static int __proc_debug_mb(void *data, int write,
loff_t pos, void __user *buffer, int nob)
{
if (!write) {
char tmpstr[32];
int len = snprintf(tmpstr, sizeof(tmpstr), "%d",
cfs_trace_get_debug_mb());
if (pos >= len)
return 0;
return cfs_trace_copyout_string(buffer, nob, tmpstr + pos,
"\n");
}
return cfs_trace_set_debug_mb_usrstr(buffer, nob);
}
static int libcfs_param_debug_mb_set(const char *val,
const struct kernel_param *kp)
{
int rc;
unsigned int num;
rc = kstrtouint(val, 0, &num);
if (rc < 0)
return rc;
if (!*((unsigned int *)kp->arg)) {
*((unsigned int *)kp->arg) = num;
return 0;
}
rc = cfs_trace_set_debug_mb(num);
if (!rc)
*((unsigned int *)kp->arg) = cfs_trace_get_debug_mb();
return rc;
}
int libcfs_debug_init(unsigned long bufsize)
{
unsigned int max = libcfs_debug_mb;
int rc = 0;
init_waitqueue_head(&debug_ctlwq);
if (libcfs_console_max_delay <= 0 || /* not set by user or */
libcfs_console_min_delay <= 0 || /* set to invalid values */
libcfs_console_min_delay >= libcfs_console_max_delay) {
libcfs_console_max_delay = CDEBUG_DEFAULT_MAX_DELAY;
libcfs_console_min_delay = CDEBUG_DEFAULT_MIN_DELAY;
}
if (libcfs_debug_file_path) {
strlcpy(libcfs_debug_file_path_arr,
libcfs_debug_file_path,
sizeof(libcfs_debug_file_path_arr));
}
/* If libcfs_debug_mb is set to an invalid value or uninitialized
* then just make the total buffers smp_num_cpus * TCD_MAX_PAGES
*/
if (max > cfs_trace_max_debug_mb() || max < num_possible_cpus()) {
max = TCD_MAX_PAGES;
} else {
max = max / num_possible_cpus();
max <<= (20 - PAGE_SHIFT);
}
rc = cfs_tracefile_init(max);
if (!rc) {
libcfs_register_panic_notifier();
libcfs_debug_mb = cfs_trace_get_debug_mb();
}
return rc;
}