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Merge branches 'doc.2022.06.21a', 'fixes.2022.07.19a', 'nocb.2022.07.19a', 'poll.2022.07.21a', 'rcu-tasks.2022.06.21a' and 'torture.2022.06.21a' into HEAD

Browse Source 
doc.2022.06.21a: Documentation updates.
fixes.2022.07.19a: Miscellaneous fixes.
nocb.2022.07.19a: Callback-offload updates.
poll.2022.07.21a: Polled grace-period updates.
rcu-tasks.2022.06.21a: Tasks RCU updates.
torture.2022.06.21a: Torture-test updates.
This commit is contained in:
Paul E. McKenney
2022-07-21 17:43:16 -07:00
parent 89f7f29140 a03ae49c47 0578e14c94 28787e04fb e72ee5e1a8 7bf336fb8d
commit d38c8fe483
28 changed files with 1223 additions and 484 deletions
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28
include/linux/rcupdate.h
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@@ -41,6 +41,7 @@ void call_rcu(struct rcu_head *head, rcu_callback_t func);
void rcu_barrier_tasks(void);
void rcu_barrier_tasks_rude(void);
void synchronize_rcu(void);
unsigned long get_completed_synchronize_rcu(void);
#ifdef CONFIG_PREEMPT_RCU
@@ -169,13 +170,24 @@ void synchronize_rcu_tasks(void);
# endif
# ifdef CONFIG_TASKS_TRACE_RCU
# define rcu_tasks_trace_qs(t) \
do { \
if (!likely(READ_ONCE((t)->trc_reader_checked)) && \
!unlikely(READ_ONCE((t)->trc_reader_nesting))) { \
smp_store_release(&(t)->trc_reader_checked, true); \
smp_mb(); /* Readers partitioned by store. */ \
} \
// Bits for ->trc_reader_special.b.need_qs field.
#define TRC_NEED_QS 0x1 // Task needs a quiescent state.
#define TRC_NEED_QS_CHECKED 0x2 // Task has been checked for needing quiescent state.
u8 rcu_trc_cmpxchg_need_qs(struct task_struct *t, u8 old, u8 new);
void rcu_tasks_trace_qs_blkd(struct task_struct *t);
# define rcu_tasks_trace_qs(t) \
do { \
int ___rttq_nesting = READ_ONCE((t)->trc_reader_nesting); \
\
if (likely(!READ_ONCE((t)->trc_reader_special.b.need_qs)) && \
likely(!___rttq_nesting)) { \
rcu_trc_cmpxchg_need_qs((t), 0, TRC_NEED_QS_CHECKED); \
} else if (___rttq_nesting && ___rttq_nesting != INT_MIN && \
!READ_ONCE((t)->trc_reader_special.b.blocked)) { \
rcu_tasks_trace_qs_blkd(t); \
} \
} while (0)
# else
# define rcu_tasks_trace_qs(t) do { } while (0)
@@ -184,7 +196,7 @@ void synchronize_rcu_tasks(void);
#define rcu_tasks_qs(t, preempt) \
do { \
rcu_tasks_classic_qs((t), (preempt)); \
rcu_tasks_trace_qs((t)); \
rcu_tasks_trace_qs(t); \
} while (0)
# ifdef CONFIG_TASKS_RUDE_RCU