linux-kernel - [PATCH 1/2] m68k/nommu: add missing definition of ARCH_PFN

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Date:   Tue, 14 Feb 2023 16:07:28 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Greg Ungerer <gerg@...ux-m68k.org>,
        Guenter Roeck <linux@...ck-us.net>,
        "Mike Rapoport (IBM)" <rppt@...nel.org>,
        Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-kernel@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mm@...ck.org, linux-sh@...r.kernel.org
Subject: [PATCH 1/2] m68k/nommu: add missing definition of ARCH_PFN_OFFSET

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