From patchwork Fri May 11 19:06:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jean-Philippe Brucker X-Patchwork-Id: 10395171 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 761A9601A0 for ; Fri, 11 May 2018 19:19:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 735BF28E55 for ; Fri, 11 May 2018 19:19:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6472528F49; Fri, 11 May 2018 19:19:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id BBCCC28E55 for ; Fri, 11 May 2018 19:19:22 +0000 (UTC) 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=zvZlXLR2cDTOLPBFBcqbuZWHf1pe+XKRNKFm3Ebi6Tk=; b=BN5ZAJxzBxR1O31NOABZrgL5ar 048MZ174wTZV4JdDOE5sYBx27lptDOcW/XZ8oEd3LInOPukwBpahFWbOnBYibctLoq0IdLzHTGUAg DmK4phCL+eMCxICx4Gra4eEAD1YDVsm5dL7ue6YmLkdtMYMuMb62XX4d3YOf1tD550Btzy8bnybIx eNEGxx5bTH/1EOhpkqquHdhmx4FRHoZki6oZr0HQNa6jroSIe8gLGzZypcN28BuheYFdzupHw7Ti1 USoTqEwApEPwublEmZmqmK705euOJutpGYpbRa3YpzCFotg5qDOS2vBtRXtf5sdceaEqdorj0h+GF p/7pVYOA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fHDZM-00047O-4K; Fri, 11 May 2018 19:19:08 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1fHDPH-0005W6-H6 for linux-arm-kernel@lists.infradead.org; Fri, 11 May 2018 19:08:51 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 899F81993; Fri, 11 May 2018 12:08:38 -0700 (PDT) Received: from ostrya.cambridge.arm.com (ostrya.cambridge.arm.com [10.1.210.33]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 1FC0C3F23C; Fri, 11 May 2018 12:08:32 -0700 (PDT) From: Jean-Philippe Brucker To: linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 12/40] mm: export symbol mmput_async Date: Fri, 11 May 2018 20:06:13 +0100 Message-Id: <20180511190641.23008-13-jean-philippe.brucker@arm.com> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180511190641.23008-1-jean-philippe.brucker@arm.com> References: <20180511190641.23008-1-jean-philippe.brucker@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180511_120843_702491_91250175 X-CRM114-Status: GOOD ( 10.95 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: xieyisheng1@huawei.com, liubo95@huawei.com, xuzaibo@huawei.com, thunder.leizhen@huawei.com, will.deacon@arm.com, okaya@codeaurora.org, yi.l.liu@intel.com, ashok.raj@intel.com, tn@semihalf.com, joro@8bytes.org, bharatku@xilinx.com, liudongdong3@huawei.com, rfranz@cavium.com, kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, jcrouse@codeaurora.org, rgummal@xilinx.com, jonathan.cameron@huawei.com, shunyong.yang@hxt-semitech.com, robin.murphy@arm.com, ilias.apalodimas@linaro.org, alex.williamson@redhat.com, robdclark@gmail.com, akpm@linux-foundation.org, dwmw2@infradead.org, christian.koenig@amd.com, nwatters@codeaurora.org, baolu.lu@linux.intel.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP In some cases releasing a mm bound to a device might invoke an exit handler, that takes a lock already held by the function calling mmput(). This is the case for VFIO, which needs to call mmput_async to avoid a deadlock. Other drivers using SVA might follow. Since they can be built as modules, export the mmput_async symbol. Cc: akpm@linux-foundation.org Signed-off-by: Jean-Philippe Brucker --- kernel/fork.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/fork.c b/kernel/fork.c index 1062f7450e97..bf05d188c8de 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -999,6 +999,7 @@ void mmput_async(struct mm_struct *mm) schedule_work(&mm->async_put_work); } } +EXPORT_SYMBOL_GPL(mmput_async); #endif /**