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 87013C43334 for ; Tue, 28 Jun 2022 02:23:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244159AbiF1CXe (ORCPT ); Mon, 27 Jun 2022 22:23:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243830AbiF1CWE (ORCPT ); Mon, 27 Jun 2022 22:22:04 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 842B124F22; Mon, 27 Jun 2022 19:21:51 -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 21A45617C4; Tue, 28 Jun 2022 02:21:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46590C34115; Tue, 28 Jun 2022 02:21:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1656382910; bh=8+4uDQviuU5h9A+JPcCH1qBlveHGGDKh5+PAXUSyq84=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TtMggk8QZexAFxugwQw62SOiI2HbEoN8OdY6zQu50v9CySM9B6gmH8HtGfp/2re78 yGEgGN7+444cggzYMJlw9e4kLlWxrf+s/yfTLUcjBEpVohiWb66hjCHviaWKMR6629 U/+ep8G1QdHK+SWGwnLX3+0kZBzZlpV5Y38cqrXuBKOxw/4+KrmFtigqBE/MQWJghd fyU9e0hY3hTejsxMN4adBOcoJNyQ5277PylRC1gkUORUKIQYCsBqOkfFzPXHdPOtyL fAOChA1+KI8X0b89bw3Gq2aKJcXyonK4WJuYKxrCXbrYPwwRgL1DhlJcl6F55VQ2j+ Qg2bE6glVfdiA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Christophe Leroy , Michael Ellerman , Sasha Levin , aneesh.kumar@linux.ibm.com, rafael.j.wysocki@intel.com, joel@jms.id.au, adobriyan@gmail.com, Julia.Lawall@inria.fr, jlu.hpw@foxmail.com, nick.child@ibm.com, linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 5.15 18/41] powerpc/prom_init: Fix build failure with GCC_PLUGIN_STRUCTLEAK_BYREF_ALL and KASAN Date: Mon, 27 Jun 2022 22:20:37 -0400 Message-Id: <20220628022100.595243-18-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220628022100.595243-1-sashal@kernel.org> References: <20220628022100.595243-1-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: Christophe Leroy [ Upstream commit ca5dabcff1df6bc8c413922b5fa63cc602858803 ] When CONFIG_KASAN is selected, we expect prom_init to use __memset() because it is too early to use memset(). But with CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL, the compiler adds calls to memset() to clear objects on stack, hence the following failure: PROMCHK arch/powerpc/kernel/prom_init_check Error: External symbol 'memset' referenced from prom_init.c make[2]: *** [arch/powerpc/kernel/Makefile:204 : arch/powerpc/kernel/prom_init_check] Erreur 1 prom_find_machine_type() is called from prom_init() and is called only once, so lets put compat[] in BSS instead of stack to avoid that. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/3802811f7cf94f730be44688539c01bba3a3b5c0.1654875808.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin --- arch/powerpc/kernel/prom_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/prom_init.c b/arch/powerpc/kernel/prom_init.c index f845065c860e..ff685940e272 100644 --- a/arch/powerpc/kernel/prom_init.c +++ b/arch/powerpc/kernel/prom_init.c @@ -2300,7 +2300,7 @@ static void __init prom_init_stdout(void) static int __init prom_find_machine_type(void) { - char compat[256]; + static char compat[256] __prombss; int len, i = 0; #ifdef CONFIG_PPC64 phandle rtas; -- 2.35.1