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[IA64] ptrace and restore_sigcontext() allow ar.rsc.pl==0
This patch fixes handling of accesses to ar.rsc via ptrace & restore_sigcontext [With Thanks to Chris Wright for noticing the restore_sigcontext path] Signed-off-by: Matthew Chapman <matthewc@hp.com> Acked-by: David Mosberger <davidm@hpl.hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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