[git pull] scheduler fixes

Ingo Molnar
2007-12-07T18:21:54Z

Linus, please pull the latest scheduler git tree from:

git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git

two commits: a lockdep warning improvement and a sched_clock() fix.
Thanks,

Ingo

------------------>
Ingo Molnar (2):
lockdep: make cli/sti annotation warnings clearer
sched: enable early use of sched_clock()

lockdep.c | 13 +++++++++----
sched.c | 7 ++++++-
2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 0f38962..723bd9f 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2654,10 +2654,15 @@ static void check_flags(unsigned long flags)
if (!debug_locks)
return;

- if (irqs_disabled_flags(flags))
- DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled);
- else
- DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled);
+ if (irqs_disabled_flags(flags)) {
+ if (DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)) {
+ printk("possible reason: unannotated irqs-off.\n");
+ }
+ } else {
+ if (DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)) {
+ printk("possible reason: unannotated irqs-on.\n");
+ }
+ }

/*
* We dont accurately track softirq state in e.g.
diff --git a/kernel/sched.c b/kernel/sched.c
index 67d9d17..c6e551d 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -488,7 +488,12 @@ unsigned long long cpu_clock(int cpu)

local_irq_save(flags);
rq = cpu_rq(cpu);
- update_rq_clock(rq);
+ /*
+ * Only call sched_clock() if the scheduler has already been
+ * initialized (some code might call cpu_clock() very early):
+ */
+ if (rq->idle)
+ update_rq_clock(rq);
now = rq->clock;
local_irq_restore(flags);