From patchwork Wed Jul 5 18:16:04 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 9826921 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1944D60237 for ; Wed, 5 Jul 2017 18:16:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 129E326223 for ; Wed, 5 Jul 2017 18:16:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 044632853F; Wed, 5 Jul 2017 18:16:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.4 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RCVD_IN_SORBS_SPAM autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7C4B226223 for ; Wed, 5 Jul 2017 18:16:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752018AbdGESQI (ORCPT ); Wed, 5 Jul 2017 14:16:08 -0400 Received: from gateway34.websitewelcome.com ([192.185.148.119]:26423 "EHLO gateway34.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751692AbdGESQH (ORCPT ); Wed, 5 Jul 2017 14:16:07 -0400 Received: from cm12.websitewelcome.com (cm12.websitewelcome.com [100.42.49.8]) by gateway34.websitewelcome.com (Postfix) with ESMTP id EFFD515ADFB for ; Wed, 5 Jul 2017 13:16:04 -0500 (CDT) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id SopndUmBP4kxmSopndcjWT; Wed, 05 Jul 2017 13:15:31 -0500 Received: from [189.152.164.199] (port=59628 helo=embeddedgus) by gator4166.hostgator.com with esmtpa (Exim 4.87) (envelope-from ) id 1dSoqK-004N96-Ou; Wed, 05 Jul 2017 13:16:04 -0500 Date: Wed, 5 Jul 2017 13:16:04 -0500 From: "Gustavo A. R. Silva" To: Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH] sir_ir: remove unnecessary static in sir_interrupt() Message-ID: <20170705181604.GA11956@embeddedgus> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.23 (2014-03-12) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 189.152.164.199 X-Exim-ID: 1dSoqK-004N96-Ou X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedgus) [189.152.164.199]:59628 X-Source-Auth: garsilva@embeddedor.com X-Email-Count: 7 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Remove unnecessary static on local variable delt. Such variable is initialized before being used, on every execution path throughout the function. The static has no benefit and, removing it reduces the code size. This issue was detected using Coccinelle and the following semantic patch: @bad exists@ position p; identifier x; type T; @@ static T x@p; ... x = <+...x...+> @@ identifier x; expression e; type T; position p != bad.p; @@ -static T x@p; ... when != x when strict ?x = e; In the following log you can see the difference in the code size. Also, there is a significant difference in the bss segment. This log is the output of the size command, before and after the code change: before: text data bss dec hex filename 5009 3456 576 9041 2351 drivers/media/rc/sir_ir.o after: text data bss dec hex filename 4988 3400 512 8900 22c4 drivers/media/rc/sir_ir.o Signed-off-by: Gustavo A. R. Silva --- drivers/media/rc/sir_ir.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/rc/sir_ir.c b/drivers/media/rc/sir_ir.c index 20234ba..be67f7c 100644 --- a/drivers/media/rc/sir_ir.c +++ b/drivers/media/rc/sir_ir.c @@ -155,7 +155,7 @@ static irqreturn_t sir_interrupt(int irq, void *dev_id) { unsigned char data; ktime_t curr_time; - static unsigned long delt; + unsigned long delt; unsigned long deltintr; unsigned long flags; int counter = 0;