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MIPS: Fix CONFIG_FLATMEM version of pfn_valid()
author
Ralf Baechle
<ralf@linux-mips.org>
Fri, 3 Jul 2009 06:11:15 +0000
(07:11 +0100)
committer
Ralf Baechle
<ralf@linux-mips.org>
Fri, 3 Jul 2009 14:45:29 +0000
(15:45 +0100)
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>
arch/mips/include/asm/page.h
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diff --git
a/arch/mips/include/asm/page.h
b/arch/mips/include/asm/page.h
index
dc0eaa7
..
96a14a4
100644
(file)
--- 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)