[PATCH 2/2] x86: remove high_memory check from valid_phys_addr_range

[Frantisek Hrbata]

There is no need to block read/write access to /dev/mem for phys. addr. above
high_memory for non-system RAM. The only limitation should be
boot_cpu_data.x86_phys_bits(max phys. addr. size).

Signed-off-by: Frantisek Hrbata <fhrbata@xxxxxxxxxx>
---
 arch/x86/mm/mmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index 110473e..16f222d 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -127,7 +127,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
 
 int valid_phys_addr_range(phys_addr_t addr, size_t count)
 {
-	return addr + count <= __pa(high_memory);
+	return arch_pfn_possible((addr + count) >> PAGE_SHIFT);
 }
 
 int valid_mmap_phys_addr_range(unsigned long pfn, size_t count)
-- 
1.9.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/