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=-8.5 required=3.0 tests=INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_MUTT 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 5BC4AC43441 for ; Fri, 16 Nov 2018 08:39:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2AC102089D for ; Fri, 16 Nov 2018 08:39:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2AC102089D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389293AbeKPSvG (ORCPT ); Fri, 16 Nov 2018 13:51:06 -0500 Received: from mx2.suse.de ([195.135.220.15]:52392 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727543AbeKPSvG (ORCPT ); Fri, 16 Nov 2018 13:51:06 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 31778AB64; Fri, 16 Nov 2018 08:39:44 +0000 (UTC) Date: Fri, 16 Nov 2018 09:39:42 +0100 From: Michal Hocko To: Masahiro Yamada Cc: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] slab: fix 'dubious: x & !y' warning from Sparse Message-ID: <20181116083942.GA14767@dhcp22.suse.cz> References: <1542346829-31063-1-git-send-email-yamada.masahiro@socionext.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1542346829-31063-1-git-send-email-yamada.masahiro@socionext.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri 16-11-18 14:40:29, Masahiro Yamada wrote: > Sparse reports: > ./include/linux/slab.h:332:43: warning: dubious: x & !y JFYI this has been discussed here http://lkml.kernel.org/r/20181105204000.129023-1-bvanassche@acm.org > Signed-off-by: Masahiro Yamada > --- > > include/linux/slab.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/linux/slab.h b/include/linux/slab.h > index 918f374..d395c73 100644 > --- a/include/linux/slab.h > +++ b/include/linux/slab.h > @@ -329,7 +329,7 @@ static __always_inline enum kmalloc_cache_type kmalloc_type(gfp_t flags) > * If an allocation is both __GFP_DMA and __GFP_RECLAIMABLE, return > * KMALLOC_DMA and effectively ignore __GFP_RECLAIMABLE > */ > - return type_dma + (is_reclaimable & !is_dma) * KMALLOC_RECLAIM; > + return type_dma + (is_reclaimable && !is_dma) * KMALLOC_RECLAIM; > } > > /* > -- > 2.7.4 -- Michal Hocko SUSE Labs