From:   Leo Yan <leo.yan@linaro.org>
To:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Mike Leach <mike.leach@linaro.org>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jan Harkes <jaharkes@cs.cmu.edu>, coda@cs.cmu.edu,
        Paul Moore <paul@paul-moore.com>,
        Eric Paris <eparis@redhat.com>,
        Balbir Singh <bsingharora@gmail.com>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, coresight@lists.linaro.org,
        linux-arm-kernel@lists.infradead.org, codalist@coda.cs.cmu.edu,
        linux-audit@redhat.com
Cc:     Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v1 2/7] coresight: etm3x: Use task_is_in_root_ns() to check PID namespace
Date:   Sun,  5 Dec 2021 22:51:00 +0800
Message-Id: <20211205145105.57824-3-leo.yan@linaro.org>
In-Reply-To: <20211205145105.57824-1-leo.yan@linaro.org>
References: <20211205145105.57824-1-leo.yan@linaro.org>
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This patch uses helper task_is_in_root_ns() to replace open code for
checking if a task is in root PID namespace.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 drivers/hwtracing/coresight/coresight-etm3x-sysfs.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
index e8c7649f123e..baba16ad9bb1 100644
--- a/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm3x-sysfs.c
@@ -1030,7 +1030,7 @@ 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_root_ns(current))
 		return -EINVAL;
 
 	spin_lock(&drvdata->spinlock);
@@ -1058,7 +1058,7 @@ 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_root_ns(current))
 		return -EINVAL;
 
 	ret = kstrtoul(buf, 16, &pid);
@@ -1084,7 +1084,7 @@ static ssize_t ctxid_mask_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_root_ns(current))
 		return -EINVAL;
 
 	val = config->ctxid_mask;
@@ -1104,7 +1104,7 @@ static ssize_t ctxid_mask_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_root_ns(current))
 		return -EINVAL;
 
 	ret = kstrtoul(buf, 16, &val);
-- 
2.25.1