+ m68k-make-__pfn_to_phys-and-__phys_to_pfn-available-for-mmu.patch added to -mm tree

+ m68k-make-__pfn_to_phys-and-__phys_to_pfn-available-for-mmu.patch added to -mm tree

[akpm]

The patch titled
     Subject: m68k: make __pfn_to_phys() and __phys_to_pfn() available for !MMU
has been added to the -mm tree.  Its filename is
     m68k-make-__pfn_to_phys-and-__phys_to_pfn-available-for-mmu.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/m68k-make-__pfn_to_phys-and-__phys_to_pfn-available-for-mmu.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/m68k-make-__pfn_to_phys-and-__phys_to_pfn-available-for-mmu.patch

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------------------------------------------------------
From: Mike Rapoport <rppt@linux.ibm.com>
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@linux.ibm.com
Fixes: 4bfc848e0981 ("m68k/mm: enable use of generic memory_model.h for !DISCONTIGMEM")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Reported-by: kernel test robot <lkp@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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
_

Patches currently in -mm which might be from rppt@linux.ibm.com are

m68k-make-__pfn_to_phys-and-__phys_to_pfn-available-for-mmu.patch
mm-refactor-initialization-of-struct-page-for-holes-in-memory-layout.patch