From c90e3ecc91584558d24c82940a3651fdfc174be0 Mon Sep 17 00:00:00 2001 From: Onkarnath Date: Thu, 11 Jan 2024 14:57:22 +0530 Subject: [PATCH] rcu/sync: remove un-used rcu_sync_enter_start function With commit '6a010a49b63a ("cgroup: Make !percpu threadgroup_rwsem operations optional")' usage of rcu_sync_enter_start is removed. So this function can also be removed. In the words of Oleg Nesterov: __rcu_sync_enter(wait => false) is a better alternative if someone needs rcu_sync_enter_start() again. Link: https://lore.kernel.org/all/20220725121208.GB28662@redhat.com/ Signed-off-by: Onkarnath Signed-off-by: Maninder Singh Acked-by: Oleg Nesterov Acked-by: Tejun Heo Reviewed-by: Paul E. McKenney Signed-off-by: Boqun Feng --- include/linux/rcu_sync.h | 1 - kernel/rcu/sync.c | 16 ---------------- 2 files changed, 17 deletions(-) diff --git a/include/linux/rcu_sync.h b/include/linux/rcu_sync.h index 0027d4c8087c..3860dbb9107a 100644 --- a/include/linux/rcu_sync.h +++ b/include/linux/rcu_sync.h @@ -37,7 +37,6 @@ static inline bool rcu_sync_is_idle(struct rcu_sync *rsp) } extern void rcu_sync_init(struct rcu_sync *); -extern void rcu_sync_enter_start(struct rcu_sync *); extern void rcu_sync_enter(struct rcu_sync *); extern void rcu_sync_exit(struct rcu_sync *); extern void rcu_sync_dtor(struct rcu_sync *); diff --git a/kernel/rcu/sync.c b/kernel/rcu/sync.c index e550f97779b8..86df878a2fee 100644 --- a/kernel/rcu/sync.c +++ b/kernel/rcu/sync.c @@ -24,22 +24,6 @@ void rcu_sync_init(struct rcu_sync *rsp) init_waitqueue_head(&rsp->gp_wait); } -/** - * rcu_sync_enter_start - Force readers onto slow path for multiple updates - * @rsp: Pointer to rcu_sync structure to use for synchronization - * - * Must be called after rcu_sync_init() and before first use. - * - * Ensures rcu_sync_is_idle() returns false and rcu_sync_{enter,exit}() - * pairs turn into NO-OPs. - */ -void rcu_sync_enter_start(struct rcu_sync *rsp) -{ - rsp->gp_count++; - rsp->gp_state = GP_PASSED; -} - - static void rcu_sync_func(struct rcu_head *rhp); static void rcu_sync_call(struct rcu_sync *rsp)