irqdomain: Drop revmap mutex

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The revmap mutex is essentially only used to maintain the integrity of
the radix tree during updates (lookups use RCU).

As the global irq_domain_mutex is now held in all paths that update the
revmap structures there is strictly no longer any need for the dedicated
mutex, which can be removed.

Drop the revmap mutex and add lockdep assertions to the revmap helpers
to make sure that the global lock is always held when updating the
revmap.

Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-9-johan+linaro@kernel.org

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Johan Hovold 2023-02-13 11:42:50 +01:00 • committed by Marc Zyngier

parent 8932c32c30

commit 47d1932f37

2 changed files with 6 additions and 9 deletions

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2

include/linux/irqdomain.h

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13

kernel/irq/irqdomain.c

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