This patch removes an invalid optimization that works great if you are a kernel address (which is contiguous), but if you are module then you have a kernel address but you are not contiguous. So this check is invalid.
diff -r bbf2db4ddf54 arch/powerpc/platforms/xen/xencomm.c --- a/arch/powerpc/platforms/xen/xencomm.c Tue Dec 19 09:22:37 2006 -0500 +++ b/arch/powerpc/platforms/xen/xencomm.c Tue Jan 09 14:50:55 2007 -0600 @@ -36,9 +36,6 @@ unsigned long xencomm_vtop(unsigned long if (vaddr == 0) return 0; - if (is_kernel_addr(vaddr)) - return __pa(vaddr); - /* XXX double-check (lack of) locking */ vma = find_extend_vma(current->mm, vaddr); BUG_ON(!vma);
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