From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00A563BF665; Mon, 23 Mar 2026 16:49:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774284550; cv=none; b=VQjyJ7iQGJM6Od3rD5GMBrch6qOa/URftvPPsKmJFVTQ8kMLdyOAj9GhkuzoC/v+2oDJvhP4JH/G/ucFJF0/FWV4SP5TzQHK9KOy48RGJ/4nDN5F3CyMyTbjtxZXO3o1XCIlGFJUHB2/+zgym4krJL5keAy9A3ghVzIEiG6H+jw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774284550; c=relaxed/simple; bh=EHB56yz9Q2YdtCy/0KpSoteN7vl9bwzv8n9uiKRf7Dk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=XAan5cx6J+epvf4x+cQJXDdOZVA9d4YflwSC+QfjG1ALrTWw/ayqJcsJO3s56bKNE9ujNk5ZPmsQVYvK3nset/M0tUwJ3baPxkVFIhJcsA73GXghzrxTi1u0Fi2AFaa4izV+b0VNIY/vjoL7PmWMpJlH649GHOkX//OxwaZMMwI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FF1zUqht; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FF1zUqht" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 714D2C4CEF7; Mon, 23 Mar 2026 16:49:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1774284549; bh=EHB56yz9Q2YdtCy/0KpSoteN7vl9bwzv8n9uiKRf7Dk=; h=From:To:Cc:Subject:Date:From; b=FF1zUqhtJg9+qUTuYWgAvYr63kc903U588Br0VefAPGuMNRJrXMEwgSxdyV7sdXnB J/2qvzXyXMu0oTi+kMqUwBG7cN6MPjfmygMis3jSHM0IIOfZwqZfWsZ6ZRJLcCeF6W gZ0/hziE1LcAll3J4HkHSd009maWB7ZZuJp8eKFgbaIT6xCeIJqShQSKze0gSKd2uF uJPiIg1dFZ3o4lmmBbSe2Co9LxJ5GYpgrq/RiKfQ0i7LqJSGE3s/drPCx6XfUdidTQ YBymox/1Wtf/0r+Rr68GSlvz4+5xIQqinkwQjsMXbUuBXSzz64W1heVtpBHdZ1ZsI3 YwZjkDJhNTwDQ== From: Sasha Levin To: Andrew Morton , Masahiro Yamada , Nathan Chancellor , Nicolas Schier Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Peter Zijlstra , Josh Poimboeuf , Petr Mladek , Alexei Starovoitov , Jonathan Corbet , David Gow , Kees Cook , Greg KH , Luis Chamberlain , Steven Rostedt , Helge Deller , Randy Dunlap , Geert Uytterhoeven , Juergen Gross , James Bottomley , Alexey Dobriyan , Vlastimil Babka , Laurent Pinchart , Petr Pavlu , x86@kernel.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-doc@vger.kernel.org, linux-modules@vger.kernel.org, bpf@vger.kernel.org, Sasha Levin Subject: [PATCH 0/2] kallsyms: show typed function parameters in oops/WARN dumps Date: Mon, 23 Mar 2026 12:48:55 -0400 Message-ID: <20260323164858.1939248-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Building on the lineinfo series, this adds typed function parameter display to oops and WARN dumps. A build-time tool extracts parameter names and types from DWARF, and the kernel maps pt_regs to the calling convention at crash time. When BTF is available, struct pointer parameters are dereferenced and their members displayed. Example output from a WARN in a function receiving struct new_utsname * (kernel version info) and struct file * parameters: ------------[ cut here ]------------ WARNING: drivers/tty/sysrq.c:1209 at demo_crash+0xf/0x20 (drivers/tty/sysrq.c:1209) CPU: 2 UID: 0 PID: 323 Comm: bash RIP: 0010:demo_crash+0xf/0x20 (drivers/tty/sysrq.c:1209) ... RDI: ffffffffb8ca8d00 RSI: ffffa0a3c250acc0 ... Function parameters (paraminfo_demo_crash): uts (struct new_utsname *) = 0xffffffffb8ca8d00 .sysname = "Linux" .nodename = "localhost" .release = "7.0.0-rc2-00006-g3190..." .version = "#45 SMP PRE" file (struct file * ) = 0xffffa0a3c250acc0 .f_mode = (fmode_t)67993630 .f_op = (struct file_operations *)0xffffffffb7237620 .f_flags = (unsigned int)32769 .f_cred = (struct cred *)0xffffa0a3c2e06a80 .dentry = (struct dentry *)0xffffa0a3c0978cc0 .prev_pos = (loff_t)-1 Call Trace: write_sysrq_trigger+0x96/0xb0 (drivers/tty/sysrq.c:1222) proc_reg_write+0x54/0xa0 (fs/proc/inode.c:330) vfs_write+0xc9/0x480 (fs/read_write.c:686) ksys_write+0x6e/0xe0 (fs/read_write.c:738) do_syscall_64+0xe2/0x570 (arch/x86/entry/syscall_64.c:62) entry_SYSCALL_64_after_hwframe+0x77/0x7f (arch/x86/entry/entry_64.S:121) Patch 1 adds the core paraminfo infrastructure (DWARF extraction, kernel-side lookup, register-to-parameter mapping, ~1-2 MB overhead). Patch 2 adds optional BTF-based struct rendering, gated behind CONFIG_KALLSYMS_PARAMINFO_BTF. Sasha Levin (2): kallsyms: show function parameter info in oops/WARN dumps kallsyms: add BTF-based deep parameter rendering in oops dumps .../admin-guide/kallsyms-lineinfo.rst | 31 + arch/x86/kernel/dumpstack.c | 6 +- include/linux/kallsyms.h | 9 + init/Kconfig | 40 ++ kernel/Makefile | 1 + kernel/kallsyms.c | 182 ++++++ kernel/kallsyms_internal.h | 6 + kernel/kallsyms_paraminfo_btf.c | 199 ++++++ lib/Kconfig.debug | 11 + lib/tests/Makefile | 3 + lib/tests/paraminfo_kunit.c | 249 ++++++++ scripts/Makefile | 3 + scripts/empty_paraminfo.S | 18 + scripts/gen_paraminfo.c | 597 ++++++++++++++++++ scripts/link-vmlinux.sh | 44 +- 15 files changed, 1393 insertions(+), 6 deletions(-) create mode 100644 kernel/kallsyms_paraminfo_btf.c create mode 100644 lib/tests/paraminfo_kunit.c create mode 100644 scripts/empty_paraminfo.S create mode 100644 scripts/gen_paraminfo.c -- 2.51.0