From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2ECD5C43218 for ; Tue, 11 Jun 2019 14:42:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 06C1021773 for ; Tue, 11 Jun 2019 14:42:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="rr+6i7rP" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391736AbfFKOmG (ORCPT ); Tue, 11 Jun 2019 10:42:06 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:37826 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391705AbfFKOmA (ORCPT ); Tue, 11 Jun 2019 10:42:00 -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=92m0mWNJuHmY5cYpWlooP/cZgBBhq6eJcxducqZ88IQ=; b=rr+6i7rPu5se1K/u84C05O1tdY GzqfoR4ThRZnBYykD/g3PZVO7wt8FMplFhvZc9xK09NnOLWoT3OfPdCMgF6j8idQ5hVx9Llo1V/aA gkylDbMT/JiY3hZo9qmZ7jM0kZrPGMqnbWcr+ylPSRBycRzfkVl6yoTaZ1ZcJXTyhNuZUVuhmKdkL 39NSJ31ih14hQPhzjcZ3GtnHRqtmiZsoUO6nKeiz7ttH5Iuyf6If7xjguwIwAwHBQreLYaFo0nkc2 q9x/QDp+b7OsLJTf33M2uFsaCD+JFkB+KMn94HytN+qVUEV+oOEb6fRveAy1MReAX/mRXtPMLUcHi LLWRbdIw==; Received: from mpp-cp1-natpool-1-037.ethz.ch ([82.130.71.37] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hahy7-0005mk-T7; Tue, 11 Jun 2019 14:41:48 +0000 From: Christoph Hellwig To: Linus Torvalds , Paul Burton , James Hogan , Yoshinori Sato , Rich Felker , "David S. Miller" Cc: Nicholas Piggin , Khalid Aziz , Andrey Konovalov , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , linux-mips@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 14/16] mm: switch gup_hugepte to use try_get_compound_head Date: Tue, 11 Jun 2019 16:41:00 +0200 Message-Id: <20190611144102.8848-15-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190611144102.8848-1-hch@lst.de> References: <20190611144102.8848-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This applies the overflow fixes from 8fde12ca79aff ("mm: prevent get_user_pages() from overflowing page refcount") to the powerpc hugepd code and brings it back in sync with the other GUP cases. Signed-off-by: Christoph Hellwig --- mm/gup.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/gup.c b/mm/gup.c index 494aa4c3a55e..0733674b539d 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -2007,7 +2007,8 @@ static int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, refs++; } while (addr += PAGE_SIZE, addr != end); - if (!page_cache_add_speculative(head, refs)) { + head = try_get_compound_head(head, refs); + if (!head) { *nr -= refs; return 0; } -- 2.20.1