From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8F6873D6495 for ; Tue, 24 Mar 2026 08:57:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774342637; cv=none; b=YQQy/cUsw/j6IRISrg4CFRKs1sbpZI1vf2iWRDvqOXBYDRvxVefrLU2SK6Ox6AHwAQq06SVb/JGKU9uk/fHeMrlNt8xa0EXGhhOe2HGTtMV11fhKxnlXnIgX1+eg80E8tvxlntyo6jO/1Kq9+nQpOAs9y9OzRQVSJ0dj6Na0wcg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774342637; c=relaxed/simple; bh=7zBFqX7ByhUH7THOne1A2FrxDyPagzTEbZXn/LE9rsE=; h=From:Date:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=RFAg0+GZ0ZGYma52kXtnbx4TfmcgtLOuGpguCIpMO/m4Om76TBXwjide80h+uNj1E5q5qDghtkKyAf80pDmfAKU7UGAbTuuHnB0PUG5NZwmYumzZRiM4/4BIW5OaR0K1/enymRrGAOsO3L4AIzTVgDF2rYrwfefiTBsChEYXC04= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=oOCZO/5g; arc=none smtp.client-ip=209.85.128.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="oOCZO/5g" Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-4852e9ca034so34509955e9.2 for ; Tue, 24 Mar 2026 01:57:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1774342634; x=1774947434; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:from:to:cc:subject:date:message-id:reply-to; bh=2N8pM8rI/exlpoJn6H8Uz7b0TMfTyl2xUTL4+Iyxt4A=; b=oOCZO/5gucluzXtpEeCsf7fX31zKjRapIzVuC8mUmcW/w9zdVA+/IKyaDM+97QFbDF Jc4hsZqmldPCWgltTpS3xjoyzH+nssEpjScwHwH7fniYXBjVyHJlvngF/IsvZR7Fu0oo t23txzJf9wKvTmTswudfLPbLDRExU5JMredYiIlPjyn5Zj+t5kCiSVbVefUZMfDATjoS QSPj4Naij2cQUj5eQQEBRhVQDvhI+SKfNoXkZu8rvjOgZGu1LKdOyrZkXq3J6cNrd9ds 0HC29iHZwUpsik521V1+eUICQd3PZ9gYNMeU9kazLONPDnUPjMpaODaIPN5d+/Kh0KE6 t4PA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774342634; x=1774947434; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:date:from:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2N8pM8rI/exlpoJn6H8Uz7b0TMfTyl2xUTL4+Iyxt4A=; b=jt9E3p56m4tPWxakJnF9a8tkbr1IL6LqZfXyQV7Em/9ReNZQSYxo4Mz1tUnxKk+9IN LlLRiomDHNaGvo6CSpEU+Nf58PXNfar5imhvoibmC3W5Fe3fi3TkA5rp95vCEcdXsTwO Ed3zCzxzsldg/E/z7yAzbzgXa8iiQsCVQTBDFTSKhr72D0CrZNeNeTgzOz4uUx6zJ4TO /yliRwJNnrz+Jm+M3+DiDi9113ydUISxo/9ipNiO+ZHmDOPzUqjjVzizTPOGm/6/i2gP P175SOZ8asgGvzxcqRwJVFdy63X/z7EEV4PK33NB6eyuvDKttoW0nA/W7uUK0APvwp9b ISqA== X-Forwarded-Encrypted: i=1; AJvYcCU3QQP59hz4HH5cN8GKR01NiZ7KsALjiMynUIjW99EOWHQpLENcAT0VqtcQx9qL3rI7dhs40vSqVscWQeA=@vger.kernel.org X-Gm-Message-State: AOJu0YyOAyij8db4KytG5nbVEt0Ivv2rj7/Iiq0smjSCAvo9Ki/lTh41 UiG3286FA57EOqW/i+6RZWaQBp49cVBqaRWeUAgbCznrbCeY6dYjDIEQ X-Gm-Gg: ATEYQzxk1nxsw7wJtM6+GGuutKBxXwKFZmB4evS73Dyrckp/8cV2+7m8suNX9tB+2Ix MLJWdVxmY7qjCeMtN16xPjuiW2cbm57sRGip7ZgGCqrbNO+supxYUoDim6glou/vbEBerT1AvDD nca2ibzQ+6EEoBJwnaYEgeDWnuEnY7pdYgU54ki6gyXcftiAz+YcA8023+fhEXqHsKNdPT+44/z egO2sOCJWa+jS64N9CO9ADVC1uKbXjR3qppxwEZrIOZzHLYAS8I7lWPR7QYqvTaTgJHvC3kUhuu E5dg3oiOIkwkCEjCuZM7QZNdac9e0GTlB/3s9m4BdXqS998BZifyPPfofWkrWl4k0brTEMq0N6w DdiXln2ycXDiXhevlwQXZZ+w64Wnr52EnNwI/j+ZBGSgPAu4jf9P5rCY4aoT0Kbjj2WcQ0GDO X-Received: by 2002:a05:600c:4714:b0:485:3bc7:a231 with SMTP id 5b1f17b1804b1-486ff01f1d0mr218776415e9.29.1774342633627; Tue, 24 Mar 2026 01:57:13 -0700 (PDT) Received: from krava ([2a02:8308:a00c:e200::d99c]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-487116ee514sm43591345e9.13.2026.03.24.01.57.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2026 01:57:13 -0700 (PDT) From: Jiri Olsa X-Google-Original-From: Jiri Olsa Date: Tue, 24 Mar 2026 09:57:11 +0100 To: Sasha Levin Cc: Andrew Morton , Masahiro Yamada , Nathan Chancellor , Nicolas Schier , 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 Subject: Re: [PATCH 0/2] kallsyms: show typed function parameters in oops/WARN dumps Message-ID: References: <20260323164858.1939248-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260323164858.1939248-1-sashal@kernel.org> On Mon, Mar 23, 2026 at 12:48:55PM -0400, Sasha Levin wrote: > Building on the lineinfo series, this adds typed function parameter hi, could you please specify the exact tree/commit and point to the series this patchset is based on? thanks, jirka > 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 > >