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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 C8C77C433E0 for ; Wed, 17 Jun 2020 16:23:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A36FF21532 for ; Wed, 17 Jun 2020 16:23:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A36FF21532 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 428716B0002; Wed, 17 Jun 2020 12:23:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3D8F16B0005; Wed, 17 Jun 2020 12:23:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2C7AB6B000A; Wed, 17 Jun 2020 12:23:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0004.hostedemail.com [216.40.44.4]) by kanga.kvack.org (Postfix) with ESMTP id 10BF46B0002 for ; Wed, 17 Jun 2020 12:23:07 -0400 (EDT) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 64BC02519B7 for ; Wed, 17 Jun 2020 16:23:06 +0000 (UTC) X-FDA: 76939223172.09.frog30_4a0c71a26e09 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin09.hostedemail.com (Postfix) with ESMTP id B028F18488924 for ; Wed, 17 Jun 2020 16:23:05 +0000 (UTC) X-HE-Tag: frog30_4a0c71a26e09 X-Filterd-Recvd-Size: 1526 Received: from gentwo.org (gentwo.org [3.19.106.255]) by imf22.hostedemail.com (Postfix) with ESMTP for ; Wed, 17 Jun 2020 16:23:05 +0000 (UTC) Received: by gentwo.org (Postfix, from userid 1002) id D2E483E9DB; Wed, 17 Jun 2020 16:23:04 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id D10583E9D1; Wed, 17 Jun 2020 16:23:04 +0000 (UTC) Date: Wed, 17 Jun 2020 16:23:04 +0000 (UTC) From: Christopher Lameter X-X-Sender: cl@www.lameter.com To: William Kucharski cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton Subject: Re: [PATCH] mm: ksize() should silently accept a NULL pointer In-Reply-To: <20200616225409.4670-1-william.kucharski@oracle.com> Message-ID: References: <20200616225409.4670-1-william.kucharski@oracle.com> User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspamd-Queue-Id: B028F18488924 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 16 Jun 2020, William Kucharski wrote: > Other mm routines such as kfree() and kzfree() silently do the right > thing if passed a NULL pointer, so ksize() should do the same. Ok so the size of an no object pointer is zero? Ignoring the freeing of a nonexisting object makes sense. But determining it size?