On Fri, 06 Dec 2024 10:01:14 -0300, Luis Claudio R. Goncalves wrote:

During boot some of the calls to tegra241_cmdqv_get_cmdq() will happen
in preemptible context. As this function calls smp_processor_id(), if
CONFIG_DEBUG_PREEMPT is enabled, these calls will trigger a series of
"BUG: using smp_processor_id() in preemptible" backtraces.

As tegra241_cmdqv_get_cmdq() only calls smp_processor_id() to use the
CPU number as a factor to balance out traffic on cmdq usage, it is safe
to use raw_smp_processor_id() here.

[...]

Applied to will (for-joerg/arm-smmu/fixes), thanks!

[1/1] iommu/tegra241-cmdqv: do not use smp_processor_id in preemptible context
      https://git.kernel.org/will/c/1f806218164d

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev