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/* -*- linux-c -*-
* Systemtap Atomic Test Module
* Copyright (C) 2010 Red Hat Inc.
*
* 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/kernel.h>
#include <linux/module.h>
#include <asm/atomic.h>
/* The purpose of this module is to provide a bunch of functions that */
/* do nothing important, and then call them in different contexts. */
/* We use a /proc file to trigger function calls from user context. */
/* Then systemtap scripts set probes on the functions and run tests */
/* to see if the expected output is received. This is better than using */
/* the kernel because kernel internals frequently change. */
/************ Below are the functions to create this module ************/
struct {
ulong barrier1;
atomic_long_t a;
ulong barrier2;
} stp_atomic_struct;
atomic_long_t *stp_get_atomic_long_addr(void)
{
return(&stp_atomic_struct.a);
}
EXPORT_SYMBOL(stp_get_atomic_long_addr);
int init_module(void)
{
stp_atomic_struct.barrier1 = ULONG_MAX;
atomic_long_set(&stp_atomic_struct.a, 5);
stp_atomic_struct.barrier2 = ULONG_MAX;
return 0;
}
void cleanup_module(void)
{
}
MODULE_DESCRIPTION("systemtap atomic test module");
MODULE_LICENSE("GPL");
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