The patch titled
Subject: m68k/nommu: add missing definition of ARCH_PFN_OFFSET
has been added to the -mm mm-unstable branch. Its filename is
m68k-nommu-add-missing-definition-of-arch_pfn_offset.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/m68k-nommu-add-missing-definition-of-arch_pfn_offset.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Subject: m68k/nommu: add missing definition of ARCH_PFN_OFFSET
Date: Tue, 14 Feb 2023 16:07:28 +0200
Patch series "fixups for generic implementation of pfn_valid()".
Guenter reported boot failures on m68k-nommu and sh caused by the switch to
the generic implementation of pfn_valid():
https://lore.kernel.org/all/20230212173513.GA4052259@xxxxxxxxxxxx
https://lore.kernel.org/all/20230212161320.GA3784076@xxxxxxxxxxxx
These are small fixups that address the issues.
This patch (of 2):
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.
Link: https://lkml.kernel.org/r/20230214140729.1649961-1-rppt@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20230214140729.1649961-2-rppt@xxxxxxxxxx
Fixes: d82f07f06cf8 ("m68k: use asm-generic/memory_model.h for both MMU and !MMU")
Reported-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Mike Rapoport (IBM) <rppt@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Greg Ungerer <gerg@xxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: John Paul Adrian Glaubitz <glaubitz@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/arch/m68k/include/asm/page_no.h~m68k-nommu-add-missing-definition-of-arch_pfn_offset
+++ a/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 */
_
Patches currently in -mm which might be from rppt@xxxxxxxxxx are
m68k-nommu-add-missing-definition-of-arch_pfn_offset.patch
sh-initialize-max_mapnr.patch
