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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2009-09-07 18:06:42 +0400 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-12 14:48:09 +0400 |
| commit | b7cfda9fc3d7aa60cffab5367f2a72a4a70060cd (patch) | |
| tree | a52c6cdbbc7973a4904ec499a607732832e4ca38 /arch/arm/include/asm/page.h | |
| parent | 5eb38f44839ec1aade167b125d86d265c886c195 (diff) | |
| download | linux-b7cfda9fc3d7aa60cffab5367f2a72a4a70060cd.tar.xz | |
ARM: Fix pfn_valid() for sparse memory
On OMAP platforms, some people want to declare to segment up the memory
between the kernel and a separate application such that there is a hole
in the middle of the memory as far as Linux is concerned. However,
they want to be able to mmap() the hole.
This currently causes problems, because update_mmu_cache() thinks that
there are valid struct pages for the "hole". Fix this by making
pfn_valid() slightly more expensive, by checking whether the PFN is
contained within the meminfo array.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Khasim Syed Mohammed <khasim@ti.com>
Diffstat (limited to 'arch/arm/include/asm/page.h')
| -rw-r--r-- | arch/arm/include/asm/page.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/include/asm/page.h b/arch/arm/include/asm/page.h index 9c746af1bf6e..3a32af4cce30 100644 --- a/arch/arm/include/asm/page.h +++ b/arch/arm/include/asm/page.h @@ -194,6 +194,10 @@ typedef unsigned long pgprot_t; typedef struct page *pgtable_t; +#ifndef CONFIG_SPARSEMEM +extern int pfn_valid(unsigned long); +#endif + #include <asm/memory.h> #endif /* !__ASSEMBLY__ */ |