From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D3791C433EF for ; Tue, 24 May 2022 23:12:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242525AbiEXXMw (ORCPT ); Tue, 24 May 2022 19:12:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239226AbiEXXMt (ORCPT ); Tue, 24 May 2022 19:12:49 -0400 Received: from out1.migadu.com (out1.migadu.com [IPv6:2001:41d0:2:863f::]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5ED785BE49 for ; Tue, 24 May 2022 16:12:48 -0700 (PDT) Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1653433965; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mk7xRNKNX0AOjCU5G7KogWbcujD8+WpYXrtI2ETV4XE=; b=jbyXtlbZqNLrbFY1S2vnVXbfwQVr7DceO1EXyKdR6qAsHKO5XsshFKzXtd3RxBrN866jNM yQBnKE2abWf1OfF+EvaXxqIq1sNo05pgot/iYufWGjiRK/GBOJy0xPePZYOgo8uUXrdYeN m1yUzychkjRXcWo7joeT7mC8/u+Op6c= Date: Wed, 25 May 2022 02:12:44 +0300 MIME-Version: 1.0 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: vasily.averin@linux.dev Subject: Re: [PATCH] ipc: Remove dead code in perform_atomic_semop() Content-Language: en-US To: Gautam Menghani , akpm@linux-foundation.org, shakeelb@google.com, mhocko@suse.com, manfred@colorfullife.com Cc: linux-kernel@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org, skhan@linuxfoundation.org References: <20220524182244.42987-1-gautammenghani201@gmail.com> In-Reply-To: <20220524182244.42987-1-gautammenghani201@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/24/22 21:22, Gautam Menghani wrote: > Remove the line which is dead code. Fixes the clang scan warning: > warning: Value stored to 'result' is never read [deadcode.DeadStores] > result = curr->semval; > > Signed-off-by: Gautam Menghani > --- > ipc/sem.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/ipc/sem.c b/ipc/sem.c > index 0dbdb98fdf2d..156824bcda47 100644 > --- a/ipc/sem.c > +++ b/ipc/sem.c > @@ -766,7 +766,6 @@ static int perform_atomic_semop(struct sem_array *sma, struct sem_queue *q) > for (sop = sops; sop < sops + nsops; sop++) { > curr = &sma->sems[sop->sem_num]; > sem_op = sop->sem_op; > - result = curr->semval; > > if (sop->sem_flg & SEM_UNDO) { > int undo = un->semadj[sop->sem_num] - sem_op; Perhaps it would be better to keep the "result" but use it in the marked line below, like it was done in previous part of this function? un->semadj[sop->sem_num] = undo; } curr->semval += sem_op; <<<<<< VvS: here ? ipc_update_pid(&curr->sempid, q->pid); Thank you, Vasily Averin