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 X-Patchwork-Id: 10171511 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 C9D94603ED for ; Wed, 17 Jan 2018 20:54:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BB529228C8 for ; Wed, 17 Jan 2018 20:54:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AF83423201; Wed, 17 Jan 2018 20:54:02 +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=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 699EC228C8 for ; Wed, 17 Jan 2018 20:54:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754864AbeAQUxG (ORCPT ); Wed, 17 Jan 2018 15:53:06 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:36093 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753655AbeAQUWm (ORCPT ); Wed, 17 Jan 2018 15:22:42 -0500 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 Cc: Matthew Wilcox , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-usb@vger.kernel.org, Bjorn Andersson , Stefano Stabellini , iommu@lists.linux-foundation.org, linux-remoteproc@vger.kernel.org, linux-s390@vger.kernel.org, intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org, linux-sh@vger.kernel.org, David Howells Subject: [PATCH v6 42/99] shmem: Convert shmem_confirm_swap to XArray 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> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org 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); } /*