centos man page for mempool_alloc

MEMPOOL_ALLOC(9)					    Memory Management in Linux						  MEMPOOL_ALLOC(9)

NAME
       mempool_alloc - allocate an element from a specific memory pool

SYNOPSIS
       void * mempool_alloc(mempool_t * pool, gfp_t gfp_mask);

ARGUMENTS
       pool
	   pointer to the memory pool which was allocated via mempool_create.

       gfp_mask
	   the usual allocation bitmask.

DESCRIPTION
       this function only sleeps if the alloc_fn function sleeps or returns NULL. Note that due to preallocation, this function *never* fails when
       called from process contexts. (it might fail if called from an IRQ context.)

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014							  MEMPOOL_ALLOC(9)