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-rw-r--r--kernel/rcutiny.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/kernel/rcutiny.c b/kernel/rcutiny.c
index 4eb34fcc2a75..c8b0e1582c04 100644
--- a/kernel/rcutiny.c
+++ b/kernel/rcutiny.c
@@ -53,7 +53,7 @@ static void __call_rcu(struct rcu_head *head,
#include "rcutiny_plugin.h"
-static long long rcu_dynticks_nesting = DYNTICK_TASK_NESTING;
+static long long rcu_dynticks_nesting = DYNTICK_TASK_EXIT_IDLE;
/* Common code for rcu_idle_enter() and rcu_irq_exit(), see kernel/rcutree.c. */
static void rcu_idle_enter_common(long long oldval)
@@ -88,7 +88,12 @@ void rcu_idle_enter(void)
local_irq_save(flags);
oldval = rcu_dynticks_nesting;
- rcu_dynticks_nesting = 0;
+ WARN_ON_ONCE((rcu_dynticks_nesting & DYNTICK_TASK_NEST_MASK) == 0);
+ if ((rcu_dynticks_nesting & DYNTICK_TASK_NEST_MASK) ==
+ DYNTICK_TASK_NEST_VALUE)
+ rcu_dynticks_nesting = 0;
+ else
+ rcu_dynticks_nesting -= DYNTICK_TASK_NEST_VALUE;
rcu_idle_enter_common(oldval);
local_irq_restore(flags);
}
@@ -140,8 +145,11 @@ void rcu_idle_exit(void)
local_irq_save(flags);
oldval = rcu_dynticks_nesting;
- WARN_ON_ONCE(oldval != 0);
- rcu_dynticks_nesting = DYNTICK_TASK_NESTING;
+ WARN_ON_ONCE(rcu_dynticks_nesting < 0);
+ if (rcu_dynticks_nesting & DYNTICK_TASK_NEST_MASK)
+ rcu_dynticks_nesting += DYNTICK_TASK_NEST_VALUE;
+ else
+ rcu_dynticks_nesting = DYNTICK_TASK_EXIT_IDLE;
rcu_idle_exit_common(oldval);
local_irq_restore(flags);
}