MAX_CMDLEN
cmd_buf = kmalloc(MAX_CMDLEN, GFP_KERNEL);
static char wdt_cmd[MAX_CMDLEN] = DEFAULT_CMD;
module_param_string(cmd, wdt_cmd, MAX_CMDLEN, 0644);
len = strscpy(cmd_buf, cmd, MAX_CMDLEN);
ASCEBC(cmd_buf, MAX_CMDLEN);
EBC_TOUPPER(cmd_buf, MAX_CMDLEN);
char buf[MAX_CMDLEN];
p = fgets(buf, MAX_CMDLEN, fp);
char buf[MAX_CMDLEN], *p;
if (!fgets(buf, MAX_CMDLEN, fp))