x86: Use lockdep to assert IRQs are disabled/enabled

Use lockdep to check that IRQs are enabled or disabled as expected. This
way the sanity check only shows overhead when concurrency correctness
debug code is enabled.

It also makes no more sense to fix the IRQ flags when a bug is detected
as the assertion is now pure config-dependent debugging. And to quote
Peter Zijlstra:

	The whole if !disabled, disable logic is uber paranoid programming,
	but I don't think we've ever seen that WARN trigger, and if it does
	(and then burns the kernel) we at least know what happend.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: David S . Miller <davem@davemloft.net>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1509980490-4285-8-git-send-email-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2 files changed, 2 insertions, 4 deletions

diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index eaa0ba66cf96..d7d3cc24baf4 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -186,9 +186,7 @@ __visible inline void prepare_exit_to_usermode(struct pt_regs *regs)
 
         addr_limit_user_check();
 
-        if (IS_ENABLED(CONFIG_PROVE_LOCKING) && WARN_ON(!irqs_disabled()))
-                local_irq_disable();
-
+        lockdep_assert_irqs_disabled();
         lockdep_sys_exit();
 
         cached_flags = READ_ONCE(ti->flags);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 198416ddff01..4008b6b9ad72 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1095,7 +1095,7 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
         unsigned long flags;
         int err, ret = 0;
 
-        WARN_ON(irqs_disabled());
+        lockdep_assert_irqs_enabled();
 
         pr_debug("++++++++++++++++++++=_---CPU UP  %u\n", cpu);