If your BIOS doesn't do that it's a good idea to enable though
to make sure you log even machine check events that result
in a reboot.
+ mce=tolerancelevel (number)
+ 0: always panic, 1: panic if deadlock possible,
+ 2: try to avoid panic, 3: never panic or exit (for testing)
+ default is 1
+ Can be also set using sysfs which is preferable.
nomce (for compatibility with i386): same as mce=off
#include <linux/fs.h>
#include <linux/cpu.h>
#include <linux/percpu.h>
+#include <linux/ctype.h>
#include <asm/processor.h>
#include <asm/msr.h>
#include <asm/mce.h>
/* mce=off disables machine check. Note you can reenable it later
using sysfs.
+ mce=TOLERANCELEVEL (number, see above)
mce=bootlog Log MCEs from before booting. Disabled by default to work
around buggy BIOS that leave bogus MCEs. */
static int __init mcheck_enable(char *str)
mce_dont_init = 1;
else if (!strcmp(str, "bootlog"))
mce_bootlog = 1;
+ else if (isdigit(str[0]))
+ get_option(&str, &tolerant);
else
printk("mce= argument %s ignored. Please use /sys", str);
return 0;