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| author | Ankur Arora <ankur.a.arora@oracle.com> | 2024-12-13 07:06:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-06-04 15:42:13 +0300 |
| commit | 9abec90c85b22983c88510e77844b507cbd80db5 (patch) | |
| tree | e3cbbe0b13e706983789a72e0be007d28653430d /include/linux | |
| parent | 4a36d93a01758589267a51cd871962a638964888 (diff) | |
| download | linux-9abec90c85b22983c88510e77844b507cbd80db5.tar.xz | |
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rcupdate.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 72da69cc5764..27531a0b3a6e 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -97,9 +97,9 @@ static inline void __rcu_read_lock(void) static inline void __rcu_read_unlock(void) { - preempt_enable(); if (IS_ENABLED(CONFIG_RCU_STRICT_GRACE_PERIOD)) rcu_read_unlock_strict(); + preempt_enable(); } static inline int rcu_preempt_depth(void) |