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panic: Add vpanic() 

vpanic() is useful for implementing runtime verification reactors. Add it.

Signed-off-by: Nam Cao <namcao@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Nam Cao 2025-07-09 21:21:14 +02:00 committed by Steven Rostedt (Google)
parent 0af3ecdde5
commit 3f045de7f5
2 changed files with 15 additions and 4 deletions
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3
include/linux/panic.h
View File

@ -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);

16
kernel/panic.c
View File

@ -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) \