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

[Ian Munsie]

Excerpts from andrew.donnellan's message of 2016-03-18 15:01:21 +1100:
> Fixes: f204e0b8cedd ("cxl: Driver code for powernv PCIe based cards for
> userspace access")

It doesn't fix that since there was no cxl kernel API support at the
time, so this wasn't a regression - just something we missed when the
kernel api was added (I believe the broken test in the code was a left
over from some early bringup work and would never have been exercised on
an upstream kernel until then).

> Currently, this should only affect cxlflash.

We haven't run into any problems because of this that I am aware of - do
we have a test case for this?

> -    if ((!ctx->kernel) || ~(dar & (1ULL << 63)))
> +    if ((!ctx->kernel) || !(dar & (1ULL << 63)))

Should it be the top two bits?

-Ian