On Fri, 2015-20-02 at 08:35:44 UTC, Benjamin Herrenschmidt wrote:
> We don't initialize it, we don't use it, remove it.
>
> We can bring it back if we ever wish to have support for devices
> who have smaller than 32-bit DMA limitations but I don't think
> we care much anymore.
>
> Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> ---
> arch/powerpc/Kconfig | 2 +-
> arch/powerpc/kernel/dma.c | 10 +---------
> 2 files changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 22b0940..4efbfba 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -712,7 +712,7 @@ config ISA
>
> config ZONE_DMA
> bool
> - default y
> + default n
>
> config NEED_DMA_MAP_STATE
> def_bool (PPC64 || NOT_COHERENT_CACHE)
> diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
> index e24e0ae..6306d4e 100644
> --- a/arch/powerpc/kernel/dma.c
> +++ b/arch/powerpc/kernel/dma.c
> @@ -63,16 +63,8 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t
> size,
> return NULL;
> }
>
> - switch (zone) {
> - case ZONE_DMA:
> - flag |= GFP_DMA;
> - break;
> -#ifdef CONFIG_ZONE_DMA32
> - case ZONE_DMA32:
> + if (zone == ZONE_DMA32)
> flag |= GFP_DMA32;
> - break;
> -#endif
> - };
You still need the ifdef, else eg. ppc6xx_defconfig:
arch/powerpc/kernel/dma.c:66:14: error: 'ZONE_DMA32' undeclared (first use in
this function)
cheers
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