Commit 19f50458 authored by Tony Battersby's avatar Tony Battersby Committed by Andrew Morton
Browse files

dmapool: speedup DMAPOOL_DEBUG with init_on_alloc 

Avoid double-memset of the same allocated memory in dma_pool_alloc() when
both DMAPOOL_DEBUG is enabled and init_on_alloc=1.

Link: https://lkml.kernel.org/r/20230126215125.4069751-6-kbusch@meta.com


Signed-off-by: default avatarTony Battersby <tonyb@cybernetics.com>
Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 347e4e44

mm/dmapool.c

+1 −1
Original line number Diff line number Diff line
@@ -356,7 +356,7 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, 
			break;

		}

	}

	if (!(mem_flags & __GFP_ZERO))

	if (!want_init_on_alloc(mem_flags))

		memset(retval, POOL_POISON_ALLOCATED, pool->size);

#endif

	spin_unlock_irqrestore(&pool->lock, flags);