/* Bias the spin lock on fork */

%{
#define LOCK_BIAS ((1ULL << 32) - (1ULL << 15))
%}

function bias_siglock (task:long)
%{
	struct task_struct *tsk = (struct task_struct*)THIS->task;
	tsk->sighand->siglock.raw_lock.lock = LOCK_BIAS + (LOCK_BIAS << 32);
%}

function is_err (value:long)
%{
	THIS->__retvalue = IS_ERR_VALUE((unsigned long)THIS->value);
%}

probe kernel.function("copy_process").return
{
	if (!is_err($return))
		bias_siglock($return);
}