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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 83A87CD37B0 for ; Mon, 18 Sep 2023 14:51:21 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qiFXU-0007jM-1I; Mon, 18 Sep 2023 10:47:53 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qiFXM-0007bF-Vt for qemu-devel@nongnu.org; Mon, 18 Sep 2023 10:47:46 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qiFXL-0003oy-Aa for qemu-devel@nongnu.org; Mon, 18 Sep 2023 10:47:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1695048460; 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: in-reply-to:in-reply-to:references:references; bh=Rr10BgvxSqJ2B7JFeQPeJKV1bmS3WBpXTQ2eSz0GfVQ=; b=fv5/wG4TvhqmLkjr3lRzYe9mmyesNHTHW+T24NjE9cbd1HUHLR2Oz8KUM9+N7pbwTMP+wy yK9N/KSJDiwD63Yqb/9J7zkKc8+TBprk1F56U4rkMbYG9NVP2LrqfXui3RBVXXOdkYWZC5 TKkz8ecVB7O9gkRhWCsWxovtXcjpakE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-694-ZNSI5qm6NxGEWYqOK2iQsg-1; Mon, 18 Sep 2023 10:47:37 -0400 X-MC-Unique: ZNSI5qm6NxGEWYqOK2iQsg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BBD30101A53B; Mon, 18 Sep 2023 14:47:36 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.127]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D456A1C554; Mon, 18 Sep 2023 14:47:35 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id E818F21E6900; Mon, 18 Sep 2023 16:47:34 +0200 (CEST) From: Markus Armbruster To: Kevin Wolf Cc: qemu-devel@nongnu.org, hreitz@redhat.com, eblake@redhat.com, vsementsov@yandex-team.ru, jsnow@redhat.com, idryomov@gmail.com, pl@kamp.de, sw@weilnetz.de, sstabellini@kernel.org, anthony.perard@citrix.com, paul@xen.org, pbonzini@redhat.com, marcandre.lureau@redhat.com, berrange@redhat.com, thuth@redhat.com, philmd@linaro.org, stefanha@redhat.com, fam@euphon.net, quintela@redhat.com, peterx@redhat.com, leobras@redhat.com, kraxel@redhat.com, qemu-block@nongnu.org, xen-devel@lists.xenproject.org, alex.bennee@linaro.org, peter.maydell@linaro.org Subject: Re: [PATCH 5/7] block/vdi: Clean up local variable shadowing References: <20230831132546.3525721-1-armbru@redhat.com> <20230831132546.3525721-6-armbru@redhat.com> Date: Mon, 18 Sep 2023 16:47:34 +0200 In-Reply-To: (Kevin Wolf's message of "Fri, 15 Sep 2023 09:41:39 +0200") Message-ID: <871qevczcp.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Kevin Wolf writes: > Am 31.08.2023 um 15:25 hat Markus Armbruster geschrieben: >> Local variables shadowing other local variables or parameters make the >> code needlessly hard to understand. Tracked down with -Wshadow=local. >> Clean up: delete inner declarations when they are actually redundant, >> else rename variables. >> >> Signed-off-by: Markus Armbruster > >> @@ -700,7 +699,7 @@ nonallocating_write: >> /* One or more new blocks were allocated. */ >> VdiHeader *header; >> uint8_t *base; >> - uint64_t offset; >> + uint64_t offs; >> uint32_t n_sectors; >> >> g_free(block); >> @@ -723,11 +722,11 @@ nonallocating_write: >> bmap_first /= (SECTOR_SIZE / sizeof(uint32_t)); >> bmap_last /= (SECTOR_SIZE / sizeof(uint32_t)); >> n_sectors = bmap_last - bmap_first + 1; >> - offset = s->bmap_sector + bmap_first; >> + offs = s->bmap_sector + bmap_first; >> base = ((uint8_t *)&s->bmap[0]) + bmap_first * SECTOR_SIZE; >> logout("will write %u block map sectors starting from entry %u\n", >> n_sectors, bmap_first); >> - ret = bdrv_co_pwrite(bs->file, offset * SECTOR_SIZE, >> + ret = bdrv_co_pwrite(bs->file, offs * SECTOR_SIZE, >> n_sectors * SECTOR_SIZE, base, 0); >> } > > Having two variables 'offset' and 'offs' doesn't really help with > clarity either. Can we be more specific and use something like > 'bmap_offset' here? Sure!