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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E814C433EF for ; Tue, 10 May 2022 15:50:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240273AbiEJPyg (ORCPT ); Tue, 10 May 2022 11:54:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60434 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346775AbiEJPvZ (ORCPT ); Tue, 10 May 2022 11:51:25 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32DDC15730; Tue, 10 May 2022 08:45:55 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id BF2C6614A1; Tue, 10 May 2022 15:45:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 442E7C385C2; Tue, 10 May 2022 15:45:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1652197554; bh=sAbBE4ZK/Gtrs3Du8M9bUK9bxR4OSTLCtTqbA3WnEw8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aFZHo18fHP0l3PChKgAzktsYtN0bTbxjaym5ikHwMywd4F6BpMx1UA1+ek3e1lLmX EJJe5R/8WQ3Ur2W+adt3KalUp4NqyVC+VDzufDXkK11v4eh1bCUaveALRFLGJV8jpJ nlq2rHAhN19Mt5OSYVEW1TKmiMd8jSNke82i/PE1LrP3J/3V+40cBslJClR36XKiVl RSK1hEyeMBK08hq9oad8EklI4v957Tr4WPLxV4OYj9yBFR2lrUET4dJhckR0HsyL9r vSU4a6ux5Pu9XjWEbiPtsD77Xv3tl6xQyv/pawk6h+e+VfCKSNIhD/ZCShPTqijOuC KLwArm40lFEFQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sven Schnelle , Heiko Carstens , Sasha Levin , gor@linux.ibm.com, agordeev@linux.ibm.com, linux-s390@vger.kernel.org Subject: [PATCH AUTOSEL 5.4 5/8] s390: disable -Warray-bounds Date: Tue, 10 May 2022 11:45:33 -0400 Message-Id: <20220510154536.154070-5-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220510154536.154070-1-sashal@kernel.org> References: <20220510154536.154070-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sven Schnelle [ Upstream commit 8b202ee218395319aec1ef44f72043e1fbaccdd6 ] gcc-12 shows a lot of array bound warnings on s390. This is caused by the S390_lowcore macro which uses a hardcoded address of 0. Wrapping that with absolute_pointer() works, but gcc no longer knows that a 12 bit displacement is sufficient to access lowcore. So it emits instructions like 'lghi %r1,0; l %rx,xxx(%r1)' instead of a single load/store instruction. As s390 stores variables often read/written in lowcore, this is considered problematic. Therefore disable -Warray-bounds on s390 for gcc-12 for the time being, until there is a better solution. Signed-off-by: Sven Schnelle Link: https://lore.kernel.org/r/yt9dzgkelelc.fsf@linux.ibm.com Link: https://lore.kernel.org/r/20220422134308.1613610-1-svens@linux.ibm.com Link: https://lore.kernel.org/r/20220425121742.3222133-1-svens@linux.ibm.com Signed-off-by: Heiko Carstens Signed-off-by: Sasha Levin --- arch/s390/Makefile | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/s390/Makefile b/arch/s390/Makefile index 2faaf456956a..71e3d7c0b870 100644 --- a/arch/s390/Makefile +++ b/arch/s390/Makefile @@ -31,6 +31,16 @@ KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-option,-ffreestanding) KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, address-of-packed-member) KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO),-g) KBUILD_CFLAGS_DECOMPRESSOR += $(if $(CONFIG_DEBUG_INFO_DWARF4), $(call cc-option, -gdwarf-4,)) + +ifdef CONFIG_CC_IS_GCC + ifeq ($(call cc-ifversion, -ge, 1200, y), y) + ifeq ($(call cc-ifversion, -lt, 1300, y), y) + KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) + KBUILD_CFLAGS_DECOMPRESSOR += $(call cc-disable-warning, array-bounds) + endif + endif +endif + UTS_MACHINE := s390x STACK_SIZE := $(if $(CONFIG_KASAN),65536,16384) CHECKFLAGS += -D__s390__ -D__s390x__ -- 2.35.1