Sebastian Andrzej Siewior a9b8a98529
workqueue: Convert the pool::lock and wq_mayday_lock to raw_spinlock_t ...
The workqueue code has it's internal spinlocks (pool::lock), which
are acquired on most workqueue operations. These spinlocks are
converted to 'sleeping' spinlocks on a RT-kernel.
Workqueue functions can be invoked from contexts which are truly atomic
even on a PREEMPT_RT enabled kernel. Taking sleeping locks from such
contexts is forbidden.
The pool::lock hold times are bound and the code sections are
relatively short, which allows to convert pool::lock and as a
consequence wq_mayday_lock to raw spinlocks which are truly spinning
locks even on a PREEMPT_RT kernel.
With the previous conversion of the manager waitqueue to a simple
waitqueue workqueues are now fully RT compliant.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de >
Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com >
Signed-off-by: Tejun Heo <tj@kernel.org >
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