Messages in this thread Patch in this message | | | From | Frantisek Hrbata <> | Subject | [PATCH 2/2] x86: remove high_memory check from valid_phys_addr_range | Date | Wed, 20 Aug 2014 17:25:26 +0200 |
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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@redhat.com> --- 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
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