tree 3641a25b7356da1bdcb52f6ff160f605ed778cd4
parent 2655d57ef35aa327a2e58a1c5dc7b65c65003f4e
author Eric Dumazet <eric.dumazet@gmail.com> 1303968225 +0200
committer Paul E. McKenney <paulmck@linux.vnet.ibm.com> 1304662619 -0700

rcu: optimize rcutiny

rcu_sched_qs() currently calls local_irq_save()/local_irq_restore() up
to three times.

Remove irq masking from rcu_qsctr_help() / invoke_rcu_kthread()
and do it once in rcu_sched_qs() / rcu_bh_qs()

This generates smaller code as well.

   text	   data	    bss	    dec	    hex	filename
   2314	    156	     24	   2494	    9be	kernel/rcutiny.old.o
   2250	    156	     24	   2430	    97e	kernel/rcutiny.new.o

Fix an outdated comment for rcu_qsctr_help()
Move invoke_rcu_kthread() definition before its use.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>