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.
6f284a2c (kernel.org) titled "[MIPS]
FLATMEM: introduce PHYS_OFFSET."

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

parent 01a6221a

arch/mips/include/asm/page.h

+8 −1

Original line number	Diff line number	Diff line
		@@ -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)