[PATCH 1/3] x86/pat: export io memory reserve/free api.

[Shawn Starr]

For the series, no regressions in my testing, no stalls, no issues noted.

Tested by: Shawn Starr <shawn.starr at rogers.com>

Thanks,
Shawn

On Tuesday, October 18, 2016 4:13:11 PM EDT Dave Airlie wrote:
> From: Dave Airlie <airlied at redhat.com>
> 
> These functions are needed for gpu/ttm drivers to reserve the
> VRAM area as write combined. In a lot of places we don't ioremap
> but still need to insert pfn from it into a VMA using vm_insert_mixed,
> but a recent change in mixed insertion means we need to reserve
> VRAM as WC upfront, so we need these APIs exported.
> 
> Signed-off-by: Dave Airlie <airlied at redhat.com>
> ---
>  arch/x86/mm/pat.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
> index 170cc4f..5ce2fbb 100644
> --- a/arch/x86/mm/pat.c
> +++ b/arch/x86/mm/pat.c
> @@ -719,6 +719,7 @@ out_free:
>  out_err:
>  	return ret;
>  }
> +EXPORT_SYMBOL(io_reserve_memtype);
> 
>  /**
>   * io_free_memtype - Release a memory type mapping for a region of memory
> @@ -729,6 +730,7 @@ void io_free_memtype(resource_size_t start,
> resource_size_t end) {
>  	free_memtype(start, end);
>  }
> +EXPORT_SYMBOL(io_free_memtype);
> 
>  pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
>  				unsigned long size, pgprot_t vma_prot)