[PATCH] cond_resched(): fix bogus might_sleep() warning

[safe/jmp/linux-2.6] / kernel / sched.c

diff --git a/kernel/sched.c b/kernel/sched.c
index 5f2182d..4107db0 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3877,6 +3877,13 @@ asmlinkage long sys_sched_yield(void)
 
 static inline void __cond_resched(void)
 {
+       /*
+        * The BKS might be reacquired before we have dropped
+        * PREEMPT_ACTIVE, which could trigger a second
+        * cond_resched() call.
+        */
+       if (unlikely(preempt_count()))
+               return;
        do {
                add_preempt_count(PREEMPT_ACTIVE);
                schedule();