On Fri, Dec 06, 2024 at 10:01:14AM -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. Confirmed the BUG prints. Should we CC stable tree? > 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. > > v2: Sebastian helped identify that the problem was not exclusive to kernels > with PREEMPT_RT enabled. The delta between v1 and v2 is the description. > > Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@xxxxxxxxxx> Reviewed-by: Nicolin Chen <nicolinc@xxxxxxxxxx> Tested-by: Nicolin Chen <nicolinc@xxxxxxxxxx> Thanks Nicolin
