lockdep: Add preemption enabled/disabled assertion APIs

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Asserting that preemption is enabled or disabled is a critical sanity
check.  Developers are usually reluctant to add such a check in a
fastpath as reading the preemption count can be costly.

Extend the lockdep API with macros asserting that preemption is disabled
or enabled. If lockdep is disabled, or if the underlying architecture
does not support kernel preemption, this assert has no runtime overhead.

References: f54bb2ec02 ("locking/lockdep: Add IRQs disabled/enabled assertion APIs: ...")
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200720155530.1173732-8-a.darwish@linutronix.de

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Ahmed S. Darwish 2020-07-20 17:55:13 +02:00 • committed by Peter Zijlstra

parent 932e463652

commit 8fd8ad5c5d

2 changed files with 20 additions and 0 deletions

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lib/Kconfig.debug

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