From patchwork Wed Oct 24 04:03:52 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Leonardo_Br=C3=A1s?= X-Patchwork-Id: 10654143 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A0A6A13BF for ; Wed, 24 Oct 2018 04:04:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9323D29DB8 for ; Wed, 24 Oct 2018 04:04:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8782329DC8; Wed, 24 Oct 2018 04:04:21 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI 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 2973329DB8 for ; Wed, 24 Oct 2018 04:04:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726863AbeJXMaf (ORCPT ); Wed, 24 Oct 2018 08:30:35 -0400 Received: from mail-qk1-f196.google.com ([209.85.222.196]:41772 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726449AbeJXMaf (ORCPT ); Wed, 24 Oct 2018 08:30:35 -0400 Received: by mail-qk1-f196.google.com with SMTP id g13-v6so2322438qke.8; Tue, 23 Oct 2018 21:04:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5D1hZGQn79sjYuJIciSxWCUSa1H94oaAOohqbOYmnPw=; b=rk2/LpXUFkJOz5u8T5qtI3WGt7M0UqyEdeCO6AqwqA2l9OgE6D/qMPvqXT5ygU6ovC EQIPoDQQId/5ttOA2mB2SHH6/wUh8JGL5wHxQjSWnLNXbTC3rbmsXSvMn0AHTvA+2D4v PyuyANFcglMLRu2xVe4/eAxUT8q3LuBpkC0xSjDnJe+YNU0YOhXVDrLlSOF6/pmCXw4U 5CX4OCZcaOrlP3gagcPO5Dji7IAOH4Wibgvkngl1riFZ70VrEwqA2HfETDC9ZNz2yKF0 59MPNrPT6zV0NO+aaRZbFf2H0gLdHyCi3pgwBRGQIyNXx09pshyF0ZOwbiG1ATCcm62N RK/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=5D1hZGQn79sjYuJIciSxWCUSa1H94oaAOohqbOYmnPw=; b=jJQLe6srftnqp5ERDSqvbyFfhqoHHyXNcsTgiUwg5xoo3ewj9NQcgFctb00Lxj1H3S 4AwHEc4RytySo47B0TfiF2IpOgj7F4PEGC+G5ZQ3NPrO9xtGE7UyCX0zEkKqgaxmx4Wl KN6AG+YwEOXPRTzvGM7AK9NO5jSbzw+ZfO54ed+93adnaFrAqyLMfQQ9Rk7JNKKXI295 uWVRFmv3IYR/gEJe9PiICMmBYjxJeFhMB///p6hDAhc1PmGa1WK0fjOmpsN8NGkDeeL2 5xInC1/nl7uqA0IorDNFyjenyrLG9PSsOuqEXRKzAdOUr5QONphBiatc9Qo+UvOloWoW UeSQ== X-Gm-Message-State: AGRZ1gI3xg+1JirhSoEQOPiCHlLn3Sq+egTkjVby2nbC7MAUBZX7y3Jr dhrkLQ6Q8bhES0sFH+gnd88= X-Google-Smtp-Source: AJdET5dtzI20RY5+5wDbK6LXaPfnMfyJRanYbTIip+/rOfOukxeBUq+TzGueS0GxbbrLoxdQ3ZupUA== X-Received: by 2002:ae9:e313:: with SMTP id v19-v6mr856863qkf.318.1540353856686; Tue, 23 Oct 2018 21:04:16 -0700 (PDT) Received: from localhost.localdomain ([179.159.21.48]) by smtp.gmail.com with ESMTPSA id e195-v6sm3229126qka.2.2018.10.23.21.04.11 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 23 Oct 2018 21:04:16 -0700 (PDT) From: Leonardo Bras To: lkcamp@lists.libreplanetbr.org Cc: Leonardo Bras , Borislav Petkov , David.Laight@aculab.com, Andy Lutomirski , Ingo Molnar , helen@koikeco.de, Masahiro Yamada , Michal Marek , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 3/5] Creates macro to avoid variable shadowing Date: Wed, 24 Oct 2018 01:03:52 -0300 Message-Id: <20181024040354.24879-4-leobras.c@gmail.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181024040354.24879-1-leobras.c@gmail.com> References: <20181024040354.24879-1-leobras.c@gmail.com> MIME-Version: 1.0 Sender: linux-kbuild-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Creates DEF_FIELD_ADDR_VAR as a more generic version of the DEF_FIELD_ADD macro, allowing usage of a variable name other than the struct element name. Also, sets DEF_FIELD_ADDR as a specific usage of DEF_FILD_ADDR_VAR in which the var name is the same as the struct element name. Then, makes use of DEF_FIELD_ADDR_VAR to create a variable of another name, in order to avoid variable shadowing. Signed-off-by: Leonardo Bras --- scripts/mod/file2alias.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c index 7be43697ff84..ed468313ddeb 100644 --- a/scripts/mod/file2alias.c +++ b/scripts/mod/file2alias.c @@ -95,12 +95,20 @@ extern struct devtable *__start___devtable[], *__stop___devtable[]; */ #define DEF_FIELD(m, devid, f) \ typeof(((struct devid *)0)->f) f = TO_NATIVE(*(typeof(f) *)((m) + OFF_##devid##_##f)) + +/* Define a variable v that holds the address of field f of struct devid + * based at address m. Due to the way typeof works, for a field of type + * T[N] the variable has type T(*)[N], _not_ T*. + */ +#define DEF_FIELD_ADDR_VAR(m, devid, f, v) \ + typeof(((struct devid *)0)->f) *v = ((m) + OFF_##devid##_##f) + /* Define a variable f that holds the address of field f of struct devid * based at address m. Due to the way typeof works, for a field of type * T[N] the variable has type T(*)[N], _not_ T*. */ #define DEF_FIELD_ADDR(m, devid, f) \ - typeof(((struct devid *)0)->f) *f = ((m) + OFF_##devid##_##f) + DEF_FIELD_ADDR_VAR(m, devid, f, f) /* Add a table entry. We test function type matches while we're here. */ #define ADD_TO_DEVTABLE(device_id, type, function) \ @@ -644,7 +652,7 @@ static void do_pnp_card_entries(void *symval, unsigned long size, for (i = 0; i < count; i++) { unsigned int j; - DEF_FIELD_ADDR(symval + i*id_size, pnp_card_device_id, devs); + DEF_FIELD_ADDR(symval + i * id_size, pnp_card_device_id, devs); for (j = 0; j < PNP_MAX_DEVICES; j++) { const char *id = (char *)(*devs)[j].id; @@ -656,10 +664,13 @@ static void do_pnp_card_entries(void *symval, unsigned long size, /* find duplicate, already added value */ for (i2 = 0; i2 < i && !dup; i2++) { - DEF_FIELD_ADDR(symval + i2*id_size, pnp_card_device_id, devs); + DEF_FIELD_ADDR_VAR(symval + i2 * id_size, + pnp_card_device_id, + devs, devs_dup); for (j2 = 0; j2 < PNP_MAX_DEVICES; j2++) { - const char *id2 = (char *)(*devs)[j2].id; + const char *id2 = + (char *)(*devs_dup)[j2].id; if (!id2[0]) break;