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=-9.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 06605C433E1 for ; Tue, 18 Aug 2020 14:19:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D6D9520786 for ; Tue, 18 Aug 2020 14:19:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="PJJrwh3o" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726886AbgHROTt (ORCPT ); Tue, 18 Aug 2020 10:19:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50060 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726612AbgHROTp (ORCPT ); Tue, 18 Aug 2020 10:19:45 -0400 Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63A93C061389 for ; Tue, 18 Aug 2020 07:19:45 -0700 (PDT) Received: by mail-wr1-x442.google.com with SMTP id a5so18462100wrm.6 for ; Tue, 18 Aug 2020 07:19:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=7J/r1E+lQgwxAYRstL7rf8C32+EXOMnod+NMk/hBTHw=; b=PJJrwh3oAQCHYtG1D3/AT1wch3gMDb0LnX7tOl5ZAw03jrQv1wjtZ7aq3JFvygskhT yKCQx6xLh2ZyFzCCdT7s13ourBuPJqI0znwxo/JMtk46hjxMfSXY2OsR8jHBdTdMyJsQ NbjSNCd7MMJPWTuBk6F1DbadYQbVG9LmHt1uQAX5ii3a/b/IH73wobb0eqquCTjZ8ybF HpFiUSfJGh7+1hhEMn+VyEwHKWMb8hBWy7XLccGUQjPe9rJCKUluS05i8dikv8mfi1PG CtJyBPF2Cxee8db8qdgwaVbB35rLsVFrqA7SO9vsx6XMTkbjUwJTcDbDH6BTvtZ/enXg ZZlQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=7J/r1E+lQgwxAYRstL7rf8C32+EXOMnod+NMk/hBTHw=; b=U5oLN6EsGrU9RlxL/iQvC/3Tec+Vd6IpqM60bfbZhhOvp9Oy85WUKZTvbPmns5bp7z D0P8IWqkITRBqGuzvfZX9hvhAn5cVh9WjYf8x+JV9REgtUpxGR6ZgiX3aWznDTQ0w2Zi eyJAIUlWEG755oieOUIk5vaPT9WZlkyukaUbpDIji3f6fLzcz64wBaeg54ISfjaj1sLh P26ndpclecRwfS7cNNfXOlved33GVw7OclCFTZ+xATDMAsMO+mrRs3qVfwHs8avCSc+h gjxXUAxZJ0FXqqmGDe4YgWtZ7lU8w2gnkkoOQ0LtWqRzYT3shsWIjIdMexLnT3wW9vTr /cDw== X-Gm-Message-State: AOAM533GWA/O9jsBF2h8/mGfWog8zrVfS2TOPCRvDvDBabtmxbKGiTLJ blzi9a9Hxaa4/wjHnWdAr7w= X-Google-Smtp-Source: ABdhPJzxT9GBf8wTWBH60WuPWnbzAmw2HJeyQL0biUOSzv5uQPE/uCUdy9ZeBHEyX5vDda9O2/QZZA== X-Received: by 2002:adf:e8cc:: with SMTP id k12mr21199676wrn.2.1597760384066; Tue, 18 Aug 2020 07:19:44 -0700 (PDT) Received: from tsnow ([94.159.146.190]) by smtp.gmail.com with ESMTPSA id t11sm32487327wrs.66.2020.08.18.07.19.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Aug 2020 07:19:43 -0700 (PDT) Date: Tue, 18 Aug 2020 17:19:40 +0300 From: Tomer Samara To: Greg Kroah-Hartman Cc: devel@driverdev.osuosl.org, Todd Kjos , Suren Baghdasaryan , Riley Andrews , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Hridya Valsaraju , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Joel Fernandes , Laura Abbott , Martijn Coenen , Sumit Semwal , Christian Brauner Subject: Re: [PATCH v2 1/4] staging: android: Replace BUG_ON with WARN_ON Message-ID: <20200818141940.GA357037@tsnow> References: <20200818141106.GB562377@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200818141106.GB562377@kroah.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 18, 2020 at 04:11:06PM +0200, Greg Kroah-Hartman wrote: > On Sun, Aug 16, 2020 at 10:23:25PM +0300, Tomer Samara wrote: > > BUG_ON() is replaced with WARN_ON at ion_page_pool.c > > Why? > > > Fixes the following issue: > > Avoid crashing the kernel - try using WARN_ON & recovery code ratherthan BUG() or BUG_ON(). > > Ideally you can get rid of WARN_ON() too, right? > > Many systems run in panic-on-warn mode, so this really does not change > anything. Try fixing this up properly to not crash at all. > You mean by that to just remove the WARN_ON and leave the condition the same? > > > > Signed-off-by: Tomer Samara > > --- > > drivers/staging/android/ion/ion_page_pool.c | 12 ++++++++---- > > 1 file changed, 8 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c > > index 0198b886d906..c1b9eda35c96 100644 > > --- a/drivers/staging/android/ion/ion_page_pool.c > > +++ b/drivers/staging/android/ion/ion_page_pool.c > > @@ -46,11 +46,13 @@ static struct page *ion_page_pool_remove(struct ion_page_pool *pool, bool high) > > struct page *page; > > > > if (high) { > > - BUG_ON(!pool->high_count); > > + if (WARN_ON(!pool->high_count)) > > + return NULL; > > And can you test this that it works properly? > > thanks, > > greg k-h Will do :)