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

Mike Rapoport
2023-02-14T14:09:31Z

From: "Mike Rapoport (IBM)" <rppt@kernel.org>

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@roeck-us.net>
Fixes: d82f07f06cf8 ("m68k: use asm-generic/memory_model.h for both MMU and !MMU")
Signed-off-by: Mike Rapoport (IBM) <rppt@kernel.org>
---
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 */
--
2.35.1