Ben Horgan c1376f1ff3 arm_mpam: Disable preemption when making accesses to fake MSC in kunit test ...

Accesses to MSC must be made from a cpu that is affine to that MSC and the
driver checks this in __mpam_write_reg() using smp_processor_id(). A fake
in-memory MSC is used for testing. When using that, it doesn't matter which
cpu we access it from but calling smp_processor_id() from a preemptible
context gives warnings when running with CONFIG_DEBUG_PREEMPT.

Add a test helper that wraps mpam_reset_msc_bitmap() with preemption
disabled to ensure all (fake) MSC accesses are made with preemption
disabled.

Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

2026-03-13 14:17:30 +00:00

..

Kconfig

arm_mpam: Add kunit test for bitmap reset

2025-11-19 18:34:24 +00:00

Makefile

arm_mpam: Add probe/remove for mpam msc driver and kbuild boiler plate

2025-11-19 18:34:20 +00:00

mpam_devices.c

arm_mpam: Fix null pointer dereference when restoring bandwidth counters

2026-03-13 14:17:30 +00:00

mpam_internal.h

arm_mpam: Use non-atomic bitops when modifying feature bitmap

2026-01-16 12:04:20 +00:00

test_mpam_devices.c

arm_mpam: Disable preemption when making accesses to fake MSC in kunit test

2026-03-13 14:17:30 +00:00