Re: [PATCH v2 1/6] mm: Introduce common STRUCT_PAGE_MAX_SHIFT define

[Will Deacon]

Hi Logan,

On Mon, Oct 15, 2018 at 11:56:57AM -0600, Logan Gunthorpe wrote:
> This define is used by arm64 to calculate the size of the vmemmap
> region. It is defined as the log2 of the upper bound on the size
> of a struct page.
> 
> We move it into mm_types.h so it can be defined properly instead of
> set and checked with a build bug. This also allows us to use the same
> define for riscv.
> 
> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will.deacon@xxxxxxx>
> Cc: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Christoph Hellwig <hch@xxxxxx>
> ---
>  arch/arm64/include/asm/memory.h | 9 ---------
>  arch/arm64/mm/init.c            | 8 --------
>  include/asm-generic/fixmap.h    | 1 +
>  include/linux/mm_types.h        | 5 +++++
>  4 files changed, 6 insertions(+), 17 deletions(-)

This looks like a really good cleanup to me, thanks:

Acked-by: Will Deacon <will.deacon@xxxxxxx>

Will