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316c1608d1
ACCESS_ONCE doesn't work reliably on non-scalar types. This patch removes the rest of the existing usages of ACCESS_ONCE() in the scheduler, and use the new READ_ONCE() and WRITE_ONCE() APIs as appropriate. Signed-off-by: Jason Low <jason.low2@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Waiman Long <Waiman.Long@hp.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Aswin Chandramouleeswaran <aswin@hp.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Mike Galbraith <umgwanakikbuti@gmail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1430251224-5764-2-git-send-email-jason.low2@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
#ifdef CONFIG_SCHED_AUTOGROUP
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#include <linux/kref.h>
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#include <linux/rwsem.h>
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struct autogroup {
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/*
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* reference doesn't mean how many thread attach to this
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* autogroup now. It just stands for the number of task
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* could use this autogroup.
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*/
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struct kref kref;
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struct task_group *tg;
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struct rw_semaphore lock;
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unsigned long id;
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int nice;
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};
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extern void autogroup_init(struct task_struct *init_task);
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extern void autogroup_free(struct task_group *tg);
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static inline bool task_group_is_autogroup(struct task_group *tg)
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{
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return !!tg->autogroup;
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}
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extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
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static inline struct task_group *
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autogroup_task_group(struct task_struct *p, struct task_group *tg)
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{
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int enabled = READ_ONCE(sysctl_sched_autogroup_enabled);
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if (enabled && task_wants_autogroup(p, tg))
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return p->signal->autogroup->tg;
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return tg;
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}
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extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
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#else /* !CONFIG_SCHED_AUTOGROUP */
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static inline void autogroup_init(struct task_struct *init_task) { }
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static inline void autogroup_free(struct task_group *tg) { }
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static inline bool task_group_is_autogroup(struct task_group *tg)
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{
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return 0;
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}
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static inline struct task_group *
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autogroup_task_group(struct task_struct *p, struct task_group *tg)
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{
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return tg;
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}
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#ifdef CONFIG_SCHED_DEBUG
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static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
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{
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return 0;
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}
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#endif
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#endif /* CONFIG_SCHED_AUTOGROUP */
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