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fixed generic page.h for non-zero PAGE_OFFSET
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asm-generic/page.h had several problems when used with a non-zero PAGE_OFFSET.
This patch adds a default ARCH_PFN_OFFSET and fixes the __va, __pa, and
pfn_valid macros to work with non-zero PAGE_OFFSETs.

Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
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Mark Salter committed Oct 6, 2011
1 parent 830f580 commit b7a0556
Showing 1 changed file with 7 additions and 3 deletions.
10 changes: 7 additions & 3 deletions include/asm-generic/page.h
Original file line number Diff line number Diff line change
Expand Up @@ -71,10 +71,14 @@ extern unsigned long memory_end;
#define PAGE_OFFSET (0)
#endif

#ifndef ARCH_PFN_OFFSET
#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
#endif

#ifndef __ASSEMBLY__

#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x)))
#define __pa(x) ((unsigned long) (x))

#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
Expand All @@ -86,7 +90,7 @@ extern unsigned long memory_end;
#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
#endif

#define pfn_valid(pfn) ((pfn) < max_mapnr)
#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)

#define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
((void *)(kaddr) < (void *)memory_end))
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