mirror of https://gitee.com/openkylin/linux.git
[PATCH] Drop tasklist lock in do_sched_setscheduler
There is no need to hold tasklist_lock across the setscheduler call, when we pin the task structure with get_task_struct(). Interrupts are disabled in setscheduler anyway and the permission checks do not need interrupts disabled. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -4091,8 +4091,10 @@ do_sched_setscheduler(pid_t pid, int policy, struct sched_param __user *param)
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read_unlock_irq(&tasklist_lock);
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return -ESRCH;
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}
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retval = sched_setscheduler(p, policy, &lparam);
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get_task_struct(p);
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read_unlock_irq(&tasklist_lock);
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retval = sched_setscheduler(p, policy, &lparam);
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put_task_struct(p);
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return retval;
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}
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