[PATCH 0/3] Fix build failure with v5.8-rc1

[Will Deacon]

[+Arnd in case he's interested in this series]

On Mon, Jun 15, 2020 at 12:57:55PM +0000, Christophe Leroy wrote:
> Commit 2ab3a0a02905 ("READ_ONCE: Enforce atomicity for
> {READ,WRITE}_ONCE() memory accesses") leads to following build
> failure on powerpc 8xx.
> 
> To fix it, this small series introduces a new helper named ptep_get()
> to replace the direct access with READ_ONCE(). This new helper
> can be overriden by architectures.

Thanks for doing this, and sorry for the breakage. For the series:

Acked-by: Will Deacon <will at kernel.org>

Hopefully we can introduce accessors for the other page-table levels too,
but that can obviously happen incrementally.

Will

> Christophe Leroy (3):
>   mm/gup: Use huge_ptep_get() in gup_hugepte()
>   mm: Allow arches to provide ptep_get()
>   powerpc/8xx: Provide ptep_get() with 16k pages
> 
>  arch/powerpc/include/asm/nohash/32/pgtable.h | 10 ++++++++++
>  include/asm-generic/hugetlb.h                |  2 +-
>  include/linux/pgtable.h                      |  7 +++++++
>  mm/gup.c                                     |  4 ++--
>  4 files changed, 20 insertions(+), 3 deletions(-)
> 
> -- 
> 2.25.0
>