From patchwork Wed Apr 1 16:17:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 228312 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 63498C43331 for ; Wed, 1 Apr 2020 16:54:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2A7DC206E9 for ; Wed, 1 Apr 2020 16:54:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585760046; bh=NAZtYmCrKrUZmtKsMs7hekbghArZfgx6xTus4UqzlRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=oE9zu/Zio131e2MFTa6skzfpZsKVzDMeGdhJ8ARIMHRBRqhDHN8dnP5D2Cmj/3SCJ c+IF4TFhSZaT4tAm3ulPFbnvZvx84J5eeJoYG5ItsKI5anTDr+xzJvxzfrhgP3fSpw v32qekECNQH8gGZ95NywYWQLmfB/5osQ8cA31AA0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733226AbgDAQa3 (ORCPT ); Wed, 1 Apr 2020 12:30:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:56358 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1733156AbgDAQa2 (ORCPT ); Wed, 1 Apr 2020 12:30:28 -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 6F8F72137B; Wed, 1 Apr 2020 16:30:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585758627; bh=NAZtYmCrKrUZmtKsMs7hekbghArZfgx6xTus4UqzlRI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e9LiBT9nSdkfUQAbf5ObQHcYqYud9xbL2nr6DJYrCPjeh3yERqbXUJeTR/yWhfTt9 V5J9bs02j1wOvl1xHTfXoKnvCWBMq3ukFGyvwwVXF29SKyQSXwnRKMx1SSnidlXamM ASCYo6v8PGCC4DT0Lwnro+PJ5WVf9g+0WUyYUWyI= 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 4.4 28/91] kbuild: Disable -Wpointer-to-enum-cast Date: Wed, 1 Apr 2020 18:17:24 +0200 Message-Id: <20200401161523.154654139@linuxfoundation.org> X-Mailer: git-send-email 2.26.0 In-Reply-To: <20200401161512.917494101@linuxfoundation.org> References: <20200401161512.917494101@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 93e23a73b232f..11096b2fa5cb2 100644 --- a/scripts/Makefile.extrawarn +++ b/scripts/Makefile.extrawarn @@ -67,5 +67,6 @@ 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