padata_set_cpumask needs to be protected by a lock. We make
__padata_set_cpumasks unlocked and static. So this function
can be used by the exported and locked padata_set_cpumask and
padata_set_cpumasks functions.
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
---
include/linux/padata.h | 6 +-
kernel/padata.c | 117 +++++++++++++++++++++++++++--------------------
2 files changed, 70 insertions(+), 53 deletions(-)
diff --git a/include/linux/padata.h b/include/linux/padata.h
index 71dfc9d..bb0fc5d 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -178,9 +178,9 @@ extern int padata_get_cpumask(struct padata_instance *pinst,
int cpumask_type, struct cpumask *out_mask);
extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
cpumask_var_t cpumask);
-extern int __padata_set_cpumasks(struct padata_instance *pinst,
- cpumask_var_t pcpumask,
- cpumask_var_t cbcpumask);
+extern int padata_set_cpumasks(struct padata_instance *pinst,
+ cpumask_var_t pcpumask,
+ cpumask_var_t cbcpumask);
extern int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask);
extern int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask);
extern int padata_start(struct padata_instance *pinst);
diff --git a/kernel/padata.c b/kernel/padata.c
index 12860bc..4987203 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -623,6 +623,66 @@ int padata_get_cpumask(struct padata_instance *pinst,
}
EXPORT_SYMBOL(padata_get_cpumask);
+static int __padata_set_cpumasks(struct padata_instance *pinst,
+ cpumask_var_t pcpumask,
+ cpumask_var_t cbcpumask)
+{
+ int valid;
+ struct parallel_data *pd;
+
+ valid = padata_validate_cpumask(pinst, pcpumask);
+ if (!valid) {
+ __padata_stop(pinst);
+ goto out_replace;
+ }
+
+ valid = padata_validate_cpumask(pinst, cbcpumask);
+ if (!valid)
+ __padata_stop(pinst);
+
+out_replace:
+ pd = padata_alloc_pd(pinst, pcpumask, cbcpumask);
+ if (!pd)
+ return -ENOMEM;
+
+ cpumask_copy(pinst->cpumask.pcpu, pcpumask);
+ cpumask_copy(pinst->cpumask.cbcpu, cbcpumask);
+
+ padata_replace(pinst, pd);
+
+ if (valid)
+ __padata_start(pinst);
+
+ return 0;
+}
+
+/**
+ * padata_set_cpumasks - Set both parallel and serial cpumasks. The first
+ * one is used by parallel workers and the second one
+ * by the wokers doing serialization.
+ *
+ * @pinst: padata instance
+ * @pcpumask: the cpumask to use for parallel workers
+ * @cbcpumask: the cpumsak to use for serial workers
+ */
+int padata_set_cpumasks(struct padata_instance *pinst, cpumask_var_t pcpumask,
+ cpumask_var_t cbcpumask)
+{
+ int err;
+
+ mutex_lock(&pinst->lock);
+ get_online_cpus();
+
+ err = __padata_set_cpumasks(pinst, pcpumask, cbcpumask);
+
+ put_online_cpus();
+ mutex_unlock(&pinst->lock);
+
+ return err;
+
+}
+EXPORT_SYMBOL(padata_set_cpumasks);
+
/**
* padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value
* equivalent to @cpumask.
@@ -636,6 +696,10 @@ int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
cpumask_var_t cpumask)
{
struct cpumask *serial_mask, *parallel_mask;
+ int err = -EINVAL;
+
+ mutex_lock(&pinst->lock);
+ get_online_cpus();
switch (cpumask_type) {
case PADATA_CPU_PARALLEL:
@@ -647,65 +711,18 @@ int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
serial_mask = cpumask;
break;
default:
- return -EINVAL;
+ goto out;
}
- return __padata_set_cpumasks(pinst, parallel_mask, serial_mask);
-}
-EXPORT_SYMBOL(padata_set_cpumask);
-
-/**
- * __padata_set_cpumasks - Set both parallel and serial cpumasks. The first
- * one is used by parallel workers and the second one
- * by the wokers doing serialization.
- *
- * @pinst: padata instance
- * @pcpumask: the cpumask to use for parallel workers
- * @cbcpumask: the cpumsak to use for serial workers
- */
-int __padata_set_cpumasks(struct padata_instance *pinst,
- cpumask_var_t pcpumask, cpumask_var_t cbcpumask)
-{
- int valid;
- int err = 0;
- struct parallel_data *pd = NULL;
-
- mutex_lock(&pinst->lock);
- get_online_cpus();
-
- valid = padata_validate_cpumask(pinst, pcpumask);
- if (!valid) {
- __padata_stop(pinst);
- goto out_replace;
- }
-
- valid = padata_validate_cpumask(pinst, cbcpumask);
- if (!valid)
- __padata_stop(pinst);
-
-out_replace:
- pd = padata_alloc_pd(pinst, pcpumask, cbcpumask);
- if (!pd) {
- err = -ENOMEM;
- goto out;
- }
-
- cpumask_copy(pinst->cpumask.pcpu, pcpumask);
- cpumask_copy(pinst->cpumask.cbcpu, cbcpumask);
-
- padata_replace(pinst, pd);
-
- if (valid)
- __padata_start(pinst);
+ err = __padata_set_cpumasks(pinst, parallel_mask, serial_mask);
out:
put_online_cpus();
mutex_unlock(&pinst->lock);
return err;
-
}
-EXPORT_SYMBOL(__padata_set_cpumasks);
+EXPORT_SYMBOL(padata_set_cpumask);
static int __padata_add_cpu(struct padata_instance *pinst, int cpu)
{
--
1.5.6.5
--
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