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| author | Luis Claudio R. Goncalves <lgoncalv@redhat.com> | 2024-12-06 16:01:14 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2024-12-10 02:38:30 +0300 |
| commit | 1f806218164d1bb93f3db21eaf61254b08acdf03 (patch) | |
| tree | 5c3ace523f1484647b955fc915bc24aad40e650b /tools/perf/scripts/python/export-to-sqlite.py | |
| parent | fac04efc5c793dccbd07e2d59af9f90b7fc0dca4 (diff) | |
| download | linux-1f806218164d1bb93f3db21eaf61254b08acdf03.tar.xz | |
iommu/tegra241-cmdqv: do not use smp_processor_id in preemptible context
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.
Cc: <stable@vger.kernel.org>
Fixes: 918eb5c856f6 ("iommu/arm-smmu-v3: Add in-kernel support for NVIDIA Tegra241 (Grace) CMDQV")
Signed-off-by: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/Z1L1mja3nXzsJ0Pk@uudg.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-sqlite.py')
0 files changed, 0 insertions, 0 deletions