From nobody Tue Oct 7 14:06:29 2025 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 C6C952248AC; Wed, 9 Jul 2025 17:56:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752083800; cv=none; b=VeQtJ2PaItPHKK2txXKObkvQbvX4+dpgI6XPgqYAPph096CQDQdYbDAuStLbjr1pJ1YMbsAlXDVeGfhA0CFT/0Y1ka3Xj6wF4GZ4bX9ZXN0jxsQn6HAYVwJSYfJkY/Bp87ZeJzZYwLi09AHtenkBRQ+pxrL2hSskAV026xMYnmM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752083800; c=relaxed/simple; bh=2IXfDh1oS1h6wWEMQZiEwy1hIKMEajle4bNe7OQluPA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nDMqftB37Foaxv7UkFdHUbdnEK7ZmqcWNisKD7aq0voEYnvvTYxIPVoEMx3tfC5/BqL5v4CWQHGrIbbpMA8ymNBGnKX6P7zlqG4CP4/cgMP0ICiAnBDdKB5jYCN7XwVRKq2+iit8jnVVm4Z1ZtvQuWixqGWRoHVYntXwnvHgQUs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=RCAu4O+G; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=Ye8zkOjz; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="RCAu4O+G"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="Ye8zkOjz" From: Nam Cao DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1752083797; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BWqBXMYBmwEqdQKIVhrED21UDRTdi5qDQ7ZTDhJVn3E=; b=RCAu4O+G8bC7ggMerWc9euMZBi5CYZ2Vq2NudpW40yBpC0GheFd19md8jzhFY7t1VPFUV1 OcFgArVec5Ql6QcMw+d8pjXjAS/lFLyqZd4x84bc2EH0KfO8h6EHs3vfqZT3Pw1a+vPZmK T6T2kqhBFK9W71PfEf23xB8JQqpXDruoHxQYkmU2ANLEVftIU70unCoCLyDyt44/CEoans mYOQy3sUxKM7tVDYaPc+JAk5b5rPTcETYqhGILbzMkkSBY9Z9UnfjE1ypzzrRdqiC//9d0 BjbgmFZHwuXhkGkA474Q8CvIqFW+CUQfjLiJfBpV8zTUj3hn3UuTW97kfUlB4g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1752083797; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BWqBXMYBmwEqdQKIVhrED21UDRTdi5qDQ7ZTDhJVn3E=; b=Ye8zkOjzTuiE/LEPLUv/OVCa/GhVx5B2Nd1E+MXnl3WAYY9+ybtUWcyaPvLqLBHPGsj4Gq 5Af7sorvOc5jKLCg== To: Steven Rostedt , John Ogness , Masami Hiramatsu , Mathieu Desnoyers , Gabriele Monaco , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Nam Cao , Petr Mladek , Sergey Senozhatsky Subject: [PATCH v12 03/12] panic: Add vpanic() Date: Wed, 9 Jul 2025 19:56:20 +0200 Message-Id: <0b081781ea986d00da937affa7a5e281d6869f99.1752082806.git.namcao@linutronix.de> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" vpanic() is useful for implementing runtime verification reactors. Add it. Signed-off-by: Nam Cao Reviewed-by: Petr Mladek --- Cc: John Ogness Cc: Sergey Senozhatsky --- include/linux/panic.h | 3 +++ kernel/panic.c | 16 ++++++++++++---- 2 files changed, 15 insertions(+), 4 deletions(-) diff --git a/include/linux/panic.h b/include/linux/panic.h index 4adc65766935..0332c6d6771f 100644 --- a/include/linux/panic.h +++ b/include/linux/panic.h @@ -3,6 +3,7 @@ #define _LINUX_PANIC_H =20 #include +#include #include =20 struct pt_regs; @@ -10,6 +11,8 @@ struct pt_regs; extern long (*panic_blink)(int state); __printf(1, 2) void panic(const char *fmt, ...) __noreturn __cold; +__printf(1, 0) +void vpanic(const char *fmt, va_list args) __noreturn __cold; void nmi_panic(struct pt_regs *regs, const char *msg); void check_panic_on_warn(const char *origin); extern void oops_enter(void); diff --git a/kernel/panic.c b/kernel/panic.c index b0b9a8bf4560..6a1823c383d0 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -309,13 +309,13 @@ static void panic_other_cpus_shutdown(bool crash_kexe= c) /** * panic - halt the system * @fmt: The text string to print + * @args: Arguments for the format string * * Display a message, then perform cleanups. This function never returns. */ -void panic(const char *fmt, ...) +void vpanic(const char *fmt, va_list args) { static char buf[1024]; - va_list args; long i, i_next =3D 0, len; int state =3D 0; int old_cpu, this_cpu; @@ -366,9 +366,7 @@ void panic(const char *fmt, ...) =20 console_verbose(); bust_spinlocks(1); - va_start(args, fmt); len =3D vscnprintf(buf, sizeof(buf), fmt, args); - va_end(args); =20 if (len && buf[len - 1] =3D=3D '\n') buf[len - 1] =3D '\0'; @@ -505,7 +503,17 @@ void panic(const char *fmt, ...) mdelay(PANIC_TIMER_STEP); } } +EXPORT_SYMBOL(vpanic); =20 +/* Identical to vpanic(), except it takes variadic arguments instead of va= _list */ +void panic(const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + vpanic(fmt, args); + va_end(args); +} EXPORT_SYMBOL(panic); =20 #define TAINT_FLAG(taint, _c_true, _c_false, _module) \ --=20 2.39.5