Sebastian Andrzej Siewior cfa6705d89 radix-tree: Use local_lock for protection
The radix-tree and idr preload mechanisms use preempt_disable() to protect
the complete operation between xxx_preload() and xxx_preload_end().

As the code inside the preempt disabled section acquires regular spinlocks,
which are converted to 'sleeping' spinlocks on a PREEMPT_RT kernel and
eventually calls into a memory allocator, this conflicts with the RT
semantics.

Convert it to a local_lock which allows RT kernels to substitute them with
a real per CPU lock. On non RT kernels this maps to preempt_disable() as
before, but provides also lockdep coverage of the critical region.
No functional change.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20200527201119.1692513-3-bigeasy@linutronix.de
2020-05-28 10:31:09 +02:00
..
2019-09-20 09:06:26 -07:00
2020-03-21 15:24:03 +01:00
2020-02-04 03:05:26 +00:00
2018-08-16 12:14:42 -07:00
2017-02-24 17:46:57 -08:00
2019-12-07 11:00:19 -08:00
2018-10-16 13:45:44 +02:00
2019-07-11 15:17:41 -07:00
2018-06-27 18:58:49 +03:00
2018-10-15 16:31:29 -04:00
2017-08-15 09:02:07 -07:00