From patchwork Wed Jan 17 20:21:05 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matthew Wilcox X-Patchwork-Id: 10171481 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 E3619603ED for ; Wed, 17 Jan 2018 20:52:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D6001204BE for ; Wed, 17 Jan 2018 20:52:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CAA6C20602; Wed, 17 Jan 2018 20:52:40 +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 7D94D204BE for ; Wed, 17 Jan 2018 20:52:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932374AbeAQUwR (ORCPT ); Wed, 17 Jan 2018 15:52:17 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:56035 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753657AbeAQUWm (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=ay6KUk7TfNJWncBnPIzG9Ycs/W2xRNBkPYNgt9l3/MA=; b=uw9cbbUhpWrXlnAHslZ4zWGXy RqWdq0A/mcP9gF7A/a5l/atLPmaoPzDT8XJpsZFDagvgWTwJEbndo0dAgSLMqASJwzh1z2T16cRM/ DLIniXKfSoouX4AKT9dhy+O1biaS6wWErvuqq3rt1JeFZggeM/6f9KOcstdMrq81nj7vKN/s/VtMf 5NRMmmV5q5kh0WjDizrMmi9E86v5YCYBLVsCPTDI3oqmvy/T+NjsVUlkmJXcWbB6X/lqTKDfFM6eo 9memZWLtkHybJzR9ixmB94QMBxQsSDQTmIeW/Yv+Tikr633JIft/miFSxshLwO27hBgvdn1Ccl1WE WqQKPSCKA==; Received: from willy by bombadil.infradead.org with local (Exim 4.89 #1 (Red Hat Linux)) id 1ebuEK-0005si-Rx; Wed, 17 Jan 2018 20:22:40 +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 41/99] shmem: Convert replace to XArray Date: Wed, 17 Jan 2018 12:21:05 -0800 Message-Id: <20180117202203.19756-42-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 shmem_radix_tree_replace() is renamed to shmem_xa_replace() and converted to use the XArray API. Signed-off-by: Matthew Wilcox --- mm/shmem.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index c5731bb954a1..fad6c9e7402e 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -321,24 +321,20 @@ void shmem_uncharge(struct inode *inode, long pages) } /* - * Replace item expected in radix tree by a new item, while holding tree lock. + * Replace item expected in xarray by a new item, while holding xa_lock. */ -static int shmem_radix_tree_replace(struct address_space *mapping, +static int shmem_xa_replace(struct address_space *mapping, pgoff_t index, void *expected, void *replacement) { - struct radix_tree_node *node; - void **pslot; + XA_STATE(xas, &mapping->pages, index); void *item; VM_BUG_ON(!expected); VM_BUG_ON(!replacement); - item = __radix_tree_lookup(&mapping->pages, index, &node, &pslot); - if (!item) - return -ENOENT; + item = xas_load(&xas); if (item != expected) return -ENOENT; - __radix_tree_replace(&mapping->pages, node, pslot, - replacement, NULL); + xas_store(&xas, replacement); return 0; } @@ -605,8 +601,7 @@ static int shmem_add_to_page_cache(struct page *page, } else if (!expected) { error = radix_tree_insert(&mapping->pages, index, page); } else { - error = shmem_radix_tree_replace(mapping, index, expected, - page); + error = shmem_xa_replace(mapping, index, expected, page); } if (!error) { @@ -635,7 +630,7 @@ static void shmem_delete_from_page_cache(struct page *page, void *radswap) VM_BUG_ON_PAGE(PageCompound(page), page); xa_lock_irq(&mapping->pages); - error = shmem_radix_tree_replace(mapping, page->index, page, radswap); + error = shmem_xa_replace(mapping, page->index, page, radswap); page->mapping = NULL; mapping->nrpages--; __dec_node_page_state(page, NR_FILE_PAGES); @@ -1550,8 +1545,7 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp, * a nice clean interface for us to replace oldpage by newpage there. */ xa_lock_irq(&swap_mapping->pages); - error = shmem_radix_tree_replace(swap_mapping, swap_index, oldpage, - newpage); + error = shmem_xa_replace(swap_mapping, swap_index, oldpage, newpage); if (!error) { __inc_node_page_state(newpage, NR_FILE_PAGES); __dec_node_page_state(oldpage, NR_FILE_PAGES);