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srcutree: Don't transition atomic SRCU to big in srcu_gp_end()

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Atomic SRCU must remain in the small size state. Warn if this
invariant is violated and avoid transitioning to big in that case.

[ paulmck: Folded "if" onto one line for 100-character limit. ]

Signed-off-by: Kunwu Chan <kunwu.chan@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Bradley Morgan <brads@mainlining.org>
This commit is contained in:
Kunwu Chan 2026-09-11 15:21:25 +08:00 committed by Paul E. McKenney
parent cbd520f619
commit 378ee30c81
1 changed files with 4 additions and 2 deletions
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6
kernel/rcu/srcutree.c
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@ -1073,8 +1073,10 @@ static void srcu_gp_end(struct srcu_struct *ssp, bool is_atomic)
raw_spin_unlock_irq_rcu_node(sup);
}
/* Transition to big if needed. */
if (ss_state != SRCU_SIZE_SMALL && ss_state != SRCU_SIZE_BIG) {
/* Transition to big if needed, but never for atomic SRCU. */
if (ssp->srcu_reader_flavor == SRCU_READ_FLAVOR_ATOMIC && ss_state != SRCU_SIZE_SMALL) {
WARN_ON_ONCE(1);
} else if (ss_state != SRCU_SIZE_SMALL && ss_state != SRCU_SIZE_BIG) {
if (ss_state == SRCU_SIZE_ALLOC)
init_srcu_struct_nodes(ssp, GFP_KERNEL);
else