domain=yes; x-tls=pass version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128 Authentication-Results: mx5.messagingengine.com; arc=none (no signatures found); dkim=pass (2048-bit rsa key sha256) header.d=infradead.org header.i=@infradead.org header.b=Rsu/JnNA x-bits=2048 x-keytype=rsa x-algorithm=sha256 x-selector=merlin.20170209; dmarc=none (p=none,d=none) header.from=infradead.org; iprev=pass policy.iprev=198.145.29.99 (mail.kernel.org); spf=none smtp.mailfrom=SRS0=qElZ=GE=infradead.org=peterz@kernel.org smtp.helo=mail.kernel.org; x-aligned-from=fail; x-category=clean score=-100 state=0; x-ptr=pass x-ptr-helo=mail.kernel.org x-ptr-lookup=mail.kernel.org; x-return-mx=pass smtp.domain=kernel.org smtp.result=pass smtp_is_org_domain=yes header.domain=infradead.org header.result=pass header_is_org_domain=yes; x-tls=pass version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128 X-Remote-Delivered-To: security@kernel.org DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7B0A72077B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=peterz@infradead.org Date: Wed, 14 Mar 2018 21:08:46 +0100 From: Peter Zijlstra To: Bart Van Assche Cc: "tj@kernel.org" , "linux-kernel@vger.kernel.org" , "jannh@google.com" , "bcrl@kvack.org" , "torvalds@linux-foundation.org" , "kernel-team@fb.com" , "security@kernel.org" , "kent.overstreet@gmail.com" , "viro@zeniv.linux.org.uk" , "axboe@kernel.dk" , "paulmck@linux.vnet.ibm.com" Subject: Re: [PATCH 5/7] block: Remove superflous rcu_read_[un]lock_sched() in blk_queue_enter() Message-ID: <20180314200846.GR4064@hirez.programming.kicks-ass.net> References: <20180306172657.3060270-1-tj@kernel.org> <20180306173316.3088458-1-tj@kernel.org> <20180306173316.3088458-5-tj@kernel.org> <1520358769.3578.21.camel@wdc.com> <20180314184636.GC2943022@devbig577.frc2.facebook.com> <1521057929.3006.31.camel@wdc.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1521057929.3006.31.camel@wdc.com> User-Agent: Mutt/1.9.3 (2018-01-21) X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Wed, Mar 14, 2018 at 08:05:30PM +0000, Bart Van Assche wrote: > Can you clarify this further? From : > > static inline void synchronize_rcu(void) > { > synchronize_sched(); > } You'll find that is for !CONFIG_PREEMPT_RCU.