Received: by 2002:a05:6902:102b:0:0:0:0 with SMTP id x11csp615061ybt; Wed, 17 Jun 2020 09:25:48 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwSl8HYXRPisudgXKJUuO392vaXAiOqq3xELQInv696cG3iJnMRqb56zJNIFeZnaYzKtg3X X-Received: by 2002:aa7:c5c7:: with SMTP id h7mr7849594eds.177.1592411148801; Wed, 17 Jun 2020 09:25:48 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1592411148; cv=none; d=google.com; s=arc-20160816; b=kWZkIR8/3JhHtTLrOnseQ4abbMfcUyAlkZ7QW1ixkAwOVCPNNOxbDVpvVS8fCUVj5k 2MDez5zRb/mWzxMoSGg/BDxedZ13cjCgwjfnyv0czJQB9c3CFMMezcOLJYznX8VxGqkX S5dZ43xZvdoOHks2jIjBaIfbu79cjq6YTj7tuABH8IHr9LzSJyGWT+Maai4alf8lCVqM rtMc67XYUfrLRITrg0nOsz7Xiglf0KMpaNAKpADmoWEhkKXBsMYbDOQBwz4k16eZu/35 GowgfWeJxHpvLKnf5U9uttlKEypufniZUlr8vx/yA5XrDS70Z0ZZ8fQqKpFRrDELvefL 9k1w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:user-agent:references :message-id:in-reply-to:subject:cc:to:from:date; bh=faOsVi62zu+0A9bBh2FPirvI3J1toHjoO2AtCgYsEOE=; b=RdIFDmMbV2wutiRE1ginxgJaayS7zp3f312L8eL2ehovOFeE5y+rXtP9f2LZQM0tXI qOYYTFit39OrSbO1gYeliMi3z0ycIuoB8fxh2U+h4uldhZphgihvE5jUZ1UOqdAi8qlq ZAIu0r00qPAChJVfnFffcv0VuOQTorAUMX4uUGsljO5Nd4wDREGP4TTVvhAK1FOOlW49 LPzmfz12xzItlrbVSblMbI8vMshJXlTf3tDG8GzJz8wzAir7G4ih0T+m2Ss5+mAOCDkb Qd1NGLMa0PpIGkJGjm2A/lntLSQOrDVfknXpjIMEOC//YJHkBgs4rpWBYZrtJuK3af78 aOdg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id u15si254543edq.598.2020.06.17.09.25.25; Wed, 17 Jun 2020 09:25:48 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726848AbgFQQXF (ORCPT + 99 others); Wed, 17 Jun 2020 12:23:05 -0400 Received: from gentwo.org ([3.19.106.255]:38672 "EHLO gentwo.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726329AbgFQQXF (ORCPT ); Wed, 17 Jun 2020 12:23:05 -0400 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 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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?