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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B6182CD1288 for ; Wed, 3 Apr 2024 13:31:08 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20230601 header.b=BHFOsM6+; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4V8ly32whJz77c7 for ; Thu, 4 Apr 2024 00:31:07 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20230601 header.b=BHFOsM6+; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::631; helo=mail-pl1-x631.google.com; envelope-from=groeck7@gmail.com; receiver=lists.ozlabs.org) Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4V8ljP1l35z3w0m for ; Thu, 4 Apr 2024 00:20:09 +1100 (AEDT) Received: by mail-pl1-x631.google.com with SMTP id d9443c01a7336-1e0bfc42783so53742365ad.0 for ; Wed, 03 Apr 2024 06:20:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1712150407; x=1712755207; darn=lists.ozlabs.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:from:to:cc:subject:date :message-id:reply-to; bh=Wn5Y6haDMX+KFeDZiuG3bLreTNkdvF0hb2IVOihuo/Q=; b=BHFOsM6+ZX9nbDNW1H/8G1bUY8NrdK5nxCchpHN08njKrToYoEOWHGG4qgenrxegoT mZKkCK6sxehLVY1W3pP1P3qG9cx54CwLQZ4PRwJU3UgVWjqkLfEg8p+Oh6bY+j87GneH My8+3WhvMcYPb+bV4xkWVl1aeNB8N5KZJ3Dnm+C6AQGu7XbWJtjQu3rQ8SEmHny6IzdB PziGmkiksKi2eGlrMz8RQ9zc3AaBzltaw/wZMp3TNxjHZFo2V1WYYiqxH5kvKQDhZzl6 YlZtUDqnRYvhJ2Jqf0oHsn+ra2s+aEPqP7OSf8jQ17y/KsicXc7FoLlhbfK7qNEJJKSR 3uGQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712150407; x=1712755207; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:sender:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=Wn5Y6haDMX+KFeDZiuG3bLreTNkdvF0hb2IVOihuo/Q=; b=ouGZWNssaWy6bqiF7L72ALTxeFZb2cyNTAvH+k4V1CZNdXKvslU11CpLFHNFvZ0l3S QNfnVvpyKxSihE74PshWfiBQaIDl9I/K3CAf1PZoRNAkwbiriSNVv4XxgRuQVY0frPs/ J5OJTLpv2cVxO0L/D7zNcfSrxlGJZZwhGqmmRXeAIgPwFp2eiZtgekfDcq9ESwyDYM0+ 3HP/zLdJ+WfUwUcErj8emeA29kSyBv+rmoW4e5ekdfMxpDU/UBdUkgHACqb5JdDQlr1o HoU2XSojfClSTkUEArmaRi3cNqlK4RLn81rc1cqhGwzV1qrxlFlhuu0f9kWXBhQRmYPH 2peg== X-Forwarded-Encrypted: i=1; AJvYcCUWVv9XMRntrDlVD33KksCUN+0bOgSrlmxS2j8ghCEAFQ0VXrQMlc9fP8mQHWTtvaSsW2+qC7y1hNX+4N45f2xeWE6+tbgFxe9FeQBeyQ== X-Gm-Message-State: AOJu0Yw6QFh7DYIX5BHd5QNt3sx6Oc4NIx76Od42symURo+OFXmkJrYp YcIPlmN9fXZnDBKvgiLl97YziVJa4eJLwbAVXn9n9mVnLI4N2rRY X-Google-Smtp-Source: AGHT+IHWmvXbtJ9fAm6MAldmvpyAC7gyMYuUNuumU3VUQ5OUfg6iZFWTqXY0l/Y7ponpfkrN4lhaag== X-Received: by 2002:a17:902:e74f:b0:1e0:d630:f054 with SMTP id p15-20020a170902e74f00b001e0d630f054mr18958233plf.7.1712150407580; Wed, 03 Apr 2024 06:20:07 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id k12-20020a170902c40c00b001e0b3a87dbbsm1705074plk.177.2024.04.03.06.20.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Apr 2024 06:20:07 -0700 (PDT) From: Guenter Roeck To: linux-kselftest@vger.kernel.org Subject: [PATCH v3 15/15] powerpc: Add support for suppressing warning backtraces Date: Wed, 3 Apr 2024 06:19:36 -0700 Message-Id: <20240403131936.787234-16-linux@roeck-us.net> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240403131936.787234-1-linux@roeck-us.net> References: <20240403131936.787234-1-linux@roeck-us.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: x86@kernel.org, loongarch@lists.linux.dev, linux-doc@vger.kernel.org, dri-devel@lists.freedesktop.org, Brendan Higgins , linux-riscv@lists.infradead.org, David Airlie , Arthur Grillo , =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, Daniel Diaz , linux-sh@vger.kernel.org, Naresh Kamboju , =?UTF-8?q?Ma=C3=ADra=20Canal?= , Dan Carpenter , Linux Kernel Functional Testing , Guenter Roeck , Kees Cook , Arnd Bergmann , Maarten Lankhorst , Maxime Ripard , David Gow , Daniel Vetter , linux-arm-kernel@lists.infradead.org, kunit-dev@googlegroups.com, linux-parisc@vger.kernel.org, net dev@vger.kernel.org, linux-kernel@vger.kernel.org, Thomas Zimmermann , Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Add name of functions triggering warning backtraces to the __bug_table object section to enable support for suppressing WARNING backtraces. To limit image size impact, the pointer to the function name is only added to the __bug_table section if both CONFIG_KUNIT_SUPPRESS_BACKTRACE and CONFIG_DEBUG_BUGVERBOSE are enabled. Otherwise, the __func__ assembly parameter is replaced with a (dummy) NULL parameter to avoid an image size increase due to unused __func__ entries (this is necessary because __func__ is not a define but a virtual variable). Tested-by: Linux Kernel Functional Testing Acked-by: Dan Carpenter Cc: Michael Ellerman Signed-off-by: Guenter Roeck --- v2: - Rebased to v6.9-rc1 - Added Tested-by:, Acked-by:, and Reviewed-by: tags - Introduced KUNIT_SUPPRESS_BACKTRACE configuration option v3: - Rebased to v6.9-rc2 arch/powerpc/include/asm/bug.h | 37 +++++++++++++++++++++++++--------- 1 file changed, 28 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h index 1db485aacbd9..5b06745d20aa 100644 --- a/arch/powerpc/include/asm/bug.h +++ b/arch/powerpc/include/asm/bug.h @@ -14,6 +14,9 @@ .section __bug_table,"aw" 5001: .4byte \addr - . .4byte 5002f - . +#ifdef CONFIG_KUNIT_SUPPRESS_BACKTRACE + .4byte 0 +#endif .short \line, \flags .org 5001b+BUG_ENTRY_SIZE .previous @@ -32,30 +35,46 @@ #endif /* verbose */ #else /* !__ASSEMBLY__ */ -/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and - sizeof(struct bug_entry), respectively */ +/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3,%4 to be FILE, __func__, LINE, flags + and sizeof(struct bug_entry), respectively */ #ifdef CONFIG_DEBUG_BUGVERBOSE + +#ifdef CONFIG_KUNIT_SUPPRESS_BACKTRACE +# define HAVE_BUG_FUNCTION +# define __BUG_FUNC_PTR " .4byte %1 - .\n" +#else +# define __BUG_FUNC_PTR +#endif /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */ + #define _EMIT_BUG_ENTRY \ ".section __bug_table,\"aw\"\n" \ "2: .4byte 1b - .\n" \ " .4byte %0 - .\n" \ - " .short %1, %2\n" \ - ".org 2b+%3\n" \ + __BUG_FUNC_PTR \ + " .short %2, %3\n" \ + ".org 2b+%4\n" \ ".previous\n" #else #define _EMIT_BUG_ENTRY \ ".section __bug_table,\"aw\"\n" \ "2: .4byte 1b - .\n" \ - " .short %2\n" \ - ".org 2b+%3\n" \ + " .short %3\n" \ + ".org 2b+%4\n" \ ".previous\n" #endif +#ifdef HAVE_BUG_FUNCTION +# define __BUG_FUNC __func__ +#else +# define __BUG_FUNC NULL +#endif + #define BUG_ENTRY(insn, flags, ...) \ __asm__ __volatile__( \ "1: " insn "\n" \ _EMIT_BUG_ENTRY \ - : : "i" (__FILE__), "i" (__LINE__), \ + : : "i" (__FILE__), "i" (__BUG_FUNC), \ + "i" (__LINE__), \ "i" (flags), \ "i" (sizeof(struct bug_entry)), \ ##__VA_ARGS__) @@ -80,7 +99,7 @@ if (x) \ BUG(); \ } else { \ - BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \ + BUG_ENTRY(PPC_TLNEI " %5, 0", 0, "r" ((__force long)(x))); \ } \ } while (0) @@ -90,7 +109,7 @@ if (__ret_warn_on) \ __WARN(); \ } else { \ - BUG_ENTRY(PPC_TLNEI " %4, 0", \ + BUG_ENTRY(PPC_TLNEI " %5, 0", \ BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ "r" (__ret_warn_on)); \ } \ -- 2.39.2