Messages in this thread Patch in this message | | | From | Tan Xiaojun <> | Subject | [PATCH RESEND] CMA: fix CONFIG_CMA_SIZE_MBYTES overflow in 64bit | Date | Thu, 24 Sep 2015 11:27:47 +0800 |
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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@huawei.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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