2 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index ff374ceface0..dd574d51bcaa 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -466,6 +466,20 @@ static inline void tasklet_hi_schedule(struct tasklet_struct *t)
                 __tasklet_hi_schedule(t);
 }
 
+extern void __tasklet_hi_schedule_first(struct tasklet_struct *t);
+
+/*
+ * This version avoids touching any other tasklets. Needed for kmemcheck
+ * in order not to take any page faults while enqueueing this tasklet;
+ * consider VERY carefully whether you really need this or
+ * tasklet_hi_schedule()...
+ */
+static inline void tasklet_hi_schedule_first(struct tasklet_struct *t)
+{
+        if (!test_and_set_bit(TASKLET_STATE_SCHED, &t->state))
+                __tasklet_hi_schedule_first(t);
+}
+
 
 static inline void tasklet_disable_nosync(struct tasklet_struct *t)
 {
diff --git a/kernel/softirq.c b/kernel/softirq.c
index 258885a543db..b41fb710e114 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -382,6 +382,17 @@ void __tasklet_hi_schedule(struct tasklet_struct *t)
 
 EXPORT_SYMBOL(__tasklet_hi_schedule);
 
+void __tasklet_hi_schedule_first(struct tasklet_struct *t)
+{
+        BUG_ON(!irqs_disabled());
+
+        t->next = __get_cpu_var(tasklet_hi_vec).head;
+        __get_cpu_var(tasklet_hi_vec).head = t;
+        __raise_softirq_irqoff(HI_SOFTIRQ);
+}
+
+EXPORT_SYMBOL(__tasklet_hi_schedule_first);
+
 static void tasklet_action(struct softirq_action *a)
 {
         struct tasklet_struct *list;