Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751680AbdHAIAB (ORCPT ); Tue, 1 Aug 2017 04:00:01 -0400 Received: from mail-it0-f47.google.com ([209.85.214.47]:33012 "EHLO mail-it0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750763AbdHAH77 (ORCPT ); Tue, 1 Aug 2017 03:59:59 -0400 MIME-Version: 1.0 In-Reply-To: <20170711213519.GA3391@embeddedgus> References: <20170711213519.GA3391@embeddedgus> From: Linus Walleij Date: Tue, 1 Aug 2017 09:59:58 +0200 Message-ID: Subject: Re: [PATCH] pinctrl: coh901: constify gpio_chip structure To: "Gustavo A. R. Silva" Cc: "linux-gpio@vger.kernel.org" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1228 Lines: 53 On Tue, Jul 11, 2017 at 11:35 PM, Gustavo A. R. Silva wrote: > This structure is only used to copy into another structure, so declare > it as const. > > This issue was detected using Coccinelle and the following semantic patch: > > @r disable optional_qualifier@ > identifier i; > position p; > @@ > static struct gpio_chip i@p = { ... }; > > @ok@ > identifier r.i; > expression e; > position p; > @@ > e = i@p; > > @bad@ > position p != {r.p,ok.p}; > identifier r.i; > struct gpio_chip e; > @@ > e@i@p > > @depends on !bad disable optional_qualifier@ > identifier r.i; > @@ > static > +const > struct gpio_chip i = { ... }; > > In the following log you can see a significant difference in the code size > and data segment, hence in the dec segment. This log is the output > of the size command, before and after the code change: > > before: > text data bss dec hex filename > 12775 3696 64 16535 4097 drivers/pinctrl/pinctrl-coh901.o > > after: > bss dec hex filename > 12440 3640 64 16144 3f10 drivers/pinctrl/pinctrl-coh901.o > > Signed-off-by: Gustavo A. R. Silva Patch applied. Yours, Linus Walleij