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| author | Paul E. McKenney <[email protected]> | 2011-07-17 09:05:49 +0000 |
|---|---|---|
| committer | Paul E. McKenney <[email protected]> | 2011-07-20 04:38:51 +0000 |
| commit | 131906b0062ddde7f85bbe67754983c754648bd8 (patch) | |
| tree | 1b92eacb707befb294b4d9985f10aa44715cba16 /security/selinux/hooks.c | |
| parent | rcu: Prevent RCU callbacks from executing before scheduler initialized (diff) | |
| download | kernel-131906b0062ddde7f85bbe67754983c754648bd8.tar.gz kernel-131906b0062ddde7f85bbe67754983c754648bd8.zip | |
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 <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Diffstat (limited to 'security/selinux/hooks.c')
0 files changed, 0 insertions, 0 deletions