[PATCH 05/11] dmapool: speedup DMAPOOL_DEBUG with init_on_alloc

From: Keith Busch
Date: Mon Dec 05 2022 - 10:20:56 EST


From: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>

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

Signed-off-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
---
mm/dmapool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/dmapool.c b/mm/dmapool.c
index ee993bb59fc27..eaed3ffb42aa8 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -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);
--
2.30.2