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From: paulmck@kernel.org
To: rcu@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com,
	mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com,
	akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
	josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
	rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
	fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org,
	"Paul E. McKenney" <paulmck@kernel.org>
Subject: [PATCH tip/core/rcu 18/19] rcu: Convert rcu_initiate_boost() ULONG_CMP_GE() to time_after()
Date: Wed, 15 Apr 2020 10:10:53 -0700	[thread overview]
Message-ID: <20200415171054.9013-18-paulmck@kernel.org> (raw)
In-Reply-To: <20200415171017.GA7821@paulmck-ThinkPad-P72>

From: "Paul E. McKenney" <paulmck@kernel.org>

This commit converts the ULONG_CMP_GE() in rcu_initiate_boost() to
time_after() to reflect the fact that it is comparing a timestamp to
the jiffies counter.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 kernel/rcu/tree_plugin.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index 664d0aa..5cd27c2 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1080,7 +1080,7 @@ static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
 	    (rnp->gp_tasks != NULL &&
 	     rnp->boost_tasks == NULL &&
 	     rnp->qsmask == 0 &&
-	     (ULONG_CMP_GE(jiffies, rnp->boost_time) || rcu_state.cbovld))) {
+	     (!time_after(rnp->boost_time, jiffies) || rcu_state.cbovld))) {
 		if (rnp->exp_tasks == NULL)
 			WRITE_ONCE(rnp->boost_tasks, rnp->gp_tasks);
 		raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
-- 
2.9.5


  parent reply	other threads:[~2020-04-15 17:11 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-15 17:10 [PATCH tip/core/rcu 0/19] Miscellaneous fixes for v5.8 Paul E. McKenney
2020-04-15 17:10 ` [PATCH tip/core/rcu 01/19] rcu: Add KCSAN stubs paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 02/19] srcu: " paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 03/19] rcu: Mark rcu_state.ncpus to detect concurrent writes paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 04/19] rcu: Add *_ONCE() and data_race() to rcu_node ->exp_tasks plus locking paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 05/19] rcu: Add READ_ONCE and data_race() to rcu_node ->boost_tasks paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 06/19] srcu: Add data_race() to ->srcu_lock_count and ->srcu_unlock_count arrays paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 07/19] rcu: Add WRITE_ONCE() to rcu_node ->boost_tasks paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 08/19] rcu: Use data_race() for RCU CPU stall-warning prints paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 09/19] drm: Make drm_dp_mst_dsc_aux_for_port() safe for old compilers paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 10/19] rcu: Expedite first two FQS scans under callback-overload conditions paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 11/19] rcu: Fix the (t=0 jiffies) false positive paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 12/19] Revert "rculist: Describe variadic macro argument in a Sphinx-compatible way" paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 13/19] rcu: Get rid of some doc warnings in update.c paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 14/19] rcu: Mark rcu_state.gp_seq to detect more concurrent writes paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 15/19] rcu: Replace assigned pointer ret value by corresponding boolean value paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 16/19] rcu: Replace 1 by true paulmck
2020-04-15 17:10 ` [PATCH tip/core/rcu 17/19] rcu: Convert ULONG_CMP_GE() to time_after() for jiffy comparison paulmck
2020-04-15 17:10 ` paulmck [this message]
2020-04-15 17:10 ` [PATCH tip/core/rcu 19/19] rcu: Convert rcu_nohz_full_cpu() ULONG_CMP_LT() to time_before() paulmck
2020-04-15 17:21 ` [PATCH tip/core/rcu 0/19] Miscellaneous fixes for v5.8 Andrew Morton
2020-04-15 17:32   ` Paul E. McKenney

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