Commit d7e4f854 authored by Leo Yan's avatar Leo Yan Committed by Jakub Kicinski
Browse files

pid: Introduce helper task_is_in_init_pid_ns() 



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: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: default avatarLeo Yan <leo.yan@linaro.org>
Reviewed-by: default avatarLeon Romanovsky <leonro@nvidia.com>
Acked-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: default avatarBalbir Singh <bsingharora@gmail.com>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent a92f7a6f

include/linux/pid_namespace.h

+5 −0
Original line number Diff line number Diff line
@@ -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 */