cleanup vfree and vunmap

[Christoph Hellwig <hch@xxxxxx>]

Hi all,

this little series untangles the vfree and vunmap code path a bit.

For the KASAN maintainers:  the interesting patch re KASAN is patch 8.

Note that it depends on 'Revert "remoteproc: qcom_q6v5_mss: map/unmap metadata
region before/after use"' in linux-next.

Changes since v1:
 - drop an extra WARN_ON

Diffstat:
 vmalloc.c |  304 +++++++++++++++++++++++++++-----------------------------------
 1 file changed, 134 insertions(+), 169 deletions(-)