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MIPS: Fix CONFIG_FLATMEM version of pfn_valid()

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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.
6f284a2ce7 (kernel.org) titled "[MIPS]
FLATMEM: introduce PHYS_OFFSET."

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2009-07-03 07:11:15 +01:00
parent 01a6221a6a
commit baf9227802
1 changed files with 8 additions and 1 deletions
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9
arch/mips/include/asm/page.h
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@ -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)