x86: smpboot - check if we have ESR register in wakeup_secondary_cpu
We should check if we have ESR register before reading from it. Signed-off-by: NCyrill Gorcunov <gorcunov@gmail.com> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Cc: "Maciej W. Rozycki" <macro@linux-mips.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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