[Xen-changelog] Fix vmalloc_fault() path for x86/64 XenLinux.

[Xen patchbot -unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID c63e764da7851205fbbfd3ffe5a10454e25e8bdc
# Parent  7bd1a40ae2bd1895190f7df580afb7ea8426eb50
Fix vmalloc_fault() path for x86/64 XenLinux.
There may be a deeper underlying problem w.r.t pagetable
initialisation at start of day, but this simple fix is
a good workaround until we have time to investigate
properly.

Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>

diff -r 7bd1a40ae2bd -r c63e764da785 
linux-2.6-xen-sparse/arch/xen/x86_64/mm/fault.c
--- a/linux-2.6-xen-sparse/arch/xen/x86_64/mm/fault.c   Wed Aug 17 16:53:30 2005
+++ b/linux-2.6-xen-sparse/arch/xen/x86_64/mm/fault.c   Wed Aug 17 18:14:46 2005
@@ -250,7 +250,11 @@
           happen within a race in page table update. In the later
           case just flush. */
 
-       pgd = pgd_offset(current->mm ?: &init_mm, address);
+       /* On Xen the line below does not always work. Needs investigating! */
+       /*pgd = pgd_offset(current->mm ?: &init_mm, address);*/
+       pgd = (pgd_t *)per_cpu(cur_pgd, smp_processor_id());
+       pgd += pgd_index(address);
+
        pgd_ref = pgd_offset_k(address);
        if (pgd_none(*pgd_ref))
                return -1;

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