sched: Use rcu in sys_sched_getscheduler/sys_sched_getparam()

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read_lock(&tasklist_lock) does not protect
sys_sched_getscheduler and sys_sched_getparam() against a
concurrent update of the policy or scheduler parameters as
do_sched_setscheduler() does not take the tasklist_lock. The
accessed integers can be retrieved w/o locking and are snapshots
anyway.

Using rcu_read_lock() to protect find_task_by_vpid() and prevent
the task struct from going away is not changing the above
situation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20091209100706.753790977@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Thomas Gleixner 2009-12-09 10:14:58 +00:00 • committed by Ingo Molnar

parent 663997d417

commit 5fe85be081

1 changed files with 5 additions and 5 deletions

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kernel/sched.c

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