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authorSteffen Klassert <steffen.klassert@secunet.com>2010-07-07 15:30:47 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2010-07-14 20:29:29 +0800
commitee836555120140f770005b8ce6673c913d1b9a98 (patch)
tree73f62f460c8b18997a76cf38e7f5021086558c56 /kernel/padata.c
parent4c879170296174bde05cd1c643dac16594edee77 (diff)
downloadlwn-ee836555120140f770005b8ce6673c913d1b9a98.tar.gz
lwn-ee836555120140f770005b8ce6673c913d1b9a98.zip
padata: Block until the instance is unused on stop
This patch makes padata_stop to block until the padata instance is unused. Also we split padata_stop to a locked and a unlocked version. This is in preparation to be able to change the cpumask after a call to patata stop. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'kernel/padata.c')
-rw-r--r--kernel/padata.c24
1 files changed, 16 insertions, 8 deletions
diff --git a/kernel/padata.c b/kernel/padata.c
index e7d723a3e31d..9e18dfa372a9 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -490,6 +490,20 @@ static void __padata_start(struct padata_instance *pinst)
pinst->flags |= PADATA_INIT;
}
+static void __padata_stop(struct padata_instance *pinst)
+{
+ if (!(pinst->flags & PADATA_INIT))
+ return;
+
+ pinst->flags &= ~PADATA_INIT;
+
+ synchronize_rcu();
+
+ get_online_cpus();
+ padata_flush_queues(pinst->pd);
+ put_online_cpus();
+}
+
/* Replace the internal control stucture with a new one. */
static void padata_replace(struct padata_instance *pinst,
struct parallel_data *pd_new)
@@ -649,7 +663,7 @@ EXPORT_SYMBOL(padata_start);
void padata_stop(struct padata_instance *pinst)
{
mutex_lock(&pinst->lock);
- pinst->flags &= ~PADATA_INIT;
+ __padata_stop(pinst);
mutex_unlock(&pinst->lock);
}
EXPORT_SYMBOL(padata_stop);
@@ -770,17 +784,11 @@ EXPORT_SYMBOL(padata_alloc);
*/
void padata_free(struct padata_instance *pinst)
{
- padata_stop(pinst);
-
- synchronize_rcu();
-
#ifdef CONFIG_HOTPLUG_CPU
unregister_hotcpu_notifier(&pinst->cpu_notifier);
#endif
- get_online_cpus();
- padata_flush_queues(pinst->pd);
- put_online_cpus();
+ padata_stop(pinst);
padata_free_pd(pinst->pd);
free_cpumask_var(pinst->cpumask);
kfree(pinst);