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| author | Thomas Gleixner <tglx@linutronix.de> | 2009-12-09 10:14:58 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-14 17:11:34 +0100 |
| commit | 5fe85be081edf0ac92d83f9c39e0ab5c1371eb82 (patch) | |
| tree | 6c8d313aec92310787c14b7d289f69e3e5e38711 /usr | |
| parent | 663997d417330a59a566452f52cfa04c8ffd190b (diff) | |
| download | blackbird-op-linux-5fe85be081edf0ac92d83f9c39e0ab5c1371eb82.tar.gz blackbird-op-linux-5fe85be081edf0ac92d83f9c39e0ab5c1371eb82.zip | |
sched: Use rcu in sys_sched_getscheduler/sys_sched_getparam()
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>
Diffstat (limited to 'usr')
0 files changed, 0 insertions, 0 deletions
