From patchwork Mon Jul 1 06:20:03 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11024941 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 3DB5E1580 for ; Mon, 1 Jul 2019 06:20:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 405CB28113 for ; Mon, 1 Jul 2019 06:20:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 34659284B3; Mon, 1 Jul 2019 06:20:41 +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=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 A08F028173 for ; Mon, 1 Jul 2019 06:20:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726869AbfGAGUi (ORCPT ); Mon, 1 Jul 2019 02:20:38 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:48210 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727516AbfGAGUh (ORCPT ); Mon, 1 Jul 2019 02:20:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Sender:Reply-To: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=aDDV0kJ/bs5He1sJYNTcx8QRyDKaqv7PRbW2xYMan0w=; b=SRjdRB90aDp9ri+nwpQyyHN9q qGQh2uFv5+oBVnpCH4SJ+S82Wpl/5WlkHeVnbWe5AlpG9jmwibSgKOUPVlmKBymW6MzbzMs+Z5o5x Ggnd73UXr0J0EaH1JLkQ+tGELOwpt6iVaxq/8Lv9lorXyp9nYihVahCxuZEkCLErZAFZV/QTwiXbj oiqBjQ3hmd4hDDsYPsDc5xc2RtHEVg21y2T/8EgBWohFixCBg5aFXa4NXJZnpcyUlA/vxFRjuIkQg kNIQKzf0Emx+NwpXszIeVaqahmKQdjRNxfXxrmrM0Gmy6pasBag0nyerbXo0boyU6/Q3xNOwrjEQY 5fLWM2pmQ==; Received: from [46.140.178.35] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hhpg1-0002tx-JM; Mon, 01 Jul 2019 06:20:33 +0000 From: Christoph Hellwig To: Dan Williams , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jason Gunthorpe , Ben Skeggs Cc: Ira Weiny , 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, "Kuehling, Felix" Subject: [PATCH 05/22] mm/hmm: Only set FAULT_FLAG_ALLOW_RETRY for non-blocking Date: Mon, 1 Jul 2019 08:20:03 +0200 Message-Id: <20190701062020.19239-6-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190701062020.19239-1-hch@lst.de> References: <20190701062020.19239-1-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 From: "Kuehling, Felix" Don't set this flag by default in hmm_vma_do_fault. It is set conditionally just a few lines below. Setting it unconditionally can lead to handle_mm_fault doing a non-blocking fault, returning -EBUSY and unlocking mmap_sem unexpectedly. Signed-off-by: Felix Kuehling Reviewed-by: Jérôme Glisse Signed-off-by: Jason Gunthorpe --- mm/hmm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/hmm.c b/mm/hmm.c index dce4e70e648a..826816ab2377 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -328,7 +328,7 @@ struct hmm_vma_walk { static int hmm_vma_do_fault(struct mm_walk *walk, unsigned long addr, bool write_fault, uint64_t *pfn) { - unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_REMOTE; + unsigned int flags = FAULT_FLAG_REMOTE; struct hmm_vma_walk *hmm_vma_walk = walk->private; struct hmm_range *range = hmm_vma_walk->range; struct vm_area_struct *vma = walk->vma;