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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 9CDB7C2D0DB for ; Mon, 20 Jan 2020 12:13:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7922E20882 for ; Mon, 20 Jan 2020 12:13:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726974AbgATMNG (ORCPT ); Mon, 20 Jan 2020 07:13:06 -0500 Received: from mga04.intel.com ([192.55.52.120]:28226 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726573AbgATMNG (ORCPT ); Mon, 20 Jan 2020 07:13:06 -0500 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Jan 2020 04:13:05 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,342,1574150400"; d="scan'208";a="399356972" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by orsmga005.jf.intel.com with ESMTP; 20 Jan 2020 04:13:04 -0800 Date: Mon, 20 Jan 2020 20:13:15 +0800 From: Wei Yang To: Anshuman Khandual Cc: Wei Yang , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, rientjes@google.com Subject: Re: [Patch v2 2/4] mm/page_alloc.c: bad_[reason|flags] is not necessary when PageHWPoison Message-ID: <20200120121315.GC18028@richard> Reply-To: Wei Yang References: <20200120030415.15925-1-richardw.yang@linux.intel.com> <20200120030415.15925-3-richardw.yang@linux.intel.com> <3e7b4045-cd22-552a-c28d-1605a97bbdf7@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3e7b4045-cd22-552a-c28d-1605a97bbdf7@arm.com> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jan 20, 2020 at 11:58:04AM +0530, Anshuman Khandual wrote: > > >On 01/20/2020 08:34 AM, Wei Yang wrote: >> Since function returns directly, bad_[reason|flags] is not used any >> where. >> >> This is a following cleanup for commit e570f56cccd21 ("mm: >> check_new_page_bad() directly returns in __PG_HWPOISON case") >> >> Signed-off-by: Wei Yang >> Acked-by: David Rientjes >> --- >> mm/page_alloc.c | 2 -- >> 1 file changed, 2 deletions(-) >> >> diff --git a/mm/page_alloc.c b/mm/page_alloc.c >> index 0cf6218aaba7..a43b9d2482f2 100644 >> --- a/mm/page_alloc.c >> +++ b/mm/page_alloc.c >> @@ -2051,8 +2051,6 @@ static void check_new_page_bad(struct page *page) >> if (unlikely(page_ref_count(page) != 0)) >> bad_reason = "nonzero _refcount"; >> if (unlikely(page->flags & __PG_HWPOISON)) { >> - bad_reason = "HWPoisoned (hardware-corrupted)"; >> - bad_flags = __PG_HWPOISON; >> /* Don't complain about hwpoisoned pages */ >> page_mapcount_reset(page); /* remove PageBuddy */ >> return; > >This bail out condition should be the first in the function >check_new_page_bad() before evaluating bad_[reason|flags] >as they will never be used. > This is reasonable. >> -- Wei Yang Help you, Help me