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 X-Spam-Level: X-Spam-Status: No, score=-14.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 0BA3AC432C0 for ; Tue, 19 Nov 2019 04:57:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D47D02231D for ; Tue, 19 Nov 2019 04:57:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="odrJnbLA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727145AbfKSE5U (ORCPT ); Mon, 18 Nov 2019 23:57:20 -0500 Received: from mail-ot1-f65.google.com ([209.85.210.65]:41753 "EHLO mail-ot1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727097AbfKSE5T (ORCPT ); Mon, 18 Nov 2019 23:57:19 -0500 Received: by mail-ot1-f65.google.com with SMTP id 94so16725222oty.8; Mon, 18 Nov 2019 20:57:19 -0800 (PST) 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=0BfAG347llFRLd3tFIx1Ke7J/fonGQZbEZDA3VvZY+U=; b=odrJnbLAQ+lW8dC5pbNDgv4E5e5dOChAG3k/NKL11OtONbwKb18OmogkgowYaoNreY /nTmfn66HhS81ckhyMXroeZ7VZAd78gvYQcujp7csy8DeQZLGyVl6axC2Ya/cVeEYwhZ LBWLBm83HxtutrXCkFe4ONuEJTxJyczM/eRNFJw2EC/SDa49L2jtHadlz75D5PPcGWnI iwOrFq6hxfZgMufhny/94XaoBwmh9eiP1o1G725lHpVnNbFPjPL7ELLZlAr53EUI0f7w 7TQbdHfJ86cHqKkSoHKrHf6Dv9ddOTezxJ9/Rre4G9IbkREOsr6MPfuCIZQw3BFbAXu6 t5qQ== 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=0BfAG347llFRLd3tFIx1Ke7J/fonGQZbEZDA3VvZY+U=; b=RSRuAwmyxBYRA8NveAlqlurT6IXueEMwF31SrlKlbCtydDwHcLjpvrYZvCyFuxDSEM 9wgvXKBzGKwnW2ZsyoDMxI/TY3BRRSdyjyWeSw8rJRx4SNJlxs8lwzPqix4AfEXnIlsi G1YvvcxLX6/5ICo1tSrCiOWRxs9N1sf0OSBlxGk0XA55oIHjXXnDDlbqkiEv7kfl196a CK8sy0K6LXU2a0znP7QZvJ9JP85bkJl2vn2L54JK/uCA+3aHeSd5sELztgCcUqOmScns mZppEWplXqbYhrVecNZbGWwVU6PIfSTd7/EWD67uSbtdQjk4YCOCEqPWHIdN3eu/myK3 DPuw== X-Gm-Message-State: APjAAAXe/NcZTesjd3nPRzeMbKekIbfgviZrB0sbB9+7DGK0uExFVx76 2zq6d9jVZNcQadoBkcHtoFM= X-Google-Smtp-Source: APXvYqymsvgrUhQmsQWi69cCe7+4yyiO+K/A7AyiJt/nSKg06hd83Nm3RGBTIb7mwxwlkdDzUCcFiQ== X-Received: by 2002:a05:6830:2157:: with SMTP id r23mr1433047otd.343.1574139438568; Mon, 18 Nov 2019 20:57:18 -0800 (PST) Received: from localhost.localdomain ([2604:1380:4111:8b00::7]) by smtp.gmail.com with ESMTPSA id e88sm7019765ote.39.2019.11.18.20.57.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Nov 2019 20:57:18 -0800 (PST) From: Nathan Chancellor To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Nick Desaulniers , Nathan Chancellor , stable@vger.kernel.org, Segher Boessenkool Subject: [PATCH v5 2/3] powerpc: Avoid clang warnings around setjmp and longjmp Date: Mon, 18 Nov 2019 21:57:11 -0700 Message-Id: <20191119045712.39633-3-natechancellor@gmail.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191119045712.39633-1-natechancellor@gmail.com> References: <20191014025101.18567-1-natechancellor@gmail.com> <20191119045712.39633-1-natechancellor@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Commit aea447141c7e ("powerpc: Disable -Wbuiltin-requires-header when setjmp is used") disabled -Wbuiltin-requires-header because of a warning about the setjmp and longjmp declarations. r367387 in clang added another diagnostic around this, complaining that there is no jmp_buf declaration. In file included from ../arch/powerpc/xmon/xmon.c:47: ../arch/powerpc/include/asm/setjmp.h:10:13: error: declaration of built-in function 'setjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header . [-Werror,-Wincomplete-setjmp-declaration] extern long setjmp(long *); ^ ../arch/powerpc/include/asm/setjmp.h:11:13: error: declaration of built-in function 'longjmp' requires the declaration of the 'jmp_buf' type, commonly provided in the header . [-Werror,-Wincomplete-setjmp-declaration] extern void longjmp(long *, long); ^ 2 errors generated. We are not using the standard library's longjmp/setjmp implementations for obvious reasons; make this clear to clang by using -ffreestanding on these files. Cc: stable@vger.kernel.org # 4.14+ Link: https://github.com/ClangBuiltLinux/linux/issues/625 Link: https://github.com/llvm/llvm-project/commit/3be25e79477db2d31ac46493d97eca8c20592b07 Link: https://godbolt.org/z/B2oQnl Suggested-by: Segher Boessenkool Reviewed-by: Nick Desaulniers Signed-off-by: Nathan Chancellor --- v1 -> v3 (I skipped v2 because the first patch in the series already had a v2): * Use -ffreestanding instead of outright disabling the warning because it is legitimate. v3 -> v4: * Rebase on v5.4-rc3 * Add Nick's reviewed-by and Compiler Explorer link. v4 -> v5: * Rebase on next-20191118 arch/powerpc/kernel/Makefile | 4 ++-- arch/powerpc/xmon/Makefile | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index bb57d168d6f4..3c113ae0de2b 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -5,8 +5,8 @@ CFLAGS_ptrace.o += -DUTS_MACHINE='"$(UTS_MACHINE)"' -# Disable clang warning for using setjmp without setjmp.h header -CFLAGS_crash.o += $(call cc-disable-warning, builtin-requires-header) +# Avoid clang warnings around longjmp/setjmp declarations +CFLAGS_crash.o += -ffreestanding ifdef CONFIG_PPC64 CFLAGS_prom_init.o += $(NO_MINIMAL_TOC) diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile index f142570ad860..c3842dbeb1b7 100644 --- a/arch/powerpc/xmon/Makefile +++ b/arch/powerpc/xmon/Makefile @@ -1,8 +1,8 @@ # SPDX-License-Identifier: GPL-2.0 # Makefile for xmon -# Disable clang warning for using setjmp without setjmp.h header -subdir-ccflags-y := $(call cc-disable-warning, builtin-requires-header) +# Avoid clang warnings around longjmp/setjmp declarations +subdir-ccflags-y := -ffreestanding GCOV_PROFILE := n KCOV_INSTRUMENT := n -- 2.24.0