// rcu tapset
// Copyright (C) 2013 Red Hat
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
%{
#include <linux/rcupdate.h>
%}
function rcu_dereference:long (protected_pointer:long) %{ /* pure */
void *protected_pointer = (void *)(long)STAP_ARG_protected_pointer;
long fetched_value;
/* We call kderef() here to ensure the memory is valid to read.
* Note the result is thrown away, then we use the "real"
* rcu_dereference function now that we know the address is
* safe. */
(void)kderef(sizeof(*protected_pointer), protected_pointer);
rcu_read_lock();
fetched_value = (long)rcu_dereference(protected_pointer);
rcu_read_unlock();
STAP_RETVALUE = fetched_value;
CATCH_DEREF_FAULT();
%}
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