From patchwork Wed Apr 1 16:17:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 228333 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A407C43331 for ; Wed, 1 Apr 2020 16:52:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 35B2C20714 for ; Wed, 1 Apr 2020 16:52:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585759952; bh=y93Yqnkx4Hl3ZA0sTp1vcKVcdEB/pEvRT2wpcf1fUPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=JOwtXVKZDVtmGdpng3G0ngEpadMzfN7yEutbT/nLnMdAB+9S5usytNyAXSrI+33HW o2LZOn0vHtwJOa7Y0Tw8KjiSopmAJkwTwh9bg8HvztPq8WbABT720zEazNsv+u2DYx w5/QbGGuU9TB9hCrKxnRioKCXXqiwxsAj+fJvDUM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733025AbgDAQgB (ORCPT ); Wed, 1 Apr 2020 12:36:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:34838 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388557AbgDAQgA (ORCPT ); Wed, 1 Apr 2020 12:36:00 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 2977120BED; Wed, 1 Apr 2020 16:35:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585758959; bh=y93Yqnkx4Hl3ZA0sTp1vcKVcdEB/pEvRT2wpcf1fUPk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lf6Q6a708oqWAE/ywEjYDyDsHCJ6nqWAzWL5UzlxK+OUZPb3cWQjOQYb7zrALTAj9 T9Ve/Wow9va2e6wCxZRPJo+wRTJoyaMWyyqBgsKvMXuJmLWZdH49h83+CwupVUF+cX whBbrBp7hxXnzrnRE4YXVM9l3UvMbJZZGUopXeXQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nathan Chancellor , Masahiro Yamada , Sasha Levin Subject: [PATCH 4.9 030/102] kbuild: Disable -Wpointer-to-enum-cast Date: Wed, 1 Apr 2020 18:17:33 +0200 Message-Id: <20200401161538.731202411@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200401161530.451355388@linuxfoundation.org> References: <20200401161530.451355388@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nathan Chancellor commit 82f2bc2fcc0160d6f82dd1ac64518ae0a4dd183f upstream. Clang's -Wpointer-to-int-cast deviates from GCC in that it warns when casting to enums. The kernel does this in certain places, such as device tree matches to set the version of the device being used, which allows the kernel to avoid using a gigantic union. https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L428 https://elixir.bootlin.com/linux/v5.5.8/source/drivers/ata/ahci_brcm.c#L402 https://elixir.bootlin.com/linux/v5.5.8/source/include/linux/mod_devicetable.h#L264 To avoid a ton of false positive warnings, disable this particular part of the warning, which has been split off into a separate diagnostic so that the entire warning does not need to be turned off for clang. It will be visible under W=1 in case people want to go about fixing these easily and enabling the warning treewide. Cc: stable@vger.kernel.org Link: https://github.com/ClangBuiltLinux/linux/issues/887 Link: https://github.com/llvm/llvm-project/commit/2a41b31fcdfcb67ab7038fc2ffb606fd50b83a84 Signed-off-by: Nathan Chancellor Signed-off-by: Masahiro Yamada Signed-off-by: Sasha Levin --- scripts/Makefile.extrawarn | 1 + 1 file changed, 1 insertion(+) diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn index d08b6fbdfa853..1532038f60055 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -70,5 +70,6 @@ KBUILD_CFLAGS += $(call cc-disable-warning, format) KBUILD_CFLAGS += $(call cc-disable-warning, sign-compare) KBUILD_CFLAGS += $(call cc-disable-warning, format-zero-length) KBUILD_CFLAGS += $(call cc-disable-warning, uninitialized) +KBUILD_CFLAGS += $(call cc-disable-warning, pointer-to-enum-cast) endif endif