[PATCH v10 03/19] panic: Add vpanic()
From: Nam Cao <hidden>
Date: 2025-06-10 09:44:03
Also in:
lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
vpanic() is useful for implementing runtime verification reactors. Add it. Signed-off-by: Nam Cao <redacted> Reviewed-by: Petr Mladek <pmladek@suse.com> --- Cc: John Ogness <john.ogness@linutronix.de> Cc: Sergey Senozhatsky <senozhatsky@chromium.org> --- 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 4adc657669354..0332c6d6771fb 100644
--- a/include/linux/panic.h
+++ b/include/linux/panic.h@@ -3,6 +3,7 @@ #define _LINUX_PANIC_H #include <linux/compiler_attributes.h> +#include <linux/stdarg.h> #include <linux/types.h> 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 b0b9a8bf4560d..6a1823c383d01 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c@@ -309,13 +309,13 @@ static void panic_other_cpus_shutdown(bool crash_kexec) /** * 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 = 0, len; int state = 0; int old_cpu, this_cpu;
@@ -366,9 +366,7 @@ void panic(const char *fmt, ...) console_verbose(); bust_spinlocks(1); - va_start(args, fmt); len = vscnprintf(buf, sizeof(buf), fmt, args); - va_end(args); if (len && buf[len - 1] == '\n') buf[len - 1] = '\0';
@@ -505,7 +503,17 @@ void panic(const char *fmt, ...) mdelay(PANIC_TIMER_STEP); } } +EXPORT_SYMBOL(vpanic); +/* 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); #define TAINT_FLAG(taint, _c_true, _c_false, _module) \
--
2.39.5