[PATCH 00/34] Convert DRM to XArray

[Matthew Wilcox]

On Fri, Feb 22, 2019 at 10:54:21AM +0100, Daniel Vetter wrote:
> >  - idr_alloc() returned -ENOSPC, radix_tree_insert() returned -EEXIST.
> >    xa_insert() and xa_alloc() return -EBUSY.
> 
> I think this will upset a few of our tests. Just written some more for
> drm-lease at least, and those check for the ENOSPC. Not sure yet what to
> do.

If there's real userspace (not just a test suite) which actually relies
on the exact errno returned, we can change the places which currently
just return the errno to something like:

	if (err == -EBUSY)
		return -ENOSPC;
	return err;

There are actually a number of places in the kernel which do the opposite
translation today, presumably because having a program print out "No
space left on device" was confusing.

If it's only the test-suite which cares, presumably the test suite can
be changed to treat EBUSY and ENOSPC as being equivalent errno values
for a given test.

> I did at least read the above, I'll leave all the driver patches for
> others. At least for now, any leftovers can be smashed into drm-misc.

Thanks!  I'll resend after -rc1.