linux-kernel - [v2 2/4] ARM: dma-mapping: Use kzalloc() with GFP

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Message-ID: <1345702229-9539-3-git-send-email-hdoyu@nvidia.com>
Date:	Thu, 23 Aug 2012 09:10:27 +0300
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	<m.szyprowski@...sung.com>
CC:	Hiroshi Doyu <hdoyu@...dia.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linaro-mm-sig@...ts.linaro.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <kyungmin.park@...sung.com>,
	<arnd@...db.de>, <linux@....linux.org.uk>,
	<chunsang.jeong@...aro.org>, <vdumpa@...dia.com>,
	<konrad.wilk@...cle.com>, <subashrp@...il.com>,
	<minchan@...nel.org>, <pullip.cho@...sung.com>
Subject: [v2 2/4] ARM: dma-mapping: Use kzalloc() with GFP_ATOMIC

Use kzalloc() with GFP_ATOMIC instead of vzalloc(). At freeing,
__in_atomic_pool() checks if it comes from atomic_pool or not.

Signed-off-by: Hiroshi Doyu <hdoyu@...dia.com>
---
 arch/arm/mm/dma-mapping.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index aca2fd0..b64475a 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1029,7 +1029,7 @@ static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t
 	int array_size = count * sizeof(struct page *);
 	int i = 0;
 
-	if (array_size <= PAGE_SIZE)
+	if ((array_size <= PAGE_SIZE) || (gfp & GFP_ATOMIC))
 		pages = kzalloc(array_size, gfp);
 	else
 		pages = vzalloc(array_size);
@@ -1061,7 +1061,7 @@ error:
 	while (i--)
 		if (pages[i])
 			__free_pages(pages[i], 0);
-	if (array_size <= PAGE_SIZE)
+	if ((array_size <= PAGE_SIZE) || (gfp & GFP_ATOMIC))
 		kfree(pages);
 	else
 		vfree(pages);
@@ -1076,7 +1076,8 @@ static int __iommu_free_buffer(struct device *dev, struct page **pages, size_t s
 	for (i = 0; i < count; i++)
 		if (pages[i])
 			__free_pages(pages[i], 0);
-	if (array_size <= PAGE_SIZE)
+	if ((array_size <= PAGE_SIZE) ||
+	    __in_atomic_pool(page_address(pages[0]), size))
 		kfree(pages);
 	else
 		vfree(pages);
-- 
1.7.5.4

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