linux-kernel - [PATCH v2 1/4] mm: Add support for __GFP_ZERO flag to dma_pool

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Date:	Fri, 31 Jul 2015 12:36:41 -0700
From:	"Sean O. Stalley" <sean.stalley@...el.com>
To:	corbet@....net, vinod.koul@...el.com, bhelgaas@...gle.com,
	Julia.Lawall@...6.fr, Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
	mmarek@...e.cz, akpm@...ux-foundation.org
Cc:	sean.stalley@...el.com, bigeasy@...utronix.de,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-mm@...ck.org, cocci@...teme.lip6.fr
Subject: [PATCH v2 1/4] mm: Add support for __GFP_ZERO flag to dma_pool_alloc()

Currently the __GFP_ZERO flag is ignored by dma_pool_alloc().
Make dma_pool_alloc() zero the memory if this flag is set.

Signed-off-by: Sean O. Stalley <sean.stalley@...el.com>
---
 mm/dmapool.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/dmapool.c b/mm/dmapool.c
index fd5fe43..bd49386 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -334,7 +334,7 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
 	/* pool_alloc_page() might sleep, so temporarily drop &pool->lock */
 	spin_unlock_irqrestore(&pool->lock, flags);
 
-	page = pool_alloc_page(pool, mem_flags);
+	page = pool_alloc_page(pool, mem_flags & (~__GFP_ZERO));
 	if (!page)
 		return NULL;
 
@@ -372,9 +372,14 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
 			break;
 		}
 	}
-	memset(retval, POOL_POISON_ALLOCATED, pool->size);
+	if (!(mem_flags & __GFP_ZERO))
+		memset(retval, POOL_POISON_ALLOCATED, pool->size);
 #endif
 	spin_unlock_irqrestore(&pool->lock, flags);
+
+	if (mem_flags & __GFP_ZERO)
+		memset(retval, 0, pool->size);
+
 	return retval;
 }
 EXPORT_SYMBOL(dma_pool_alloc);
-- 
1.9.1

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