[ARM] Convert pmd_page() to be highmem safe
In the long run, we may want to place page tables in highmem. However,
pmd_page() has traditionally been coded to convert the physical address
to a virtual one, which won't work with highmem pages. Instead,
translate the physical address to a PFN, and then convert the PFN to a
struct page instead.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 110295c..1cd2d64 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -342,7 +342,7 @@
return __va(ptr);
}
-#define pmd_page(pmd) virt_to_page(__va(pmd_val(pmd)))
+#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd)))
/*
* Conversion functions: convert a page and protection to a page entry,