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Message-ID: <b1100f23-7a75-c5a0-851c-42d62554efa2@cybernetics.com>
Date: Tue, 7 Jun 2022 14:44:58 -0400
From: Tony Battersby <tonyb@...ernetics.com>
To: linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc: iommu@...ts.linux-foundation.org, kernel-team@...com,
Matthew Wilcox <willy@...radead.org>,
Keith Busch <kbusch@...nel.org>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Robin Murphy <robin.murphy@....com>,
Tony Lindgren <tony@...mide.com>
Subject: [PATCH v6 08/11] 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.
Signed-off-by: Tony Battersby <tonyb@...ernetics.com>
---
mm/dmapool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/dmapool.c b/mm/dmapool.c
index 44038089a41a..c7ec38cb4631 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);
--
2.25.1
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