lkml.org 
[lkml]   [2008]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: CPU hotplug and IRQ affinity with 2.6.24-rt1
>>> On Mon, Feb 4, 2008 at  9:51 PM, in message
<20080205025144.GA31774@dwalker1.mvista.com>, Daniel Walker
<dwalker@dwalker1.mvista.com> wrote:
> I get the following when I tried it,
>
> BUG: sleeping function called from invalid context bash(5126) at
> kernel/rtmutex.c:638
> in_atomic():1 [00000001], irqs_disabled():1

Hi Daniel,
Can you try this patch and let me know if it fixes your problem?

-----------------------

use rcu for root-domain kfree

Signed-off-by: Gregory Haskins <ghaskins@novell.com>

diff --git a/kernel/sched.c b/kernel/sched.c
index e6ad493..77e86c1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -339,6 +339,7 @@ struct root_domain {
atomic_t refcount;
cpumask_t span;
cpumask_t online;
+ struct rcu_head rcu;

/*
* The "RT overload" flag: it gets set if a CPU has more than
@@ -6222,6 +6223,12 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent)
return 1;
}

+/* rcu callback to free a root-domain */
+static void rq_free_root(struct rcu_head *rcu)
+{
+ kfree(container_of(rcu, struct root_domain, rcu));
+}
+
static void rq_attach_root(struct rq *rq, struct root_domain *rd)
{
unsigned long flags;
@@ -6241,7 +6248,7 @@ static void rq_attach_root(struct rq *rq, struct root_domain *rd)
cpu_clear(rq->cpu, old_rd->online);

if (atomic_dec_and_test(&old_rd->refcount))
- kfree(old_rd);
+ call_rcu(&old_rd->rcu, rq_free_root);
}

atomic_inc(&rd->refcount);


\
 
 \ /
  Last update: 2008-02-05 06:11    [W:0.057 / U:0.424 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site