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Commit ad82362b authored by Sean O. Stalley's avatar Sean O. Stalley Committed by Linus Torvalds
Browse files

mm: add dma_pool_zalloc() call to DMA API 



Add a wrapper function for dma_pool_alloc() to get zeroed memory.

Signed-off-by: default avatarSean O. Stalley <sean.stalley@intel.com>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Gilles Muller <Gilles.Muller@lip6.fr>
Cc: Nicolas Palix <nicolas.palix@imag.fr>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent fa23f56d

Documentation/DMA-API.txt

+7 −0
Original line number Diff line number Diff line
@@ -104,6 +104,13 @@ crossing restrictions, pass 0 for alloc; passing 4096 says memory allocated 
from this pool must not cross 4KByte boundaries.





	void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,

			      dma_addr_t *handle)



Wraps dma_pool_alloc() and also zeroes the returned memory if the

allocation attempt succeeded.





	void *dma_pool_alloc(struct dma_pool *pool, gfp_t gfp_flags,

			dma_addr_t *dma_handle);

include/linux/dmapool.h

+6 −0
Original line number Diff line number Diff line
@@ -24,6 +24,12 @@ void dma_pool_destroy(struct dma_pool *pool); 
void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,

		     dma_addr_t *handle);



static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,

				    dma_addr_t *handle)

{

	return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle);

}



void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);



/*