lockdep: Change hardirq{s_enabled,_context} to per-cpu variables
Currently all IRQ-tracking state is in task_struct, this means that
task_struct needs to be defined before we use it.
Especially for lockdep_assert_irq*() this can lead to header-hell.
Move the hardirq state into per-cpu variables to avoid the task_struct
dependency.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200623083721.512673481@infradead.org
diff --git a/kernel/fork.c b/kernel/fork.c
index efc5493..70d9d0a 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1954,8 +1954,8 @@
rt_mutex_init_task(p);
+ lockdep_assert_irqs_enabled();
#ifdef CONFIG_PROVE_LOCKING
- DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
#endif
retval = -EAGAIN;
@@ -2036,7 +2036,6 @@
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
p->irq_events = 0;
- p->hardirqs_enabled = 0;
p->hardirq_enable_ip = 0;
p->hardirq_enable_event = 0;
p->hardirq_disable_ip = _THIS_IP_;
@@ -2046,7 +2045,6 @@
p->softirq_enable_event = 0;
p->softirq_disable_ip = 0;
p->softirq_disable_event = 0;
- p->hardirq_context = 0;
p->softirq_context = 0;
#endif