x86/xen/p2m: Replace ACCESS_ONCE with READ_ONCE
ACCESS_ONCE does not work reliably on non-scalar types. For example gcc 4.6 and 4.7 might remove the volatile tag for such accesses during the SRA (scalar replacement of aggregates) step (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145) Change the p2m code to replace ACCESS_ONCE with READ_ONCE. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: NJuergen Gross <jgross@suse.com> Acked-by: NDavid Vrabel <david.vrabel@citrix.com>
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