From: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Subject: m68k: make __pfn_to_phys() and __phys_to_pfn() available for !MMU
Recent changes that obsoleted DISCONTIGMEM on m68k switched the MMU
variant to use generic definitions of __pfn_to_phys() and __phys_to_pfn(),
but missed the !MMU variant which caused a build failure:
All errors (new ones prefixed by >>):
drivers/media/common/videobuf2/videobuf2-dma-contig.c: In function 'vb2_dc_get_userptr':
>> drivers/media/common/videobuf2/videobuf2-dma-contig.c:509:5: error: implicit declaration of function '__pfn_to_phys' [-Werror=implicit-function-declaration]
509 | __pfn_to_phys(nums[0]), size, buf->dma_dir, 0);
| ^~~~~~~~~~~~~
cc1: some warnings being treated as errors
Enable __pfn_to_phys() and __phys_to_pfn() on !MMU builds.
Link: https://lkml.kernel.org/r/20210211232202.GS299309@xxxxxxxxxxxxx
Fixes: 4bfc848e0981 ("m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM")
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Cc: Greg Ungerer <gerg@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/m68k/include/asm/page.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/m68k/include/asm/page.h~m68k-make-__pfn_to_phys-and-__phys_to_pfn-available-for-mmu
+++ a/arch/m68k/include/asm/page.h
@@ -62,7 +62,7 @@ extern unsigned long _ramend;
#include <asm/page_no.h>
#endif
-#ifdef CONFIG_DISCONTIGMEM
+#if !defined(CONFIG_MMU) || defined(CONFIG_DISCONTIGMEM)
#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
#define __pfn_to_phys(pfn) PFN_PHYS(pfn)
#endif
_
