On Mon, Sep 14, 2026 at 05:34:14PM +0800, Kunwu Chan wrote: > The atomic SRCU fastpath enables synchronize_srcu_atomic() to be called > > from contexts with interrupts disabled. This series extends the > > rcutorture lockdep tests to cover the atomic SRCU path and fixes an > > IRQ-state preservation bug discovered along the way. > > > > Patch 1-2 add lockdep test coverage for atomic SRCU: > > - testtype 4: same-type atomic SRCU deadlock > > - testtype 5: atomic SRCU + raw spinlock dependency cycle > > - testtype 6: rcu_read_lock() -> synchronize_srcu_atomic() > > legitimate nesting, must not trigger lockdep warning > > > > Patch 3 fixes a bug where the synchronize_srcu_atomic() call chain > > unconditionally re-enables interrupts on unlock, by switching to the > > irqsave/irqrestore variants throughout the call chain. > > > > Patch 4 fixes a pre-existing double nerrs count in the script. > > > > Patch 5 adds testtype 7: cross-CPU IRQ context mismatch detection, > > where an atomic SRCU reader held with IRQs enabled on one CPU is > > paired with synchronize_srcu_atomic() via IPI on another CPU. >
Acked-by: Boqun Feng <[email protected]> Regards, Boqun > Kunwu Chan (5): > rcutorture: Add atomic SRCU lockdep support > selftests/rcutorture: Wire atomic SRCU into srcu_lockdep.sh > srcutree: Preserve IRQ state in synchronize_srcu_atomic() callchain > selftests/rcutorture: Fix double nerrs count in srcu_lockdep.sh > rcutorture: Add atomic SRCU cross-CPU IRQ context mismatch test > > kernel/rcu/rcutorture.c | 109 +++++++++++++++++- > kernel/rcu/srcutree.c | 42 ++++--- > .../selftests/rcutorture/bin/srcu_lockdep.sh | 77 ++++++++++++- > 3 files changed, 205 insertions(+), 23 deletions(-) > > -- > 2.43.0 > >
