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: 13590376 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 64A4BC54E5D for ; Tue, 12 Mar 2024 17:03:31 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8F2D1112F29; Tue, 12 Mar 2024 17:03:30 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="kz23VamI"; dkim-atps=neutral Received: from mail-pg1-f176.google.com (mail-pg1-f176.google.com [209.85.215.176]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5271C10E789 for ; Tue, 12 Mar 2024 17:03:29 +0000 (UTC) Received: by mail-pg1-f176.google.com with SMTP id 41be03b00d2f7-5e4613f2b56so4042580a12.1 for ; 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.freedesktop.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=kz23VamIN6lZGFQ6uozDqOViiEfMICe2P0xCr6tm1DeJRVkt5lyzFC7laBKbh5QSNp fXM7ypzMpDfavbTqtZzyxkrk9PyT1od14Y6sBCO26SlUU50VCOebKDoXS5UEpXIffRJu HLGyHDVWqBGmgJmdCVNvtyzjCmKieOG7bzO324dRMN8WUPsyKjttBhhkc1XCPBK513VD 2Qh97Z0PABys0yLBsLq1hbyRP5w+APy7Ax2MRCOJbnXvCPtVKCinAOOVSQ9ZFNrHuHoc 18VgxF0taxNxJI9RPPsBJFdWnptIDAmO2h521UQ3az4sF0Xr0uZSy1fRe1thd0iq3msm P6mQ== 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=vWbpGj8Q8kl5HiTw75LQRO52Nq2NmfMKmJ2XTtd9WQkkTdrqXlm3cfePI5xjgqRl4O J82f0dlwog7mUPzC57ENF/NjUozmPDUxifROupkKmAYn3BMxI5ouLA2zfk2Iqh/2xfmS 7kldn9zOeGWnwn/06iQuyRFaLyKmuG2EwPmqdm9hYtvE7JSkgAOHOfUd5PwtaAwIeray UlIITRDBENjZm5E82mP0geEBfO1z370NvHzFFqLR2fLuGkT7SVf9PCz8frr0HMZc/fMt 2BsQihzCCEMGvfZXhKoLw7LolxtznRJQW1gYQGYXmo8+Pj3FKSHeIQVidsf0Amq/ZYWv s2Xw== X-Forwarded-Encrypted: i=1; AJvYcCX2qYRcMBmGr2ZXYiaXVsF2hBYg/qPJO2wuEydwg4etnLX17nefbpcscTzt0nQnQcmh3yweYF05K0KTQrd/8rZ0AuMM6p+3JfdynaWA47Ie X-Gm-Message-State: AOJu0Yww+DBR9czTkvlKzYXnx+zgnpaYogD/5vPm5x8bRD5QWS/jYpJl fvFnP266MS8Ev2XyAdcxvPQ6iUMm2IUEbcFeahbSpGjCmcFSiW3B 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-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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)