MIPS: Fix CONFIG_FLATMEM version of pfn_valid()

For systems which do not define PHYS_OFFSET as 0 pfn_valid() may falsely
have returned 0 on most configurations.  Bug introduced by commit
752fbeb2e3555c0d236e992f1195fd7ce30e728d (linux-mips.org) rsp.
6f284a2ce7b8bc49cb8455b1763357897a899abb (kernel.org) titled "[MIPS]
FLATMEM: introduce PHYS_OFFSET."

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

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h
index dc0eaa731281..96a14a426a7c 100644
--- a/arch/mips/include/asm/page.h
+++ b/arch/mips/include/asm/page.h
@@ -165,7 +165,14 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 
 #ifdef CONFIG_FLATMEM
 
-#define pfn_valid(pfn)          ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
+#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;                      \
+})
 
 #elif defined(CONFIG_SPARSEMEM)