From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-kernel@vger.kernel.org
Cc: 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,
dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com,
bobby.prani@gmail.com,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: [PATCH RFC v2 tip/core/rcu 1/2] rcu: Remove cond_resched() from Tiny synchronize_sched()
Date: Sat, 14 Jan 2017 00:45:53 -0800 [thread overview]
Message-ID: <1484383554-18095-1-git-send-email-paulmck@linux.vnet.ibm.com> (raw)
In-Reply-To: <20161114183636.GA28589@linux.vnet.ibm.com@>
It is now legal to invoke synchronize_sched() at early boot, which causes
Tiny RCU's synchronize_sched() to emit spurious splats. This commit
therefore removes the cond_resched() from Tiny RCU's synchronize_sched().
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---
kernel/rcu/tiny.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/kernel/rcu/tiny.c b/kernel/rcu/tiny.c
index 1898559e6b60..b23a4d076f3d 100644
--- a/kernel/rcu/tiny.c
+++ b/kernel/rcu/tiny.c
@@ -185,9 +185,6 @@ static __latent_entropy void rcu_process_callbacks(struct softirq_action *unused
* benefits of doing might_sleep() to reduce latency.)
*
* Cool, huh? (Due to Josh Triplett.)
- *
- * But we want to make this a static inline later. The cond_resched()
- * currently makes this problematic.
*/
void synchronize_sched(void)
{
@@ -195,7 +192,6 @@ void synchronize_sched(void)
lock_is_held(&rcu_lock_map) ||
lock_is_held(&rcu_sched_lock_map),
"Illegal synchronize_sched() in RCU read-side critical section");
- cond_resched();
}
EXPORT_SYMBOL_GPL(synchronize_sched);
--
2.5.2
next parent reply other threads:[~2017-01-14 8:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20161114183636.GA28589@linux.vnet.ibm.com@>
2017-01-14 8:45 ` Paul E. McKenney [this message]
2017-01-14 8:45 ` [PATCH RFC v2 tip/core/rcu 2/2] rcu: Narrow early boot window of illegal synchronous grace periods Paul E. McKenney
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