Re: [PATCH] mm/nvdimm: Add is_ioremap_addr and use that to check ioremap address

Andrew Morton [off-list ref] writes:

On Mon,  1 Jul 2019 19:10:38 +0530 "Aneesh Kumar K.V" [off-list ref] wrote:

quoted

Architectures like powerpc use different address range to map ioremap
and vmalloc range. The memunmap() check used by the nvdimm layer was
wrongly using is_vmalloc_addr() to check for ioremap range which fails for
ppc64. This result in ppc64 not freeing the ioremap mapping. The side effect
of this is an unbind failure during module unload with papr_scm nvdimm driver

The patch applies to 5.1.  Does it need a Fixes: and a Cc:stable?

Actually, we want it to be backported to an older kernel possibly one
that added papr-scm driver, b5beae5e224f ("powerpc/pseries: Add driver
for PAPR SCM regions"). But that doesn't apply easily. It does apply
without conflicts to 5.0

-aneesh