From patchwork Mon Feb 19 19:45:40 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 10228637 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 3C3C6602B1 for ; Mon, 19 Feb 2018 19:51:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2E98028B96 for ; Mon, 19 Feb 2018 19:51:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2D8AB28B99; Mon, 19 Feb 2018 19:51:59 +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=unavailable 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 9650B28B96 for ; Mon, 19 Feb 2018 19:51:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753878AbeBSTvn (ORCPT ); Mon, 19 Feb 2018 14:51:43 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:44970 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753797AbeBSTq0 (ORCPT ); Mon, 19 Feb 2018 14:46:26 -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=lJWmUt0DkBujde6RXQBAWxdPhSSmSlLgtyFEWc2f49g=; b=b1coaiMTPRsR3O8Xtq3YRavEg maB8fC4CxrGL90geCxfAagDGGoJff4on0Ijou7Swyaw4QNpZqFSqwkC09ORP3TrHO5vPs1V4bRa09 lWo5BPhgpqaAd1j6pKnDxWfY1YEebqCA6LqEgdlOnn3XkbYURkB5UDQXNJTITosCd+klamxnbMrAG OVE2oxmiXl1dh3ZSQRjtGoWUOBOpy0PMNfQKg7vvbZcgV/uTpbmRyG7W5k6v/sJjLo7Pdthox5Lzk 4QeRiGn/qrXZWdHo6en7KkUBemJqRTz0oqgAw4mF3WAw4QOa4hH4bYCJM/QhGAp29E0U6ZfvhfDHW VLZakHV+A==; Received: from willy by bombadil.infradead.org with local (Exim 4.89 #1 (Red Hat Linux)) id 1enrOK-0001u5-UD; Mon, 19 Feb 2018 19:46:24 +0000 From: Matthew Wilcox To: Andrew Morton Cc: Matthew Wilcox , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v7 45/61] shmem: Convert shmem_confirm_swap to XArray Date: Mon, 19 Feb 2018 11:45:40 -0800 Message-Id: <20180219194556.6575-46-willy@infradead.org> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180219194556.6575-1-willy@infradead.org> References: <20180219194556.6575-1-willy@infradead.org> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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 a8db3241f826..25a8e611bf1b 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); } /*