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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 BC2F5C28CC1 for ; Sat, 1 Jun 2019 13:30:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C3DE2747B for ; Sat, 1 Jun 2019 13:30:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559395835; bh=W+mXVN4o7qdgu7foKIesICoUXtgOLDULDim6bbYHyBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SH/v/sHZo+etTgCLvjRZE8LKyyG+eO3PvV0qEzLTt739r+bi0zZbJPvcNh67TfFbZ FHAeNUqa8wVougnUiPjVHMz7Z+6/C01ZuIgLS1xcjZ8eE7iKF9OkMhcmCUW3uEGKvd SOxik629HKAne/Rg1AH7G2DTJKQklTGzl2A97rYY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729942AbfFANae (ORCPT ); Sat, 1 Jun 2019 09:30:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:56662 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729670AbfFAN0Q (ORCPT ); Sat, 1 Jun 2019 09:26:16 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E0375273B8; Sat, 1 Jun 2019 13:26:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559395576; bh=W+mXVN4o7qdgu7foKIesICoUXtgOLDULDim6bbYHyBQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qm01W1DEWjd/oBg3hjfXX+xFRoN+IvPJvvfCu3to2bTN8Ccmpj/BMLe7AORBjxlq+ nNHG5KKUMdzM6PdTHzMJSZNcJjD44PbgYzEBEV23jOW/qJEN6FWy6AE7bpI3xxFQ/t QIappIyfV/FlnPYKlbFOA468bO/Jnv8r8+D6MSBw= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Yue Hu , Andrew Morton , Michal Hocko , Joe Perches , David Rientjes , Dmitry Safonov , Joonsoo Kim , Linus Torvalds , Sasha Levin , linux-mm@kvack.org Subject: [PATCH AUTOSEL 4.4 06/56] mm/cma_debug.c: fix the break condition in cma_maxchunk_get() Date: Sat, 1 Jun 2019 09:25:10 -0400 Message-Id: <20190601132600.27427-6-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190601132600.27427-1-sashal@kernel.org> References: <20190601132600.27427-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yue Hu [ Upstream commit f0fd50504a54f5548eb666dc16ddf8394e44e4b7 ] If not find zero bit in find_next_zero_bit(), it will return the size parameter passed in, so the start bit should be compared with bitmap_maxno rather than cma->count. Although getting maxchunk is working fine due to zero value of order_per_bit currently, the operation will be stuck if order_per_bit is set as non-zero. Link: http://lkml.kernel.org/r/20190319092734.276-1-zbestahu@gmail.com Signed-off-by: Yue Hu Reviewed-by: Andrew Morton Cc: Michal Hocko Cc: Joe Perches Cc: David Rientjes Cc: Dmitry Safonov Cc: Joonsoo Kim Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- mm/cma_debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/cma_debug.c b/mm/cma_debug.c index f8e4b60db1672..da50dab56b700 100644 --- a/mm/cma_debug.c +++ b/mm/cma_debug.c @@ -57,7 +57,7 @@ static int cma_maxchunk_get(void *data, u64 *val) mutex_lock(&cma->lock); for (;;) { start = find_next_zero_bit(cma->bitmap, bitmap_maxno, end); - if (start >= cma->count) + if (start >= bitmap_maxno) break; end = find_next_bit(cma->bitmap, bitmap_maxno, start); maxchunk = max(end - start, maxchunk); -- 2.20.1