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MIPS: Rewrite pfn_valid to work in modules, too.

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Upstream commit 8b9232141b.

This fixes:

  MODPOST 393 modules
ERROR: "min_low_pfn" [arch/mips/kvm/kvm.ko] undefined!
make[3]: *** [__modpost] Error 1

It would have been possible to just export min_low_pfn but in the end
pfn_valid should return 1 for any pfn argument for which a struct page
exists so using min_low_pfn was wrong anyway.

[Backport to 3.4 kernel. Applies cleanly on top of current 3.4 patch queue,
and fixes "make ARCH=mips allmodconfig; make ARCH=mips" build problem. - Guenter]

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ralf Baechle 2013-08-15 22:35:53 -07:00 committed by Greg Kroah-Hartman
parent 22a327d168
commit 938b7f3cfa
1 changed files with 9 additions and 8 deletions
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17
arch/mips/include/asm/page.h
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@ -175,14 +175,15 @@ typedef struct { unsigned long pgprot; } pgprot_t;
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn) \
({ \
unsigned long __pfn = (pfn); \
/* avoid <linux/bootmem.h> include hell */ \
extern unsigned long min_low_pfn; \
\
__pfn >= min_low_pfn && __pfn < max_mapnr; \
})
#ifndef __ASSEMBLY__
static inline int pfn_valid(unsigned long pfn)
{
/* avoid <linux/mm.h> include hell */
extern unsigned long max_mapnr;
return pfn >= ARCH_PFN_OFFSET && pfn < max_mapnr;
}
#endif
#elif defined(CONFIG_SPARSEMEM)