Ankur Arora 9abec90c85 rcu: handle unstable rdp in rcu_read_unlock_strict() ...

[ Upstream commit fcf0e25ad4c8d14d2faab4d9a17040f31efce205 ]

rcu_read_unlock_strict() can be called with preemption enabled
which can make for an unstable rdp and a racy norm value.

Fix this by dropping the preempt-count in __rcu_read_unlock()
after the call to rcu_read_unlock_strict(), adjusting the
preempt-count check appropriately.

Suggested-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2025-06-04 14:42:13 +02:00

..

Kconfig

rcu: Employ jiffies-based backstop to callback time limit

2023-05-11 13:42:39 -07:00

Kconfig.debug

rcu: Allow up to five minutes expedited RCU CPU stall-warning timeouts

2023-01-09 12:09:52 -08:00

Makefile

…

rcu_segcblist.c

rcu: Throttle callback invocation based on number of ready callbacks

2023-01-03 17:28:34 -08:00

rcu_segcblist.h

rcu: Throttle callback invocation based on number of ready callbacks

2023-01-03 17:28:34 -08:00

rcu.h

rcu: Dump memory object info if callback function is invalid

2024-08-29 17:33:23 +02:00

rcuscale.c

rcuscale: Do a proper cleanup if kfree_scale_init() fails

2024-12-09 10:31:50 +01:00

rcutorture.c

rcutorture: Fix rcu_torture_fwd_cb_cr() data race

2024-08-14 13:58:41 +02:00

refscale.c

refscale: Add a "jiffies" test

2023-07-14 15:01:04 -07:00

srcutiny.c

rcu: Dump memory object info if callback function is invalid

2024-08-29 17:33:23 +02:00

srcutree.c

rcu: Dump memory object info if callback function is invalid

2024-08-29 17:33:23 +02:00

sync.c

rcu/sync: Use call_rcu_hurry() instead of call_rcu

2022-11-29 14:04:33 -08:00

tasks.h

rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb()

2024-11-08 16:28:22 +01:00

tiny.c

rcu: Dump memory object info if callback function is invalid

2024-08-29 17:33:23 +02:00

tree_exp.h

rcu/exp: Handle RCU expedited grace period kworker allocation failure

2024-03-26 18:19:17 -04:00

tree_nocb.h

rcu/nocb: Fix rcuog wake-up from offline softirq

2024-10-17 15:24:30 +02:00

tree_plugin.h

rcu: handle unstable rdp in rcu_read_unlock_strict()

2025-06-04 14:42:13 +02:00

tree_stall.h

rcu: Fix buffer overflow in print_cpu_stall_info()

2024-06-12 11:11:32 +02:00

tree.c

rcu/kvfree: Fix data-race in __mod_timer / kvfree_call_rcu

2024-12-09 10:31:49 +01:00

tree.h

rcu/nocb: Remove buggy bypass lock contention mitigation

2024-09-08 07:54:44 +02:00

update.c

Merge branch 'stall.2023.01.09a' into HEAD

2023-02-02 16:40:07 -08:00