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McKenney" , Boqun Feng , rcu@vger.kernel.org, Neeraj Upadhyay , Josh Triplett , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Shuah Khan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH -next 3/8] rcu/nocb: Remove unnecessary WakeOvfIsDeferred wake path Message-ID: <20260109013911.GA1102915@joelbox2> References: <20260101163417.1065705-1-joelagnelf@nvidia.com> <20260101163417.1065705-4-joelagnelf@nvidia.com> Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Jan 08, 2026 at 04:57:26PM +0100, Frederic Weisbecker wrote: > Le Thu, Jan 01, 2026 at 11:34:12AM -0500, Joel Fernandes a écrit : > > @@ -974,8 +959,7 @@ static bool do_nocb_deferred_wakeup_common(struct rcu_data *rdp_gp, > > return false; > > } > > > > - ndw = rdp_gp->nocb_defer_wakeup; > > - ret = __wake_nocb_gp(rdp_gp, rdp, ndw == RCU_NOCB_WAKE_FORCE, flags); > > + ret = __wake_nocb_gp(rdp_gp, rdp, false, flags); > > The force parameter can now be removed, right? (same applies to wake_nocb_gp()). > > Other than that: > > Reviewed-by: Frederic Weisbecker Ah true! Thanks, so the following hunk needs to be squashed into the patch then, with the review tag. Boqun, if you want to do that please do, or I can send it again for the next merge window. ---8<----------------------- From: "Joel Fernandes" Subject: [PATCH] fixup! rcu/nocb: Remove unnecessary WakeOvfIsDeferred wake path Signed-off-by: Joel Fernandes --- kernel/rcu/tree.c | 2 +- kernel/rcu/tree.h | 2 +- kernel/rcu/tree_nocb.h | 14 +++++++------- 3 files changed, 9 insertions(+), 9 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 293bbd9ac3f4..2921ffb19939 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3769,7 +3769,7 @@ static void rcu_barrier_entrain(struct rcu_data *rdp) } rcu_nocb_unlock(rdp); if (wake_nocb) - wake_nocb_gp(rdp, false); + wake_nocb_gp(rdp); smp_store_release(&rdp->barrier_seq_snap, gseq); } diff --git a/kernel/rcu/tree.h b/kernel/rcu/tree.h index 653fb4ba5852..7dfc57e9adb1 100644 --- a/kernel/rcu/tree.h +++ b/kernel/rcu/tree.h @@ -499,7 +499,7 @@ static void zero_cpu_stall_ticks(struct rcu_data *rdp); static struct swait_queue_head *rcu_nocb_gp_get(struct rcu_node *rnp); static void rcu_nocb_gp_cleanup(struct swait_queue_head *sq); static void rcu_init_one_nocb(struct rcu_node *rnp); -static bool wake_nocb_gp(struct rcu_data *rdp, bool force); +static bool wake_nocb_gp(struct rcu_data *rdp); static bool rcu_nocb_flush_bypass(struct rcu_data *rdp, struct rcu_head *rhp, unsigned long j, bool lazy); static void call_rcu_nocb(struct rcu_data *rdp, struct rcu_head *head, diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h index daff2756cd90..c6f1ddecc2d8 100644 --- a/kernel/rcu/tree_nocb.h +++ b/kernel/rcu/tree_nocb.h @@ -192,7 +192,7 @@ static void rcu_init_one_nocb(struct rcu_node *rnp) static bool __wake_nocb_gp(struct rcu_data *rdp_gp, struct rcu_data *rdp, - bool force, unsigned long flags) + unsigned long flags) __releases(rdp_gp->nocb_gp_lock) { bool needwake = false; @@ -225,13 +225,13 @@ static bool __wake_nocb_gp(struct rcu_data *rdp_gp, /* * Kick the GP kthread for this NOCB group. */ -static bool wake_nocb_gp(struct rcu_data *rdp, bool force) +static bool wake_nocb_gp(struct rcu_data *rdp) { unsigned long flags; struct rcu_data *rdp_gp = rdp->nocb_gp_rdp; raw_spin_lock_irqsave(&rdp_gp->nocb_gp_lock, flags); - return __wake_nocb_gp(rdp_gp, rdp, force, flags); + return __wake_nocb_gp(rdp_gp, rdp, flags); } #ifdef CONFIG_RCU_LAZY @@ -553,7 +553,7 @@ static void __call_rcu_nocb_wake(struct rcu_data *rdp, bool was_alldone, TPS("WakeLazy")); } else if (!irqs_disabled_flags(flags)) { /* ... if queue was empty ... */ - wake_nocb_gp(rdp, false); + wake_nocb_gp(rdp); trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("WakeEmpty")); } else { @@ -959,7 +959,7 @@ static bool do_nocb_deferred_wakeup_common(struct rcu_data *rdp_gp, return false; } - ret = __wake_nocb_gp(rdp_gp, rdp, false, flags); + ret = __wake_nocb_gp(rdp_gp, rdp, flags); trace_rcu_nocb_wake(rcu_state.name, rdp->cpu, TPS("DeferredWake")); return ret; @@ -1255,7 +1255,7 @@ lazy_rcu_shrink_scan(struct shrinker *shrink, struct shrink_control *sc) } rcu_nocb_try_flush_bypass(rdp, jiffies); rcu_nocb_unlock_irqrestore(rdp, flags); - wake_nocb_gp(rdp, false); + wake_nocb_gp(rdp); sc->nr_to_scan -= _count; count += _count; if (sc->nr_to_scan <= 0) @@ -1640,7 +1640,7 @@ static void rcu_init_one_nocb(struct rcu_node *rnp) { } -static bool wake_nocb_gp(struct rcu_data *rdp, bool force) +static bool wake_nocb_gp(struct rcu_data *rdp) { return false; } -- 2.34.1