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In 2.6.17 sparc64 kernels, X11 runs _extremely_ slowly with
frequent lock-up like behaviour on my Ultra5 (ATI Mach64).

I finally managed to trace the cause to this change in 2.6.16-git6:

  -  Mikael Pettersson <mikpe@it.uu.se>

Confirmed to fix ATi@U5 and Creator@U30.

  - Rene Rebe <rene@exactcode.de>

--- a/arch/sparc64/mm/generic.c
+++ b/arch/sparc64/mm/generic.c
@@ -140,6 +144,7 @@ int io_remap_pfn_range(struct vm_area_st
 	vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP;
 	vma->vm_pgoff = phys_base >> PAGE_SHIFT;
 
+	prot = __pgprot(pg_iobits);
 	offset -= from;
 	dir = pgd_offset(mm, from);
 	flush_cache_range(vma, beg, end);