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| author | Mark Rutland <mark.rutland@arm.com> | 2011-08-30 18:45:10 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-09-04 11:50:03 +0200 |
| commit | fb492c9160f3d40d09456a79cc669fba74d7d9cc (patch) | |
| tree | ddccd8f32734a46e84ee08a4b905c9855a95582f | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc (diff) | |
| download | linux-fb492c9160f3d40d09456a79cc669fba74d7d9cc.tar.xz linux-fb492c9160f3d40d09456a79cc669fba74d7d9cc.zip | |
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>
| -rw-r--r-- | arch/arm/mm/init.c | 2 |
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 |