From: Tan Xiaojun Date: Thu, 24 Sep 2015 03:27:47 +0000 (+0800) Subject: CMA: fix CONFIG_CMA_SIZE_MBYTES overflow in 64bit X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a785ce9c90bc7d73b5cae4388641b310948509cb;p=linux-beck.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c index 950fff9ce453..426ba2772fe6 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;