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    SubjectRe: [PATCH v2 1/7] pid: Introduce helper task_is_in_init_pid_ns()
    On Wed, Dec 08, 2021 at 04:33:14PM +0800, Leo Yan wrote:
    > Currently the kernel uses open code in multiple places to check if a
    > task is in the root PID namespace with the kind of format:
    >
    > if (task_active_pid_ns(current) == &init_pid_ns)
    > do_something();
    >
    > This patch creates a new helper function, task_is_in_init_pid_ns(), it
    > returns true if a passed task is in the root PID namespace, otherwise
    > returns false. So it will be used to replace open codes.
    >
    > Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
    > Signed-off-by: Leo Yan <leo.yan@linaro.org>
    > ---
    > include/linux/pid_namespace.h | 5 +++++
    > 1 file changed, 5 insertions(+)
    >
    > diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
    > index 7c7e627503d2..07481bb87d4e 100644
    > --- a/include/linux/pid_namespace.h
    > +++ b/include/linux/pid_namespace.h
    > @@ -86,4 +86,9 @@ extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
    > void pidhash_init(void);
    > void pid_idr_init(void);
    >
    > +static inline bool task_is_in_init_pid_ns(struct task_struct *tsk)
    > +{
    > + return task_active_pid_ns(tsk) == &init_pid_ns;
    > +}
    > +
    > #endif /* _LINUX_PID_NS_H */
    > --
    > 2.25.1
    >

    Acked-by: Balbir Singh <bsingharora@gmail.com>

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