From patchwork Wed Jun 26 12:27:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11017763 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 39D9814C0 for ; Wed, 26 Jun 2019 12:29:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2960A287B1 for ; Wed, 26 Jun 2019 12:29:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1DFE4287B8; Wed, 26 Jun 2019 12:29:20 +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=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 B6A7B287B4 for ; Wed, 26 Jun 2019 12:29:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727498AbfFZM1u (ORCPT ); Wed, 26 Jun 2019 08:27:50 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:42706 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726484AbfFZM1u (ORCPT ); Wed, 26 Jun 2019 08:27:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type: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=0wBvIBHex+/cCiI1pboKPdW0nxKbhC7t4v1/DWHTWzI=; b=c6rggi27+6bcNfZZv1zIRlyPCG dTeW2W12t37x3woY9zWdBtIsP4n1E9dw47beifpdnx/fz2SnFKoQs6M0ObFbnzav7MGUD/YXjCZ/Y /nrVNGsZF9j5DfrhyO6TTdGG/hzYaJp6AQ98WUFsFTaB6Ol4fyNoNVg8mhvpvqgaxZEjbFL/UASiZ /3sLgB2UV5SSt6KHctKLOsDSch/tnc7UKteZTeFrWqxh0JqkYe6iQjKxxaOZL1CYQ9QXxFMmVhNNO 27wXVoCLF43f+0c2qpIsvN2eFaGW98w89wJCDa2RWtuWV5oIL49PGwubBepu8AuvptmiewrxjXd5v 6kqTr2hA==; Received: from clnet-p19-102.ikbnet.co.at ([83.175.77.102] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hg71Z-0001Lv-4k; Wed, 26 Jun 2019 12:27:41 +0000 From: Christoph Hellwig To: Dan Williams , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jason Gunthorpe , Ben Skeggs Cc: linux-mm@kvack.org, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-nvdimm@lists.01.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, John Hubbard Subject: [PATCH 05/25] mm: don't clear ->mapping in hmm_devmem_free Date: Wed, 26 Jun 2019 14:27:04 +0200 Message-Id: <20190626122724.13313-6-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190626122724.13313-1-hch@lst.de> References: <20190626122724.13313-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP ->mapping isn't even used by HMM users, and the field at the same offset in the zone_device part of the union is declared as pad. (Which btw is rather confusing, as DAX uses ->pgmap and ->mapping from two different sides of the union, but DAX doesn't use hmm_devmem_free). Signed-off-by: Christoph Hellwig Reviewed-by: Jason Gunthorpe Reviewed-by: John Hubbard --- mm/hmm.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/mm/hmm.c b/mm/hmm.c index 376159a769fb..e7dd2ab8f9ab 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -1383,8 +1383,6 @@ static void hmm_devmem_free(struct page *page, void *data) { struct hmm_devmem *devmem = data; - page->mapping = NULL; - devmem->ops->free(devmem, page); }