[PATCH 1/2] mm/vmalloc: Export purge_vmap_area_lazy()

[Nick Piggin]

On Wed, Mar 24, 2010 at 06:56:31PM +1100, Benjamin Herrenschmidt wrote:
> Some powerpc code needs to ensure that all previous iounmap/vunmap has
> really been flushed out of the MMU hash table. Without that, various
> hotplug operations may fail when trying to return those pieces to
> the hypervisor due to existing active mappings.
> 
> This exports purge_vmap_area_lazy() to allow the powerpc code to perform
> that purge when unplugging devices.

You want vm_unmap_aliases(), which also flushes entries in the
per-cpu vmap allocator (and is already exported for other code
that has similar problems).

Thanks,
Nick