From patchwork Tue Mar 12 17:03:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guenter Roeck X-Patchwork-Id: 13590547 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 80312C54E5D for ; Tue, 12 Mar 2024 19:31:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=0NXcaIOiB2YZT32S4bQ6f9kowjOuNH+kfHqHdM+qLeA=; b=zdAAUeXqZvBE61 17bCEMCuvyG7l3mKphVU+ny8sswy+ioTwarShxKNNy1vYvvEWnMDWJsJDRaUQrkhfe0gztBxnrrBg Zmo7HvX0qhrfeqDfUQMJF/Y8eWmRTGzPaWLD8NBckYzBxRUaBknROAOqK/91cdbF2zvSKlLWOlY8o xEcuPz6Y42H/+DpzX//fbxEqDOH9bx6u2lhvFYc4Ejahx2ktYR/37QK7mf7VvDgUo1zn3nMiRnzfn nsC17C476Dfh6TdrIlHnSs3vvy+CKkBHDBcMT1tO+bHPv0hLoouUNoj0+DOCRSl/V5QrVfebIq5X5 nfQ7c5Y+n3hVYzSwUF8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rk7qT-00000007ICr-2ZAE; Tue, 12 Mar 2024 19:31:29 +0000 Received: from mail-pg1-x52b.google.com ([2607:f8b0:4864:20::52b]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rk5XG-00000006ihj-3n9R; Tue, 12 Mar 2024 17:03:35 +0000 Received: by mail-pg1-x52b.google.com with SMTP id 41be03b00d2f7-5cdbc4334edso2900494a12.3; Tue, 12 Mar 2024 10:03:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1710263009; x=1710867809; darn=lists.infradead.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=5e/E6ddr2rv0O0qI6ESGYNVGq97JQ/YRs1mbYMxZhW0=; b=PX2QEuckrC/MwVZaKse7o/G7QNWSLqRIJw8rGWfcPkxmit6uDdHOKOtgRL6JIoXgSe h1vJHOsV688o0wYU2oF4uhxsy/P0LY9QPnr+jkSHvSIAnCstAaliG9nUIfLUUYO9Le1c ARYDduNS1/oxVTfLG2+tde7eeoF/A+B30Vps+CNR99LCilcZzFFDULxuqS6MDO7LUpCt ykbixU4Ua0kxsDJYwwMoveikgyFA0H6gO/EXDFH2pzNwrAiWGBGoe0ubK9nFZ6SXYS8q AUc6sffSHos1kL++PNds68/domQHc1tmxPTXIp+Pot9jotToHpNwR74+OCS/MijSuxW8 bQgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710263009; x=1710867809; 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=5e/E6ddr2rv0O0qI6ESGYNVGq97JQ/YRs1mbYMxZhW0=; b=ckAiFQx8RT4GSr0IFZdQlREIIoDdNH5+jg0BIEXrPC7cOY0cLdhE+DL15/6dXJOHk4 PdeGZZyK/rURgbZg8AISrwFRGNt1PaOxaXHHEKDNbRGR3tZlHYywxoeX6onjA+SMI9B+ laCer/Y9ceJOGqQXO69qScE0p2wGLzmv/w4jQ1ZGiMbniaMqNYy7Rs14QfA0RAmZIR7Y THQ80Xv8YhPBlNM/DWPf3oLGyBrPYEBVkfToVy8eJHlcSCJd5WH7OWudUt7cZWxo22iQ ++hWlCX56oSBXYpJ+Ul/jDGkLiR6nXHlbV9Ha4enIO3VW1ajcr5rsUfbN2RlA3TC1XWI adiQ== X-Forwarded-Encrypted: i=1; AJvYcCXw99rVvy6eLaw3Mn4q05M7kU2UaYxIj0rB4yUR8H3suVnDTdmV7k17YWp7fk/uKs5HhMLdx7XZKRNCLfxaqIPZMa/rHT7Uv1WtuMZXyp0bsgxggRx8wePsN0yvmvWhA4G4DSlSZg0ZNlAPi9Tfzbps5XLY9c4= X-Gm-Message-State: AOJu0YzNrLCNL5B+0ZgcuMxrJyPDRdomoVGeYhl5sxSlqjJ5I4CGy+3a k5juexR3Ex/Ctwbf2/fABzL1y80NTwMAcp37LY10fWfViPTzYG8N X-Google-Smtp-Source: AGHT+IHnpV6pQ4sbhTQFUz6ATEKXpUTcdarefNsnZ32RzB7TxwrdDKUDIv3vmdM+PJbrepqm0Atu1Q== X-Received: by 2002:a17:90a:ba93:b0:29c:844:a91 with SMTP id t19-20020a17090aba9300b0029c08440a91mr5600961pjr.48.1710263008670; Tue, 12 Mar 2024 10:03:28 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id bf20-20020a17090b0b1400b0029bc2b845c4sm5986405pjb.11.2024.03.12.10.03.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 12 Mar 2024 10:03:28 -0700 (PDT) From: Guenter Roeck To: linux-kselftest@vger.kernel.org Cc: David Airlie , Arnd Bergmann , =?utf-8?q?Ma=C3=ADra_Canal?= , Dan Carpenter , Kees Cook , Daniel Diaz , David Gow , Arthur Grillo , Brendan Higgins , Naresh Kamboju , Maarten Lankhorst , Andrew Morton , Maxime Ripard , =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , Daniel Vetter , Thomas Zimmermann , dri-devel@lists.freedesktop.org, kunit-dev@googlegroups.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, loongarch@lists.linux.dev, netdev@lists.linux.dev, Guenter Roeck Subject: [PATCH 07/14] x86: Add support for suppressing warning backtraces Date: Tue, 12 Mar 2024 10:03:02 -0700 Message-Id: <20240312170309.2546362-8-linux@roeck-us.net> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240312170309.2546362-1-linux@roeck-us.net> References: <20240312170309.2546362-1-linux@roeck-us.net> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240312_100331_255779_62037F8B X-CRM114-Status: GOOD ( 12.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 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). Signed-off-by: Guenter Roeck --- arch/x86/include/asm/bug.h | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h index a3ec87d198ac..d87bf8bab238 100644 --- a/arch/x86/include/asm/bug.h +++ b/arch/x86/include/asm/bug.h @@ -23,18 +23,28 @@ #ifdef CONFIG_DEBUG_BUGVERBOSE +#if IS_ENABLED(CONFIG_KUNIT) +# define HAVE_BUG_FUNCTION +# define __BUG_FUNC_PTR __BUG_REL(%c1) +# define __BUG_FUNC __func__ +#else +# define __BUG_FUNC_PTR +# define __BUG_FUNC NULL +#endif /* IS_ENABLED(CONFIG_KUNIT) */ + #define _BUG_FLAGS(ins, flags, extra) \ do { \ asm_inline volatile("1:\t" ins "\n" \ ".pushsection __bug_table,\"aw\"\n" \ "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \ - "\t.word %c1" "\t# bug_entry::line\n" \ - "\t.word %c2" "\t# bug_entry::flags\n" \ - "\t.org 2b+%c3\n" \ + "\t" __BUG_FUNC_PTR "\t# bug_entry::function\n" \ + "\t.word %c2" "\t# bug_entry::line\n" \ + "\t.word %c3" "\t# bug_entry::flags\n" \ + "\t.org 2b+%c4\n" \ ".popsection\n" \ extra \ - : : "i" (__FILE__), "i" (__LINE__), \ + : : "i" (__FILE__), "i" (__BUG_FUNC), "i" (__LINE__),\ "i" (flags), \ "i" (sizeof(struct bug_entry))); \ } while (0) @@ -80,7 +90,8 @@ do { \ do { \ __auto_type __flags = BUGFLAG_WARNING|(flags); \ instrumentation_begin(); \ - _BUG_FLAGS(ASM_UD2, __flags, ASM_REACHABLE); \ + if (!IS_SUPPRESSED_WARNING(__func__)) \ + _BUG_FLAGS(ASM_UD2, __flags, ASM_REACHABLE); \ instrumentation_end(); \ } while (0)