Merge branch 'locking/nmi' into locking/core, to pick up completed topic branch

Signed-off-by: NIngo Molnar <mingo@kernel.org>

arch/x86/Kconfig.debug

@@ -3,6 +3,9 @@
 config TRACE_IRQFLAGS_SUPPORT
 	def_bool y
 
+config TRACE_IRQFLAGS_NMI_SUPPORT
+	def_bool y
+
 config EARLY_PRINTK_USB
 	bool
 

kernel/locking/lockdep.c

@@ -3714,6 +3714,9 @@ void noinstr lockdep_hardirqs_on(unsigned long ip)
 	 * and not rely on hardware state like normal interrupts.
 	 */
 	if (unlikely(in_nmi())) {
+		if (!IS_ENABLED(CONFIG_TRACE_IRQFLAGS_NMI))
+			return;
+
 		/*
 		 * Skip:
 		 *  - recursion check, because NMI can hit lockdep;
@@ -3773,7 +3776,10 @@ void noinstr lockdep_hardirqs_off(unsigned long ip)
 	 * they will restore the software state. This ensures the software
 	 * state is consistent inside NMIs as well.
 	 */
-	if (unlikely(!in_nmi() && (current->lockdep_recursion & LOCKDEP_RECURSION_MASK)))
+	if (in_nmi()) {
+		if (!IS_ENABLED(CONFIG_TRACE_IRQFLAGS_NMI))
+			return;
+	} else if (current->lockdep_recursion & LOCKDEP_RECURSION_MASK)
 		return;
 
 	/*

lib/Kconfig.debug

@@ -1326,11 +1326,17 @@ config WW_MUTEX_SELFTEST
 endmenu # lock debugging
 
 config TRACE_IRQFLAGS
+	depends on TRACE_IRQFLAGS_SUPPORT
 	bool
 	help
 	  Enables hooks to interrupt enabling and disabling for
 	  either tracing or lock debugging.
 
+config TRACE_IRQFLAGS_NMI
+	def_bool y
+	depends on TRACE_IRQFLAGS
+	depends on TRACE_IRQFLAGS_NMI_SUPPORT
+
 config STACKTRACE
 	bool "Stack backtrace support"
 	depends on STACKTRACE_SUPPORT