[PATCH 06/65] powerpc/cxl: Use REGION_ID instead of opencoding

[Ian Munsie]

Copying in Andrew Donnellan - this looks to be roughly equivalent to
your patch:

[PATCH] cxl: fix setting of _PAGE_USER bit when handling page faults

I think we were waiting on a v2 of that patch - does the below replace
the need for that?

Also copying cxlflash folk as an FYI

Acked-by: Ian Munsie <imunsie at au1.ibm.com>

Excerpts from Aneesh Kumar K.V's message of 2016-03-27 03:23:14 -0500:
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
> ---
>  drivers/misc/cxl/fault.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
> index 33bd0ee30edd..67cc657e96cc 100644
> --- a/drivers/misc/cxl/fault.c
> +++ b/drivers/misc/cxl/fault.c
> @@ -154,7 +154,7 @@ static void cxl_handle_page_fault(struct cxl_context *ctx,
>          access |= _PAGE_WRITE;
>  
>      access |= _PAGE_PRIVILEGED;
> -    if ((!ctx->kernel) || ~(dar & (1ULL << 63)))
> +    if ((!ctx->kernel) || (REGION_ID(dar) == USER_REGION_ID))
>          access &= ~_PAGE_PRIVILEGED;
>  
>      if (dsisr & DSISR_NOHPTE)