Re: [PATCH 1/2] m68k/nommu: add missing definition of ARCH_PFN_OFFSET

[Greg Ungerer]

On 15/2/23 00:07, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
>
> On m68k/nommu RAM does not necessarily start at 0x0 and when it does not
> pfn_valid() uses a wrong offset into the memory map which causes silent
> boot failures.
>
> Define ARCH_PFN_OFFSET to make pfn_valid() use the correct offset.
>
> Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
> Fixes: d82f07f06cf8 ("m68k: use asm-generic/memory_model.h for both MMU and !MMU")
> Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>

Acked-by: Greg Ungerer <gerg@xxxxxxxxxxxxxx>


> ---
>   arch/m68k/include/asm/page_no.h | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/arch/m68k/include/asm/page_no.h b/arch/m68k/include/asm/page_no.h
> index 43ff6b109ebb..060e4c0e7605 100644
> --- a/arch/m68k/include/asm/page_no.h
> +++ b/arch/m68k/include/asm/page_no.h
> @@ -28,6 +28,8 @@ extern unsigned long memory_end;
>   #define	virt_addr_valid(kaddr)	(((unsigned long)(kaddr) >= PAGE_OFFSET) && \
>   				((unsigned long)(kaddr) < memory_end))
>   
> +#define ARCH_PFN_OFFSET PHYS_PFN(PAGE_OFFSET_RAW)
> +
>   #endif /* __ASSEMBLY__ */
>   
>   #endif /* _M68K_PAGE_NO_H */