[PATCH 3/3] mm, arch: add generic implementation of pfn_valid() for FLATMEM

[Stafford Horne]

On Wed, Jan 25, 2023 at 09:07:57PM +0200, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt at kernel.org>
> 
> Every architecture that supports FLATMEM memory model defines its own
> version of pfn_valid() that essentially compares a pfn to max_mapnr.
> 
> Use mips/powerpc version implemented as static inline as a generic
> implementation of pfn_valid() and drop its per-architecture definitions
> 
> Signed-off-by: Mike Rapoport (IBM) <rppt at kernel.org>
> ---
>  arch/alpha/include/asm/page.h      |  4 ----
>  arch/arc/include/asm/page.h        |  1 -
>  arch/csky/include/asm/page.h       |  1 -
>  arch/hexagon/include/asm/page.h    |  1 -
>  arch/ia64/include/asm/page.h       |  4 ----
>  arch/loongarch/include/asm/page.h  | 13 -------------
>  arch/m68k/include/asm/page_no.h    |  2 --
>  arch/microblaze/include/asm/page.h |  1 -
>  arch/mips/include/asm/page.h       | 13 -------------
>  arch/nios2/include/asm/page.h      |  9 ---------
>  arch/openrisc/include/asm/page.h   |  2 --
>  arch/parisc/include/asm/page.h     |  4 ----
>  arch/powerpc/include/asm/page.h    |  9 ---------
>  arch/riscv/include/asm/page.h      |  5 -----
>  arch/sh/include/asm/page.h         |  3 ---
>  arch/sparc/include/asm/page_32.h   |  1 -
>  arch/um/include/asm/page.h         |  1 -
>  arch/x86/include/asm/page_32.h     |  4 ----
>  arch/x86/include/asm/page_64.h     |  4 ----
>  arch/xtensa/include/asm/page.h     |  2 --
>  include/asm-generic/memory_model.h | 12 ++++++++++++
>  include/asm-generic/page.h         |  2 --
>  22 files changed, 12 insertions(+), 86 deletions(-)
> 
[...] 
> diff --git a/arch/openrisc/include/asm/page.h b/arch/openrisc/include/asm/page.h
> index aab6e64d6db4..52b0d7e76446 100644
> --- a/arch/openrisc/include/asm/page.h
> +++ b/arch/openrisc/include/asm/page.h
> @@ -80,8 +80,6 @@ typedef struct page *pgtable_t;
>  
>  #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
>  
> -#define pfn_valid(pfn)          ((pfn) < max_mapnr)
> -
>  #define virt_addr_valid(kaddr)	(pfn_valid(virt_to_pfn(kaddr)))
>  
>  #endif /* __ASSEMBLY__ */

For OpenRISC

Acked-by: Stafford Horne <shorne at gmail.com>