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| author | Mike Galbraith <efault@gmx.de> | 2011-12-07 12:48:42 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-02-19 08:42:47 +0100 |
| commit | 066361a7c58cb6c8b18c7ce0ee8527bb1ce58460 (patch) | |
| tree | f85ceaaf812d371256cb8c063c277c86d5472991 | |
| parent | locking: Various static lock initializer fixes (diff) | |
| download | linux-066361a7c58cb6c8b18c7ce0ee8527bb1ce58460.tar.xz linux-066361a7c58cb6c8b18c7ce0ee8527bb1ce58460.zip | |
intel_idle: Convert i7300_idle_lock to raw_spinlock
24 core Intel box's first exposure to 3.0.12-rt30-rc3 didn't go well.
[ 27.104159] i7300_idle: loaded v1.55
[ 27.104192] BUG: scheduling while atomic: swapper/2/0/0x00000002
[ 27.104309] Pid: 0, comm: swapper/2 Tainted: G N 3.0.12-rt30-rc3-rt #1
[ 27.104317] Call Trace:
[ 27.104338] [<ffffffff810046a5>] dump_trace+0x85/0x2e0
[ 27.104372] [<ffffffff8144eb00>] thread_return+0x12b/0x30b
[ 27.104381] [<ffffffff8144f1b9>] schedule+0x29/0xb0
[ 27.104389] [<ffffffff814506e5>] rt_spin_lock_slowlock+0xc5/0x240
[ 27.104401] [<ffffffffa01f818f>] i7300_idle_notifier+0x3f/0x360 [i7300_idle]
[ 27.104415] [<ffffffff814546c7>] notifier_call_chain+0x37/0x70
[ 27.104426] [<ffffffff81454748>] __atomic_notifier_call_chain+0x48/0x70
[ 27.104439] [<ffffffff81001a39>] cpu_idle+0x89/0xb0
[ 27.104449] bad: scheduling from the idle thread!
This lock is taken from interrupt disabled context in the guts of
idle. Convert it to a raw_spinlock.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Andy Henroid <andrew.d.henroid@intel.com>
Link: http://lkml.kernel.org/r/1323258522.5057.73.camel@marge.simson.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | drivers/idle/i7300_idle.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/idle/i7300_idle.c b/drivers/idle/i7300_idle.c index fa080ebd568f..ffeebc7e9f1c 100644 --- a/drivers/idle/i7300_idle.c +++ b/drivers/idle/i7300_idle.c @@ -75,7 +75,7 @@ static unsigned long past_skip; static struct pci_dev *fbd_dev; -static spinlock_t i7300_idle_lock; +static raw_spinlock_t i7300_idle_lock; static int i7300_idle_active; static u8 i7300_idle_thrtctl_saved; @@ -457,7 +457,7 @@ static int i7300_idle_notifier(struct notifier_block *nb, unsigned long val, idle_begin_time = ktime_get(); } - spin_lock_irqsave(&i7300_idle_lock, flags); + raw_spin_lock_irqsave(&i7300_idle_lock, flags); if (val == IDLE_START) { cpumask_set_cpu(smp_processor_id(), idle_cpumask); @@ -506,7 +506,7 @@ static int i7300_idle_notifier(struct notifier_block *nb, unsigned long val, } } end: - spin_unlock_irqrestore(&i7300_idle_lock, flags); + raw_spin_unlock_irqrestore(&i7300_idle_lock, flags); return 0; } @@ -548,7 +548,7 @@ struct debugfs_file_info { static int __init i7300_idle_init(void) { - spin_lock_init(&i7300_idle_lock); + raw_spin_lock_init(&i7300_idle_lock); total_us = 0; if (i7300_idle_platform_probe(&fbd_dev, &ioat_dev, forceload)) |