Commit 3f045de7 authored by Nam Cao's avatar Nam Cao Committed by Steven Rostedt (Google)
Browse files

panic: Add vpanic() 



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

Signed-off-by: default avatarNam Cao <namcao@linutronix.de>
Reviewed-by: default avatarPetr Mladek <pmladek@suse.com>
Signed-off-by: default avatarSteven Rostedt (Google) <rostedt@goodmis.org>
parent 0af3ecdd

include/linux/panic.h

+3 −0
Original line number Diff line number Diff line
@@ -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);

kernel/panic.c

+12 −4
Original line number Diff line number Diff line
@@ -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)			\