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[156.34.55.100]) by smtp.gmail.com with ESMTPSA id y3sm20100502qtj.46.2019.07.22.09.04.49 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 22 Jul 2019 09:04:49 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1hpanw-00059A-U7; Mon, 22 Jul 2019 13:04:48 -0300 Date: Mon, 22 Jul 2019 13:04:48 -0300 From: Jason Gunthorpe To: "Paul E. McKenney" Cc: "Michael S. Tsirkin" , Matthew Wilcox , aarcange@redhat.com, akpm@linux-foundation.org, christian@brauner.io, davem@davemloft.net, ebiederm@xmission.com, elena.reshetova@intel.com, guro@fb.com, hch@infradead.org, james.bottomley@hansenpartnership.com, jasowang@redhat.com, jglisse@redhat.com, keescook@chromium.org, ldv@altlinux.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-parisc@vger.kernel.org, luto@amacapital.net, mhocko@suse.com, mingo@kernel.org, namit@vmware.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, wad@chromium.org Subject: Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop) Message-ID: <20190722160448.GH7607@ziepe.ca> References: <000000000000964b0d058e1a0483@google.com> <20190721044615-mutt-send-email-mst@kernel.org> <20190721081933-mutt-send-email-mst@kernel.org> <20190721131725.GR14271@linux.ibm.com> <20190721210837.GC363@bombadil.infradead.org> <20190721233113.GV14271@linux.ibm.com> <20190722035042-mutt-send-email-mst@kernel.org> <20190722115149.GY14271@linux.ibm.com> <20190722134152.GA13013@ziepe.ca> <20190722155235.GF14271@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190722155235.GF14271@linux.ibm.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-parisc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-parisc@vger.kernel.org On Mon, Jul 22, 2019 at 08:52:35AM -0700, Paul E. McKenney wrote: > So why then is there a problem? I'm not sure there is a real problem, I thought Michael was just asking how to design with RCU in the case where the user controls the kfree_rcu?? Sounds like the answer is "don't worry about it" ? Thanks, Jason From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0D21C76190 for ; Mon, 22 Jul 2019 16:05:00 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C3D17218EA for ; Mon, 22 Jul 2019 16:05:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Kh1KqqYC"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=ziepe.ca header.i=@ziepe.ca header.b="eCJDQVgp" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C3D17218EA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ziepe.ca Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Hh2vIO57FwpNLNzik56+tiO6vWCKPlfYhuaAFtA5T6Y=; b=Kh1KqqYC877y0r XYrbfmZ61A/2VO2ZDLFUFT4I8CxgKcOfPWc8vmdM2HpHsF0ax5GoeAm2oeRK9kaPK1pWeSZQbB6Zv rI2UfTGhAq4EjooKzlhaa25PMG41t38eCkuc3mBDONh+hsEpoT4LdGZ8+Ywq1vaQ8eQ4UlYj5uvsp 0LnqWYCbr5RQARgherIArusc0YtGAkyTJyrVD7tLCHYBCLbe0Y/oM5tI+8FmoM/8FnVeFGe1yjERf sgSph77ew43d94p1PzbzeF36fPLpm6FxjcqA/VdxBly8C/2buycRrHJHvUZgwXo+DU7LhGG4W8SrN oktRlPFr4OBbLveDB1qQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hpao7-0007JO-Tx; Mon, 22 Jul 2019 16:04:59 +0000 Received: from mail-qt1-x844.google.com ([2607:f8b0:4864:20::844]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hpao0-0007EG-Nz for linux-arm-kernel@lists.infradead.org; Mon, 22 Jul 2019 16:04:56 +0000 Received: by mail-qt1-x844.google.com with SMTP id r6so34820562qtt.0 for ; Mon, 22 Jul 2019 09:04:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ziepe.ca; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=vwvk1p704PvrHoU3x+syVrBIr03+GtruOtffq5nOmqI=; b=eCJDQVgp/TUa3SJDw5YNpJdxoRLDUf0uKWF8HiEN2E6tOilw6te7IXdJ74mZFUYqp/ 9cs4iQsc0KiVAOncyf/4OEnDeZsuNdAdxwUKQmiZzySVbAR5OjTuhXiGRkV1rgBYswjM IQx0Ulu4NMDBwDAviDS9g4pKXJW+xpv+Iy8d6aVLlz84ufr1JzYd1aeEamQT0VorPgKU QT1i21qMa2c8H2+8UBfm4o25QcGgTYS7VKw/3eTMHAe7UkpWzGXLekAdlCSWusHGhsa8 cEkwa4My8xWUN30i19bWw4qGMFPnC91vuvyuUJqr/Slt5ziIHR7WpgLw+5d/ULuZjsfk lFPA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=vwvk1p704PvrHoU3x+syVrBIr03+GtruOtffq5nOmqI=; b=HvA0tYpEaNoKkWGb8ptwyn8iJhP32KbTH8E8RG4Sar9XwpqMf261qQtNv4GQbGGjzV UlhgTOJVcLZde3sBhI71mXnkOlMxRLKdqqm+03lOOSjlWHXOTPCCdv5zOrciAqyCEC6C Tc5mdZi3GgvHwhSTaLDhL+yVUxM7DngTPTnT0RW1g9NbILR5M03w5IsR7V0UkBgBFrxP Ez/Q9oQZq46UJsN3ToHHDk4awkOWXT9n0Ox6GCVJoFpGW5+myYLyMCnuue1LNKDrfdWM h0I73r+8uqrHnvYL0+s3q5Ra79GSS3ZmRrFLWzOxY1uC0hygjdMDSHIZHLia0EF0mg31 ozAQ== X-Gm-Message-State: APjAAAUznoSnxaEAnzWGgKfxy7FiafRKqfxWWMa8JDNcAvfeP6sd1TjS e4oY7s4CA6fxYYoS05CRg/ghJA== X-Google-Smtp-Source: APXvYqwAqmiUCOGD8gRTdb/gKf382wokrezGvhSEToPpHN31WEGoX97JjGxgPReHba9ZDH0CrbO+rw== X-Received: by 2002:ac8:431e:: with SMTP id z30mr50035442qtm.291.1563811490053; Mon, 22 Jul 2019 09:04:50 -0700 (PDT) Received: from ziepe.ca (hlfxns017vw-156-34-55-100.dhcp-dynamic.fibreop.ns.bellaliant.net. [156.34.55.100]) by smtp.gmail.com with ESMTPSA id y3sm20100502qtj.46.2019.07.22.09.04.49 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 22 Jul 2019 09:04:49 -0700 (PDT) Received: from jgg by mlx.ziepe.ca with local (Exim 4.90_1) (envelope-from ) id 1hpanw-00059A-U7; Mon, 22 Jul 2019 13:04:48 -0300 Date: Mon, 22 Jul 2019 13:04:48 -0300 From: Jason Gunthorpe To: "Paul E. McKenney" Subject: Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop) Message-ID: <20190722160448.GH7607@ziepe.ca> References: <000000000000964b0d058e1a0483@google.com> <20190721044615-mutt-send-email-mst@kernel.org> <20190721081933-mutt-send-email-mst@kernel.org> <20190721131725.GR14271@linux.ibm.com> <20190721210837.GC363@bombadil.infradead.org> <20190721233113.GV14271@linux.ibm.com> <20190722035042-mutt-send-email-mst@kernel.org> <20190722115149.GY14271@linux.ibm.com> <20190722134152.GA13013@ziepe.ca> <20190722155235.GF14271@linux.ibm.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190722155235.GF14271@linux.ibm.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190722_090452_852457_84443E55 X-CRM114-Status: UNSURE ( 8.77 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mhocko@suse.com, "Michael S. Tsirkin" , peterz@infradead.org, jasowang@redhat.com, ldv@altlinux.org, james.bottomley@hansenpartnership.com, linux-mm@kvack.org, namit@vmware.com, mingo@kernel.org, elena.reshetova@intel.com, aarcange@redhat.com, davem@davemloft.net, Matthew Wilcox , hch@infradead.org, linux-arm-kernel@lists.infradead.org, keescook@chromium.org, syzkaller-bugs@googlegroups.com, jglisse@redhat.com, viro@zeniv.linux.org.uk, christian@brauner.io, wad@chromium.org, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, luto@amacapital.net, ebiederm@xmission.com, akpm@linux-foundation.org, guro@fb.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Jul 22, 2019 at 08:52:35AM -0700, Paul E. McKenney wrote: > So why then is there a problem? I'm not sure there is a real problem, I thought Michael was just asking how to design with RCU in the case where the user controls the kfree_rcu?? Sounds like the answer is "don't worry about it" ? Thanks, Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel