MIPS: Rewrite pfn_valid to work in modules, too.

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.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 7 insertions, 8 deletions

diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index ec1ca537fbc1..f59552fae917 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -171,14 +171,13 @@ 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;                      \
-})
+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;
+}
 
 #elif defined(CONFIG_SPARSEMEM)