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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2026-04-07 19:22:33 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-04-07 22:24:49 +0300 |
| commit | 57b23c0f612dcfa1aae99c9422d6d36ced1670d4 (patch) | |
| tree | da0dc70d4373e430095714eb14c2b6606e864d01 /include/linux | |
| parent | a8aa306741cdeb7b1cb4832133390f9cd08ece14 (diff) | |
| download | linux-57b23c0f612dcfa1aae99c9422d6d36ced1670d4.tar.xz | |
bpf: Retire rcu_trace_implies_rcu_gp()
RCU Tasks Trace grace period implies RCU grace period, and this
guarantee is expected to remain in the future. Only BPF is the user of
this predicate, hence retire the API and clean up all in-tree users.
RCU Tasks Trace is now implemented on SRCU-fast and its grace period
mechanism always has at least one call to synchronize_rcu() as it is
required for SRCU-fast's correctness (it replaces the smp_mb() that
SRCU-fast readers skip). So, RCU-tt GP will always imply RCU GP.
Reviewed-by: Puranjay Mohan <puranjay@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260407162234.785270-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/rcupdate.h | 12 |
1 files changed, 0 insertions, 12 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index 04f3f86a4145..bfa765132de8 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -206,18 +206,6 @@ static inline void exit_tasks_rcu_finish(void) { } #endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */ /** - * rcu_trace_implies_rcu_gp - does an RCU Tasks Trace grace period imply an RCU grace period? - * - * As an accident of implementation, an RCU Tasks Trace grace period also - * acts as an RCU grace period. However, this could change at any time. - * Code relying on this accident must call this function to verify that - * this accident is still happening. - * - * You have been warned! - */ -static inline bool rcu_trace_implies_rcu_gp(void) { return true; } - -/** * cond_resched_tasks_rcu_qs - Report potential quiescent states to RCU * * This macro resembles cond_resched(), except that it is defined to |