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 c8acb10..7fa0242 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
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