resource: add helpers for fetching rlimits (3e10e716) · Commits · 戴 / test

We want to be sure that compiler fetches the limit variable only once, so add helpers for fetching current and maximal resource limits which do that. Add them to sched.h (instead of resource.h) due to circular dependency sched.h->resource.h->task_struct Alternative would be to create a separate res_access.h or similar. Signed-off-by:

Jiri Slaby <jslaby@suse.cz> Cc: James Morris <jmorris@namei.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@elte.hu>

include/linux/sched.h

+22 −0

Original line number	Diff line number	Diff line
		@@ -2601,6 +2601,28 @@ static inline void mm_init_owner(struct mm_struct mm, struct task_struct p)
		}
		#endif /* CONFIG_MM_OWNER */

		static inline unsigned long task_rlimit(const struct task_struct *tsk,
		unsigned int limit)
		{
		return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur);
		}

		static inline unsigned long task_rlimit_max(const struct task_struct *tsk,
		unsigned int limit)
		{
		return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max);
		}

		static inline unsigned long rlimit(unsigned int limit)
		{
		return task_rlimit(current, limit);
		}

		static inline unsigned long rlimit_max(unsigned int limit)
		{
		return task_rlimit_max(current, limit);
		}

		#endif /* __KERNEL__ */

		#endif

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