x86: introduce max_low_pfn_mapped for 64-bit
when more than 4g memory is installed, don't map the big hole below 4g.
Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 6ccd7a1..5281e34 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -334,7 +334,9 @@
flags = new_flags;
}
- if (vma->vm_pgoff <= max_pfn_mapped &&
+ if (((vma->vm_pgoff <= max_low_pfn_mapped) ||
+ (vma->vm_pgoff >= (1UL<<(32 - PAGE_SHIFT)) &&
+ vma->vm_pgoff <= max_pfn_mapped)) &&
ioremap_change_attr((unsigned long)__va(addr), len, flags)) {
free_memtype(addr, addr + len);
return -EINVAL;