From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id 43A07280266 for ; Tue, 27 Sep 2016 02:07:22 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id c84so9486635pfj.2 for ; Mon, 26 Sep 2016 23:07:22 -0700 (PDT) Received: from sender153-mail.zoho.com (sender153-mail.zoho.com. [74.201.84.153]) by mx.google.com with ESMTPS id ra7si1079840pab.39.2016.09.26.23.07.21 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 26 Sep 2016 23:07:21 -0700 (PDT) Subject: Re: [PATCH 1/5] mm/vmalloc.c: correct a few logic error for __insert_vmap_area() References: <57E20B54.5020408@zoho.com> <034db3ec-e2dc-a6da-6dab-f0803900e19d@zoho.com> From: zijun_hu Message-ID: <57EA0C86.3010303@zoho.com> Date: Tue, 27 Sep 2016 14:07:02 +0800 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: David Rientjes Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, zijun_hu@htc.com, Andrew Morton , tj@kernel.org, mingo@kernel.org, iamjoonsoo.kim@lge.com, mgorman@techsingularity.net On 09/22/2016 07:15 AM, David Rientjes wrote: > On Thu, 22 Sep 2016, zijun_hu wrote: > >>> We don't support inserting when va->va_start == tmp_va->va_end, plain and >>> simple. There's no reason to do so. NACK to the patch. >>> >> i am sorry i disagree with you because >> 1) in almost all context of vmalloc, original logic treat the special case as normal >> for example, __find_vmap_area() or alloc_vmap_area() > > The ranges are [start, end) like everywhere else. __find_vmap_area() is > implemented as such for the passed address. The address is aligned in > alloc_vmap_area(), there's no surprise here. The logic is correct in > __insert_vmap_area(). > i am sorry to disagree with you i will resend this patch with more detailed illustration -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org