[PATCH v2 3/7] coresight: etm4x: Use task_is_in_init_pid_ns()

Leo Yan
2021-12-08T13:06:50Z

This patch replaces open code with task_is_in_init_pid_ns() to check if
a task is in root PID namespace.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index a0640fa5c55b..10ef2a29006e 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -1890,7 +1890,7 @@ static ssize_t ctxid_pid_show(struct device *dev,
* Don't use contextID tracing if coming from a PID namespace. See
* comment in ctxid_pid_store().
*/
- if (task_active_pid_ns(current) != &init_pid_ns)
+ if (!task_is_in_init_pid_ns(current))
return -EINVAL;

spin_lock(&drvdata->spinlock);
@@ -1918,7 +1918,7 @@ static ssize_t ctxid_pid_store(struct device *dev,
* As such refuse to use the feature if @current is not in the initial
* PID namespace.
*/
- if (task_active_pid_ns(current) != &init_pid_ns)
+ if (!task_is_in_init_pid_ns(current))
return -EINVAL;

/*
@@ -1951,7 +1951,7 @@ static ssize_t ctxid_masks_show(struct device *dev,
* Don't use contextID tracing if coming from a PID namespace. See
* comment in ctxid_pid_store().
*/
- if (task_active_pid_ns(current) != &init_pid_ns)
+ if (!task_is_in_init_pid_ns(current))
return -EINVAL;

spin_lock(&drvdata->spinlock);
@@ -1975,7 +1975,7 @@ static ssize_t ctxid_masks_store(struct device *dev,
* Don't use contextID tracing if coming from a PID namespace. See
* comment in ctxid_pid_store().
*/
- if (task_active_pid_ns(current) != &init_pid_ns)
+ if (!task_is_in_init_pid_ns(current))
return -EINVAL;

/*
--
2.25.1