On Thu, Apr 09, 2020 at 09:08:26AM -0700, Minchan Kim wrote:

On Wed, Apr 08, 2020 at 01:59:08PM +0200, Christoph Hellwig wrote:

quoted

This allows to unexport map_vm_area and unmap_kernel_range, which are
rather deep internal and should not be available to modules.

Even though I don't know how many usecase we have using zsmalloc as
module(I heard only once by dumb reason), it could affect existing
users. Thus, please include concrete explanation in the patch to
justify when the complain occurs.

The justification is 'we can unexport functions that have no sane reason
of being exported in the first place'.

The Changelog pretty much says that.