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

[Michael Ellerman]

"Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> writes:
> Andrew Morton <akpm at linux-foundation.org> writes:
>
>> On Mon,  1 Jul 2019 19:10:38 +0530 "Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> wrote:
>>
>>> 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

Don't worry about where it applies or doesn't, just tag it with the
correct Fixes: and stable versions and then if it doesn't backport
cleanly then we deal with that later.

cheers