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 6A213C433FE for ; Wed, 26 Oct 2022 12:01:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233532AbiJZMBM (ORCPT ); Wed, 26 Oct 2022 08:01:12 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34302 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233416AbiJZMBI (ORCPT ); Wed, 26 Oct 2022 08:01:08 -0400 Received: from mail-ed1-x533.google.com (mail-ed1-x533.google.com [IPv6:2a00:1450:4864:20::533]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1EAEF62900; Wed, 26 Oct 2022 05:01:07 -0700 (PDT) Received: by mail-ed1-x533.google.com with SMTP id a5so27941011edb.11; Wed, 26 Oct 2022 05:01:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from:from:to :cc:subject:date:message-id:reply-to; bh=eCtqGBwRR52BjUb2Wh7FLafniFKggPInKgSqsTGAvt0=; b=leGA4qoyrfWu79SeDDY1Fpo34CYPzzjLv68Ja1abwz+SMwx1nPmuvDTz1TDqpIatxk 3RpcqHN5wUmk14raenigd1/dCfWPgu02Mcro/BOa/EDedD2UJcYRcE+GxYpGyva10ZwX JODRghr9tCLi8eWJawFMZ7+PIS19+3gyxhbPzNi+qQX3XkZboKHABroQ0h7Qiwm55U3L H5gHn2nXTessOqFZxDrZ5TQYYscZBkEp15vI3ZXC3aNaS00JRD5aZrILQhUOY9WlR/0Z uSR0ZIra0x4coQA9R/cBeF1uiGWGH2QlKD1/ULE44TBzkuK6u6EmR98B7xbmkYgSmmOG J9xg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=references:in-reply-to:message-id:date:subject:cc:to:from :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=eCtqGBwRR52BjUb2Wh7FLafniFKggPInKgSqsTGAvt0=; b=dqRp6DIv114GciQxcmjftXDvwzd5JXQt+0582PPeG2Ef+VgagT5WgxoPpjaW5HqayL U6iLrTkDXnJTGSHxswOGfxfqJMBPq2maUNM6QJUNGeYxoRrTWNPa+cWCT/E7+9NBdZby 6RcRizrzYSAzL6k6unbihvQ9IZtkkXXQOM1f2LljJ5dVtD6wUuG1fvQqK/ztyUHz9l93 +48Xzbop1YURKC9vfmlexcnWwSXmzSW/CfMDdy+NlahaeN6Qeg96VQ7qCzOk8kuuOaO5 gjG07BmLK2uBBAxhowASdrpVS4eBw7X1Fri4qywGUmkxNkimajrXtl/2k1eIqhbk5YoN jRZg== X-Gm-Message-State: ACrzQf0MZJs9bQ6fMUrXuifiVgse5mw7/xyY0LQ28ITmCjsfwGfBw6kQ 3iT2ktSWYdtHNBlnZ3IA/Is= X-Google-Smtp-Source: AMsMyM4S2WOpYB7baEE7G/A5nEFun1gaZ1VPWURaDzAg4GG41p/l6TvGEF3Y7ZSEwi5jJcOhKde5/w== X-Received: by 2002:a05:6402:11ce:b0:45c:a364:2c3d with SMTP id j14-20020a05640211ce00b0045ca3642c3dmr41106701edw.204.1666785665669; Wed, 26 Oct 2022 05:01:05 -0700 (PDT) Received: from felia.fritz.box (200116b826195000091b3ab8e8f9a156.dip.versatel-1u1.de. [2001:16b8:2619:5000:91b:3ab8:e8f9:a156]) by smtp.gmail.com with ESMTPSA id ky21-20020a170907779500b00788c622fa2csm2872760ejc.135.2022.10.26.05.01.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Oct 2022 05:01:04 -0700 (PDT) From: Lukas Bulwahn To: "Liam R . Howlett" , Matthew Wilcox , Andrew Morton , linux-mm@kvack.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org, Lukas Bulwahn Subject: [PATCH 1/1] lib: maple_tree: remove unneeded initialization in mtree_range_walk() Date: Wed, 26 Oct 2022 14:00:29 +0200 Message-Id: <20221026120029.12555-2-lukas.bulwahn@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221026120029.12555-1-lukas.bulwahn@gmail.com> References: <20221026120029.12555-1-lukas.bulwahn@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Before the do-while loop in mtree_range_walk(), the variables next, min, max need to be initialized. The variables last, prev_min and prev_max are set within the loop body before they are eventually used after exiting the loop body. As it is a do-while loop, the loop body is executed at least once, so the variables last, prev_min and prev_max do not need to be initialized before the loop body. Remove unneeded initialization of last and prev_min. The needless initialization was reported by clang-analyzer as Dead Stores. As the compiler already identifies these assignments as unneeded, it optimizes the assignments away. Hence: No functional change. No change in object code. Signed-off-by: Lukas Bulwahn --- lib/maple_tree.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/maple_tree.c b/lib/maple_tree.c index e1743803c851..fbde494444b8 100644 --- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -2903,8 +2903,8 @@ static inline void *mtree_range_walk(struct ma_state *mas) unsigned long max, min; unsigned long prev_max, prev_min; - last = next = mas->node; - prev_min = min = mas->min; + next = mas->node; + min = mas->min; max = mas->max; do { offset = 0; -- 2.17.1