From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f174.google.com (mail-ob0-f174.google.com [209.85.214.174]) by kanga.kvack.org (Postfix) with ESMTP id 365BC6B006E for ; Fri, 21 Nov 2014 00:25:39 -0500 (EST) Received: by mail-ob0-f174.google.com with SMTP id m8so3452571obr.33 for ; Thu, 20 Nov 2014 21:25:39 -0800 (PST) Received: from mail-ob0-x22d.google.com (mail-ob0-x22d.google.com. [2607:f8b0:4003:c01::22d]) by mx.google.com with ESMTPS id y7si2780512oej.107.2014.11.20.21.25.38 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 20 Nov 2014 21:25:38 -0800 (PST) Received: by mail-ob0-f173.google.com with SMTP id uy5so3473132obc.4 for ; Thu, 20 Nov 2014 21:25:38 -0800 (PST) MIME-Version: 1.0 In-Reply-To: <20141121034355.GA10123@bbox> References: <1416488913-9691-1-git-send-email-opensource.ganesh@gmail.com> <20141121034355.GA10123@bbox> Date: Fri, 21 Nov 2014 13:25:37 +0800 Message-ID: Subject: Re: [PATCH] mm/zsmalloc: avoid duplicate assignment of prev_class From: Ganesh Mahendran Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: Minchan Kim Cc: Nitin Gupta , iamjoonsoo.kim@lge.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Hello 2014-11-21 11:43 GMT+08:00 Minchan Kim : > On Thu, Nov 20, 2014 at 09:08:33PM +0800, Mahendran Ganesh wrote: >> In zs_create_pool(), prev_class is assigned (ZS_SIZE_CLASSES - 1) >> times. And the prev_class only references to the previous alloc >> size_class. So we do not need unnecessary assignement. >> >> This patch modifies *prev_class* to *prev_alloc_class*. And the >> *prev_alloc_class* will only be assigned when a new size_class >> structure is allocated. >> >> Signed-off-by: Mahendran Ganesh >> --- >> mm/zsmalloc.c | 9 +++++---- >> 1 file changed, 5 insertions(+), 4 deletions(-) >> >> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c >> index b3b57ef..ac2b396 100644 >> --- a/mm/zsmalloc.c >> +++ b/mm/zsmalloc.c >> @@ -970,7 +970,7 @@ struct zs_pool *zs_create_pool(gfp_t flags) >> int size; >> int pages_per_zspage; >> struct size_class *class; >> - struct size_class *prev_class; >> + struct size_class *uninitialized_var(prev_alloc_class); > > https://lkml.org/lkml/2012/10/27/71 > In addition, I prefer prev_class. Thanks for you review. I will resend the patch. > > Thanks. > > -- > Kind regards, > Minchan Kim -- 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