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Merge branches 'doc.2024.06.06a', 'fixes.2024.07.04a', 'mb.2024.06.28a', 'nocb.2024.06.03a', 'rcu-tasks.2024.06.06a', 'rcutorture.2024.06.06a' and 'srcu.2024.06.18a' into HEAD

Browse Source 
doc.2024.06.06a: Documentation updates.
fixes.2024.07.04a: Miscellaneous fixes.
mb.2024.06.28a: Grace-period memory-barrier redundancy removal.
nocb.2024.06.03a: No-CB CPU updates.
rcu-tasks.2024.06.06a: RCU-Tasks updates.
rcutorture.2024.06.06a: Torture-test updates.
srcu.2024.06.18a: SRCU polled-grace-period updates.
This commit is contained in:
Paul E. McKenney
2024-07-04 13:54:17 -07:00
parent a3fbf86063 55d4669ef1 677ab23bdf e4f7805729 399ced9594 0ac55d095d e206f33e2c
commit 02219caa92
22 changed files with 405 additions and 268 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/rcupdate.h
+60 -2
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@@ -209,7 +209,6 @@ void synchronize_rcu_tasks_rude(void);
#define rcu_note_voluntary_context_switch(t) rcu_tasks_qs(t, false)
void exit_tasks_rcu_start(void);
void exit_tasks_rcu_stop(void);
void exit_tasks_rcu_finish(void);
#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
#define rcu_tasks_classic_qs(t, preempt) do { } while (0)
@@ -218,7 +217,6 @@ void exit_tasks_rcu_finish(void);
#define call_rcu_tasks call_rcu
#define synchronize_rcu_tasks synchronize_rcu
static inline void exit_tasks_rcu_start(void) { }
static inline void exit_tasks_rcu_stop(void) { }
static inline void exit_tasks_rcu_finish(void) { }
#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */
@@ -421,11 +419,71 @@ static inline void rcu_preempt_sleep_check(void) { }
"Illegal context switch in RCU-sched read-side critical section"); \
} while (0)
// See RCU_LOCKDEP_WARN() for an explanation of the double call to
// debug_lockdep_rcu_enabled().
static inline bool lockdep_assert_rcu_helper(bool c)
{
return debug_lockdep_rcu_enabled() &&
(c || !rcu_is_watching() || !rcu_lockdep_current_cpu_online()) &&
debug_lockdep_rcu_enabled();
}
/**
* lockdep_assert_in_rcu_read_lock - WARN if not protected by rcu_read_lock()
*
* Splats if lockdep is enabled and there is no rcu_read_lock() in effect.
*/
#define lockdep_assert_in_rcu_read_lock() \
WARN_ON_ONCE(lockdep_assert_rcu_helper(!lock_is_held(&rcu_lock_map)))
/**
* lockdep_assert_in_rcu_read_lock_bh - WARN if not protected by rcu_read_lock_bh()
*
* Splats if lockdep is enabled and there is no rcu_read_lock_bh() in effect.
* Note that local_bh_disable() and friends do not suffice here, instead an
* actual rcu_read_lock_bh() is required.
*/
#define lockdep_assert_in_rcu_read_lock_bh() \
WARN_ON_ONCE(lockdep_assert_rcu_helper(!lock_is_held(&rcu_bh_lock_map)))
/**
* lockdep_assert_in_rcu_read_lock_sched - WARN if not protected by rcu_read_lock_sched()
*
* Splats if lockdep is enabled and there is no rcu_read_lock_sched()
* in effect. Note that preempt_disable() and friends do not suffice here,
* instead an actual rcu_read_lock_sched() is required.
*/
#define lockdep_assert_in_rcu_read_lock_sched() \
WARN_ON_ONCE(lockdep_assert_rcu_helper(!lock_is_held(&rcu_sched_lock_map)))
/**
* lockdep_assert_in_rcu_reader - WARN if not within some type of RCU reader
*
* Splats if lockdep is enabled and there is no RCU reader of any
* type in effect. Note that regions of code protected by things like
* preempt_disable, local_bh_disable(), and local_irq_disable() all qualify
* as RCU readers.
*
* Note that this will never trigger in PREEMPT_NONE or PREEMPT_VOLUNTARY
* kernels that are not also built with PREEMPT_COUNT. But if you have
* lockdep enabled, you might as well also enable PREEMPT_COUNT.
*/
#define lockdep_assert_in_rcu_reader() \
WARN_ON_ONCE(lockdep_assert_rcu_helper(!lock_is_held(&rcu_lock_map) && \
!lock_is_held(&rcu_bh_lock_map) && \
!lock_is_held(&rcu_sched_lock_map) && \
preemptible()))
#else /* #ifdef CONFIG_PROVE_RCU */
#define RCU_LOCKDEP_WARN(c, s) do { } while (0 && (c))
#define rcu_sleep_check() do { } while (0)
#define lockdep_assert_in_rcu_read_lock() do { } while (0)
#define lockdep_assert_in_rcu_read_lock_bh() do { } while (0)
#define lockdep_assert_in_rcu_read_lock_sched() do { } while (0)
#define lockdep_assert_in_rcu_reader() do { } while (0)
#endif /* #else #ifdef CONFIG_PROVE_RCU */
/*