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| author | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-07-17 02:05:49 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2011-07-19 21:38:51 -0700 |
| commit | 131906b0062ddde7f85bbe67754983c754648bd8 (patch) | |
| tree | 1b92eacb707befb294b4d9985f10aa44715cba16 /kernel/sched_idletask.c | |
| parent | b0d304172f49061b4ff78f9e2b02719ac69c8a7e (diff) | |
| download | linux-131906b0062ddde7f85bbe67754983c754648bd8.tar.bz2 | |
rcu: decrease rcu_report_exp_rnp coupling with scheduler
PREEMPT_RCU read-side critical sections blocking an expedited grace
period invoke rcu_report_exp_rnp(). When the last such critical section
has completed, rcu_report_exp_rnp() invokes the scheduler to wake up the
task that invoked synchronize_rcu_expedited() -- needlessly holding the
root rcu_node structure's lock while doing so, thus needlessly providing
a way for RCU and the scheduler to deadlock.
This commit therefore releases the root rcu_node structure's lock before
calling wake_up().
Reported-by: Ed Tomlinson <edt@aei.ca>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'kernel/sched_idletask.c')
0 files changed, 0 insertions, 0 deletions