linux-kernel - [PATCH RESEND] CMA: fix CONFIG_CMA_SIZE

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Date:	Thu, 24 Sep 2015 11:27:47 +0800
From:	Tan Xiaojun <tanxiaojun@...wei.com>
To:	<gregkh@...uxfoundation.org>, <kyungmin.park@...sung.com>,
	<iamjoonsoo.kim@....com>, <grant.likely@...aro.org>,
	<arnd@...db.de>, <joshc@...eaurora.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Tan Xiaojun <tanxiaojun@...wei.com>
Subject: [PATCH RESEND] CMA: fix CONFIG_CMA_SIZE_MBYTES overflow in 64bit

In 64bit system, if you set CONFIG_CMA_SIZE_MBYTES>=2048, it will
overflow and size_bytes will be a big wrong number.

Set CONFIG_CMA_SIZE_MBYTES=2048 and you will get an info below
during system boot:

*********
cma: Failed to reserve 17592186042368 MiB
*********

Signed-off-by: Tan Xiaojun <tanxiaojun@...wei.com>
---
 drivers/base/dma-contiguous.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 950fff9..426ba27 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -46,7 +46,7 @@ struct cma *dma_contiguous_default_area;
  * Users, who want to set the size of global CMA area for their system
  * should use cma= kernel parameter.
  */
-static const phys_addr_t size_bytes = CMA_SIZE_MBYTES * SZ_1M;
+static const phys_addr_t size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M;
 static phys_addr_t size_cmdline = -1;
 static phys_addr_t base_cmdline;
 static phys_addr_t limit_cmdline;
-- 
1.7.9.5

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