x86, NMI watchdog: add support to enable and disable IOAPIC NMI
Impact: change/improve the way /proc/sys/kernel/nmi_watchdog works This patch adds support to enable/disable IOAPIC NMI watchdog in runtime via procfs. Signed-off-by: NAristeu Rozanski <aris@redhat.com> Cc: "Maciej W. Rozycki" <macro@linux-mips.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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