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SubjectRe: [PATCH] arm: dma-mapping: fix compilation error when CONFIG_MMU is not present
Hello,

On 2014-10-19 17:59, Stefan Hengelein wrote:
> When CONFIG_MMU is not present, the variable 'atomic_pool' and the
> function '__in_atomic_pool' are undeclared but used in part of the
> code. Therefore, the compilation breaks.
> Now, they are defined to dummy values when CONFIG_MMU is undefined.
>
> This error was found with vampyr.

Frankly, those variables are used only when CONFIG_MMU or
CONFIG_ARM_DMA_USE_IOMMU are set. The latter imho makes only sense
together with CONFIG_MMU, so the issue reported here doesn't really
happen in real world.

> Signed-off-by: Stefan Hengelein <stefan.hengelein@fau.de>
> ---
> arch/arm/mm/dma-mapping.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
> index c245d90..7d04cf7 100644
> --- a/arch/arm/mm/dma-mapping.c
> +++ b/arch/arm/mm/dma-mapping.c
> @@ -573,12 +573,14 @@ static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot)
> #else /* !CONFIG_MMU */
>
> #define nommu() 1
> +#define atomic_pool 0
>
> #define __get_dma_pgprot(attrs, prot) __pgprot(0)
> #define __alloc_remap_buffer(dev, size, gfp, prot, ret, c) NULL
> #define __alloc_from_pool(size, ret_page) NULL
> #define __alloc_from_contiguous(dev, size, prot, ret, c) NULL
> #define __free_from_pool(cpu_addr, size) 0
> +#define __in_atomic_pool(start, size) 0
> #define __free_from_contiguous(dev, page, cpu_addr, size) do { } while (0)
> #define __dma_free_remap(cpu_addr, size) do { } while (0)
>

Best regards
--
Marek Szyprowski, PhD
Samsung R&D Institute Poland



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