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authorMark Rutland <mark.rutland@arm.com>2011-08-30 17:45:10 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2011-09-04 10:50:03 +0100
commitfb492c9160f3d40d09456a79cc669fba74d7d9cc (patch)
treeddccd8f32734a46e84ee08a4b905c9855a95582f /arch
parent9e79e3e9dd9672b37ac9412e9a926714306551fe (diff)
downloadlinux-fb492c9160f3d40d09456a79cc669fba74d7d9cc.tar.bz2
ARM: 7067/1: mm: keep significant bits in pfn_valid
When ARCH_HAS_HOLES_MEMORYMODEL is selected, pfn_valid calls memblock_is_memory to test validity of a pfn: > memblock_is_memory(pfn << PAGE_SHIFT); On LPAE systems this cuts off the top bits, as the shift occurs before the value is promoted to a phys_addr_t. This patch replaces the shift with a call to __pfn_to_phys (which casts pfn to phys_addr_t before shifting), preventing the loss of significant bits. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mm/init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 91bca355cd31..cc7e2d8be9aa 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -298,7 +298,7 @@ static void __init arm_bootmem_free(unsigned long min, unsigned long max_low,
#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
- return memblock_is_memory(pfn << PAGE_SHIFT);
+ return memblock_is_memory(__pfn_to_phys(pfn));
}
EXPORT_SYMBOL(pfn_valid);
#endif