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authorChristoph Lameter <cl@linux.com>2014-08-26 19:12:21 -0500
committerTejun Heo <tj@kernel.org>2014-08-28 08:58:57 -0400
commit4ba2968420fa9d0604b6a6a5c61bfa8d0fa84ae0 (patch)
treea1051b2a4a23ae8f943f3ae97c0adf6b594e2df0 /kernel/sched
parent23f66e2d661b4d3226d16e25910a9e9472ce2410 (diff)
downloadop-kernel-dev-4ba2968420fa9d0604b6a6a5c61bfa8d0fa84ae0.zip
op-kernel-dev-4ba2968420fa9d0604b6a6a5c61bfa8d0fa84ae0.tar.gz
percpu: Resolve ambiguities in __get_cpu_var/cpumask_var_t
__get_cpu_var can paper over differences in the definitions of cpumask_var_t and either use the address of the cpumask variable directly or perform a fetch of the address of the struct cpumask allocated elsewhere. This is important particularly when using per cpu cpumask_var_t declarations because in one case we have an offset into a per cpu area to handle and in the other case we need to fetch a pointer from the offset. This patch introduces a new macro this_cpu_cpumask_var_ptr() that is defined where cpumask_var_t is defined and performs the proper actions. All use cases where __get_cpu_var is used with cpumask_var_t are converted to the use of this_cpu_cpumask_var_ptr(). Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/deadline.c2
-rw-r--r--kernel/sched/fair.c2
-rw-r--r--kernel/sched/rt.c2
3 files changed, 3 insertions, 3 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 255ce13..4a608cf 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1158,7 +1158,7 @@ static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask_dl);
static int find_later_rq(struct task_struct *task)
{
struct sched_domain *sd;
- struct cpumask *later_mask = __get_cpu_var(local_cpu_mask_dl);
+ struct cpumask *later_mask = this_cpu_cpumask_var_ptr(local_cpu_mask_dl);
int this_cpu = smp_processor_id();
int best_cpu, cpu = task_cpu(task);
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bfa3c86..197d659 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6539,7 +6539,7 @@ static int load_balance(int this_cpu, struct rq *this_rq,
struct sched_group *group;
struct rq *busiest;
unsigned long flags;
- struct cpumask *cpus = __get_cpu_var(load_balance_mask);
+ struct cpumask *cpus = this_cpu_cpumask_var_ptr(load_balance_mask);
struct lb_env env = {
.sd = sd,
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 5f6edca..a4c50fc 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1526,7 +1526,7 @@ static DEFINE_PER_CPU(cpumask_var_t, local_cpu_mask);
static int find_lowest_rq(struct task_struct *task)
{
struct sched_domain *sd;
- struct cpumask *lowest_mask = __get_cpu_var(local_cpu_mask);
+ struct cpumask *lowest_mask = this_cpu_cpumask_var_ptr(local_cpu_mask);
int this_cpu = smp_processor_id();
int cpu = task_cpu(task);
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