1*4882a593SmuzhiyunClearing WARN_ONCE 2*4882a593Smuzhiyun------------------ 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunWARN_ONCE / WARN_ON_ONCE / printk_once only emit a message once. 5*4882a593Smuzhiyun 6*4882a593Smuzhiyunecho 1 > /sys/kernel/debug/clear_warn_once 7*4882a593Smuzhiyun 8*4882a593Smuzhiyunclears the state and allows the warnings to print once again. 9*4882a593SmuzhiyunThis can be useful after test suite runs to reproduce problems. 10