From patchwork Wed Jan 17 20:21:06 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matthew Wilcox (Oracle)" X-Patchwork-Id: 10172629 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 0065B60230 for ; Thu, 18 Jan 2018 09:44:55 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E6DC125D99 for ; Thu, 18 Jan 2018 09:44:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DA3D42623D; Thu, 18 Jan 2018 09:44:54 +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=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id A4BB225D99 for ; Thu, 18 Jan 2018 09:44:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D9AE16E596; Thu, 18 Jan 2018 09:40:20 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0265E6E1C4 for ; Wed, 17 Jan 2018 20:22:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=qLryO9+ckcDAdADvQbQXMn1DhH2IKMDVdBwW6eaBbws=; b=mtqqyA7BoBPFAs0Pc0wvPUgc+ D1cB3no+wuj6QyBHAly8aT1EpNsI1vJdnysyY5r1LjlQTaZoEADudRAgfaN0Q+T2Xl/Vkb911/jWw GmH3gWpfiOH58oAi2eFvzKhAdoHao/iXwAmQSMVaHTLXXEmX3UB+0GiTQ5VxIjVndF560nkdERU4z Fg4/RjcrzbLTCQ6vhchpIICxsbQCDYWW59CX0p+8py6Vc/+tqorVlbXCwi/Wp98Ts2V5ADM8dtevW FC+RwgnAe9TfFDc7t+NV4mVpsTUk5c4pXO57uxO1WB1iizW2+TCude8Y1aWAuNEdkQ7N8d5+5H47J R0HLwC2/w==; Received: from willy by bombadil.infradead.org with local (Exim 4.89 #1 (Red Hat Linux)) id 1ebuEL-0005tH-CS; Wed, 17 Jan 2018 20:22:41 +0000 From: Matthew Wilcox To: linux-kernel@vger.kernel.org Date: Wed, 17 Jan 2018 12:21:06 -0800 Message-Id: <20180117202203.19756-43-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180117202203.19756-1-willy@infradead.org> References: <20180117202203.19756-1-willy@infradead.org> Cc: linux-s390@vger.kernel.org, David Howells , linux-nilfs@vger.kernel.org, Matthew Wilcox , linux-sh@vger.kernel.org, intel-gfx@lists.freedesktop.org, linux-usb@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-xfs@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, Stefano Stabellini , linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org, Bjorn Andersson , linux-btrfs@vger.kernel.org Subject: [Intel-gfx] [PATCH v6 42/99] shmem: Convert shmem_confirm_swap to XArray X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP From: Matthew Wilcox xa_load has its own RCU locking, so we can eliminate it here. Signed-off-by: Matthew Wilcox --- mm/shmem.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index fad6c9e7402e..654f367aca90 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -348,12 +348,7 @@ static int shmem_xa_replace(struct address_space *mapping, static bool shmem_confirm_swap(struct address_space *mapping, pgoff_t index, swp_entry_t swap) { - void *item; - - rcu_read_lock(); - item = radix_tree_lookup(&mapping->pages, index); - rcu_read_unlock(); - return item == swp_to_radix_entry(swap); + return xa_load(&mapping->pages, index) == swp_to_radix_entry(swap); } /*