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enum errorcode { ERR_NONE=0, ERR_NO_MEM };
enum errorcode _stp_error = ERR_NONE;
/** Allocates memory within a probe.
* This is used for small allocations from within a running
* probe where the process cannot sleep.
* @param len Number of bytes to allocate.
* @return a valid pointer on success or NULL on failure.
* @bug Currently uses kmalloc (GFP_ATOMIC).
*/
inline void *_stp_alloc(size_t len)
{
void *ptr = kmalloc(len, GFP_ATOMIC);
if (ptr == NULL)
_stp_error = ERR_NO_MEM;
return ptr;
}
/** Allocates and clears memory within a probe.
* This is used for small allocations from within a running
* probe where the process cannot sleep.
* @param len Number of bytes to allocate.
* @return a valid pointer on success or NULL on failure.
* @bug Currently uses kmalloc (GFP_ATOMIC).
*/
inline void *_stp_calloc(size_t len)
{
void *ptr = _stp_alloc(len);
if (ptr)
memset(ptr, 0, len);
return ptr;
}
/** Allocates and clears memory outside a probe.
* This is typically used in the module initialization to
* allocate new maps, lists, etc.
* @param len Number of bytes to allocate.
* @return a valid pointer on success or NULL on failure.
*/
inline void *_stp_valloc(size_t len)
{
void *ptr = vmalloc(len);
if (ptr)
memset(ptr, 0, len);
else
_stp_error = ERR_NO_MEM;
return ptr;
}
/** Frees memory allocated by _stp_alloc or _stp_calloc.
* @param ptr pointer to memory to free
*/
inline void _stp_free(void *ptr)
{
if (ptr)
kfree(ptr);
}
/** Frees memory allocated by _stp_valloc.
* @param ptr pointer to memory to free
*/
inline void _stp_vfree(void *ptr)
{
if (ptr)
vfree(ptr);
}
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