On CONFIG_64BIT_PHYS_ADDR, pfn always fits in 'unsigned long', but

pfn<<PAGE_SHIFT sometimes extends beyond.  The pte is big enough to hold
'long long', but the shift in pfn_pte() needs to do its calculation with
enough bits to hold the result.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

include/asm-mips/pgtable-32.h

@@ -137,7 +137,7 @@ pfn_pte(unsigned long pfn, pgprot_t prot)
 #define pfn_pte(pfn, prot)	__pte(((pfn) << (PAGE_SHIFT + 2)) | pgprot_val(prot))
 #else
 #define pte_pfn(x)		((unsigned long)((x).pte >> PAGE_SHIFT))
-#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
+#define pfn_pte(pfn, prot)	__pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
 #endif
 #endif /* defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1) */