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| author | Nicholas Mc Guire <der.herr@hofr.at> | 2013-12-05 23:42:22 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-05-14 18:38:54 (GMT) |
| commit | c572d8fb112e6108cb6a805e5d88eff0f5d23f8d (patch) | |
| tree | 9f31f615a884cdceee33f31690ad2c373d15b053 /init | |
| parent | 4e3b7fdfae081c6bdf8dbc5c064669e68e90c642 (diff) | |
| download | linux-fsl-qoriq-c572d8fb112e6108cb6a805e5d88eff0f5d23f8d.tar.xz | |
softirq: make migrate disable/enable conditioned on softirq_nestcnt transition
This patch removes the recursive calls to migrate_disable/enable in
local_bh_disable/enable
the softirq-local-lock.patch introduces local_bh_disable/enable wich
decrements/increments the current->softirq_nestcnt and disable/enables
migration as well. as softirq_nestcnt (include/linux/sched.h conditioned
on CONFIG_PREEMPT_RT_BASE) already is tracking the nesting level of the
recursive calls to local_bh_disable/enable (all in kernel/softirq.c) - no
need to do it twice.
migrate_disable/enable thus can be conditionsed on softirq_nestcnt making
a transition from 0-1 to disable migration and 1-0 to re-enable it.
No change of functional behavior, this does noticably reduce the observed
nesting level of migrate_disable/enable
Signed-off-by: Nicholas Mc Guire <der.herr@hofr.at>
Reviewed-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions