Re: [PATCH] kthread: convert stop_machine into a kthread

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Quoting Andrew Morton ([email protected]):
> OK.  But if we're going to convert to the kthread API then stopmachine()
> really whould be switched to the more efficient kthread_bind().

Ah, like so?

Rusty, do you feel this makes the conversion less of a step backward?
If not, Andrew, as Rusty pointed out, stop_machine.c does not fall into
the set of kernel_thread users which need to be updated either for the
deprecation or to deal with pid namespaces, and perhaps my previous
patch should not be applied after all.


From: Serge E. Hallyn <[email protected]>
Date: Tue, 20 Jun 2006 03:17:44 -0500
Subject: [PATCH] kthread: convert stop_machine to use kthread_bind

Convert stop_machine to use the more efficient kthread_bind()
in place of set_cpus_allowed().

Signed-off-by: Serge E. Hallyn <[email protected]>


 kernel/stop_machine.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 2dd5a48..a462deb 100644
--- a/kernel/stop_machine.c
+++ b/kernel/stop_machine.c
@@ -31,7 +31,7 @@ static int stopmachine(void *cpu)
 	int irqs_disabled = 0;
 	int prepared = 0;
-	set_cpus_allowed(current, cpumask_of_cpu((int)(long)cpu));
+	kthread_bind(current, (unsigned int)(long)cpu);
 	/* Ack: we are alive */
 	smp_mb(); /* Theoretically the ack = 0 might not be on this CPU yet. */

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