[PATCH v14 0/4] KASAN core changes for ppc64 radix KASAN

Building on the work of Christophe, Aneesh and Balbir, I've ported
KASAN to 64-bit Book3S kernels running on the Radix MMU. I've been
trying this for a while, but we keep having collisions between the
kasan code in the mm tree and the code I want to put in to the ppc
tree.

This series just contains the kasan core changes that we need. These
can go in via the mm tree. I will then propose the powerpc changes for
a later cycle. (The most recent RFC for the powerpc changes is in the
v12 series at
https://lore.kernel.org/linux-mm/20210615014705.2234866-1-dja@axtens.net/ (local)
)

v14 applies to next-20210611. There should be no noticeable changes to
other platforms.

Changes since v13: move the MAX_PTR_PER_* definitions out of kasan and
into pgtable.h. Add a build time error to hopefully prevent any
confusion about when the new hook is applicable. Thanks Marco and
Christophe.

Changes since v12: respond to Marco's review comments - clean up the
help for ARCH_DISABLE_KASAN_INLINE, and add an arch readiness check to
the new granule poisioning function. Thanks Marco.

Daniel Axtens (4):
  kasan: allow an architecture to disable inline instrumentation
  kasan: allow architectures to provide an outline readiness check
  mm: define default MAX_PTRS_PER_* in include/pgtable.h
  kasan: use MAX_PTRS_PER_* for early shadow tables