linux-kernel - [PATCHv3 05/12] dmapool: speedup DMAPOOL_DEBUG with init_on

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Date:   Tue, 3 Jan 2023 11:15:44 -0800
From:   Keith Busch <kbusch@...a.com>
To:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@....de>
CC:     Tony Battersby <tonyb@...ernetics.com>,
        Kernel Team <kernel-team@...a.com>,
        Keith Busch <kbusch@...nel.org>
Subject: [PATCHv3 05/12] dmapool: speedup DMAPOOL_DEBUG with init_on_alloc

From: Tony Battersby <tonyb@...ernetics.com>

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@...ernetics.com>
Signed-off-by: Keith Busch <kbusch@...nel.org>
Reviewed-by: Christoph Hellwig <hch@....de>
---
 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