idr_pre_get — reserve resources for idr allocation
int idr_pre_get (
struct idr * idp, gfp_t gfp_mask)
;
This function should be called prior to calling the idr_get_new* functions. It preallocates enough memory to satisfy the worst possible allocation. The caller should pass in GFP_KERNEL if possible. This of course requires that no spinning locks be held.
If the system is REALLY out of memory this function returns 0
,
otherwise 1
.