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pid: Introduce helper task_is_in_init_pid_ns()

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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>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Acked-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Leo Yan 2022-01-26 13:04:26 +08:00 committed by Jakub Kicinski
parent a92f7a6fee
commit d7e4f8545b
1 changed files with 5 additions and 0 deletions
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5
include/linux/pid_namespace.h
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@ -86,4 +86,9 @@ extern struct pid_namespace *task_active_pid_ns(struct task_struct *tsk);
void pidhash_init(void); void pidhash_init(void);
void pid_idr_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 */ #endif /* _LINUX_PID_NS_H */