[Intel-gfx] [PATCH 2/2] drm/i915: Use remap_io_mapping() to prefault all PTE in a single pass

[Chris Wilson]

On Fri, Aug 19, 2016 at 02:32:05PM +0300, Joonas Lahtinen wrote:
> On ma, 2016-08-15 at 12:53 +0100, Chris Wilson wrote:
> > +int remap_io_mapping(struct vm_area_struct *vma,
> > +		     unsigned long addr, unsigned long pfn, unsigned long size,
> > +		     struct io_mapping *iomap)
> > +{
> > +	struct remap_pfn r;
> > +	int err;
> > +
> > +#define MUST_SET (VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP)
> > +	if (WARN_ON((vma->vm_flags & MUST_SET) != MUST_SET))
> > +		return -EINVAL;
> > +#undef MUST_SET
> 
> #define is bit overkill...

Yeah, it was mostly to fit it onto one line. Since this is private we
can just go with GEM_BUG_ON()
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre