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resource: add helpers for fetching rlimits
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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>
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Jiri Slaby committed Jan 4, 2010
1 parent 96d07d2 commit 3e10e71
Showing 1 changed file with 22 additions and 0 deletions.
22 changes: 22 additions & 0 deletions include/linux/sched.h
Original file line number Diff line number Diff line change
Expand Up @@ -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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