[Intel-gfx] [PATCH v5 4/5] drm: Add library for shmem backed GEM objects

[Eric Anholt]

Daniel Vetter <daniel at ffwll.ch> writes:

> On Mon, Nov 26, 2018 at 04:36:21PM -0800, Eric Anholt wrote:
>> Noralf Trønnes <noralf at tronnes.org> writes:
>> > +static void drm_gem_shmem_vm_close(struct vm_area_struct *vma)
>> > +{
>> > +	struct drm_gem_object *obj = vma->vm_private_data;
>> > +	struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
>> > +
>> > +	drm_gem_shmem_put_pages(shmem);
>> > +	drm_gem_vm_close(vma);
>> > +}
>> > +
>> > +const struct vm_operations_struct drm_gem_shmem_vm_ops = {
>> > +	.fault = drm_gem_shmem_fault,
>> > +	.open = drm_gem_vm_open,
>> > +	.close = drm_gem_shmem_vm_close,
>> > +};
>> > +EXPORT_SYMBOL_GPL(drm_gem_shmem_vm_ops);
>> 
>> I just saw a warning from drm_gem_shmem_put_pages() for
>> !shmem->pages_use_count -- I think drm_gem_vm_open() needs to
>> drm_gem_shmem_get_pages().
>
> Yeah we need a drm_gem_shmem_vm_open here.

Adding one of those fixed my refcounting issues, so I've sent out a v6
with it.
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