linux-kernel - [PATCH tip/core/rcu 04/20] doc: rcu: Update information about resched

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Date:   Sun, 11 Nov 2018 11:56:29 -0800
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        kernel-team@...roid.com,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>
Subject: [PATCH tip/core/rcu 04/20] doc: rcu: Update information about resched_cpu

From: "Joel Fernandes (Google)" <joel@...lfernandes.org>

Since commit fced9c8cfe6b ("rcu: Avoid resched_cpu() when rescheduling
the current CPU"), resched_cpu is not directly called from
sync_sched_exp_handler. Update the documentation about the same.

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
Cc: <kernel-team@...roid.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
---
 .../Expedited-Grace-Periods/Expedited-Grace-Periods.html    | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html b/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html
index e62c7c34a369..8e4f873b979f 100644
--- a/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html
+++ b/Documentation/RCU/Design/Expedited-Grace-Periods/Expedited-Grace-Periods.html
@@ -160,9 +160,9 @@ was in flight.
 If the CPU is idle, then <tt>sync_sched_exp_handler()</tt> reports
 the quiescent state.
 
-<p>
-Otherwise, the handler invokes <tt>resched_cpu()</tt>, which forces
-a future context switch.
+<p> Otherwise, the handler forces a future context switch by setting the
+NEED_RESCHED flag of the current task's thread flag and the CPU preempt
+counter.
 At the time of the context switch, the CPU reports the quiescent state.
 Should the CPU go offline first, it will report the quiescent state
 at that time.
-- 
2.17.1