Allow cacheable mmaps of legacy_mem if WB access is supported for the region.
The "legacy_mem" file often contains a shadow option ROM, and some versions of
X depend on this.
Tim Yamin <[EMAIL PROTECTED]> reported that this change fixes X on a Dell
PowerEdge 3250.
Signed-off-by: Bjorn Helgaas <[EMAIL PROTECTED]>
Index: work-mm10/arch/ia64/pci/pci.c
===================================================================
--- work-mm10.orig/arch/ia64/pci/pci.c 2007-03-21 14:13:22.000000000 -0700
+++ work-mm10/arch/ia64/pci/pci.c 2007-03-21 14:15:01.000000000 -0700
@@ -656,8 +656,6 @@
return -EINVAL;
prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
vma->vm_page_prot);
- if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot)))
- return -EINVAL;
addr = pci_get_legacy_mem(bus);
if (IS_ERR(addr))
-
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