diff options
| author | Olof Johansson <olof@lixom.net> | 2013-11-15 15:17:59 -0800 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2013-11-15 15:17:59 -0800 |
| commit | 6886059f2ef5d62c73e87a905e84fa4f87d56074 (patch) | |
| tree | dfe6e1611d7c50057df52db7b55eafbfb8e33a93 /kernel/cpu.c | |
| parent | ca439c9b983ffa14e9eae6030e3ee80ad039388f (diff) | |
| parent | 26273e02a0cf18eb72416559310d3294390a9024 (diff) | |
Merge tag 'omap-for-v3.13/fixes-for-merge-window-take2' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap into fixes
Few clock fixes, a runtime PM fix, and pinctrl-single fix along
with few other fixes that popped up during the merge window.
* tag 'omap-for-v3.13/fixes-for-merge-window-take2' of git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-omap:
ARM: OMAP2+: Fix build for dra7xx without omap4 and 5
ARM: OMAP2+: omap_device: maintain sane runtime pm status around suspend/resume
doc: devicetree: Add bindings documentation for omap-des driver
ARM: dts: doc: Document missing compatible property for omap-sham driver
ARM: OMAP3: Beagle: fix return value check in beagle_opp_init()
ARM: OMAP: devicetree: fix SPI node compatible property syntax items
pinctrl: single: call pcs_soc->rearm() whenever IRQ mask is changed
ARM: OMAP2+: smsc911x: fix return value check in gpmc_smsc911x_init()
+ sync with newer trunk
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index d7f07a2da5a..63aa50d7ce1 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -308,6 +308,23 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) } smpboot_park_threads(cpu); + /* + * By now we've cleared cpu_active_mask, wait for all preempt-disabled + * and RCU users of this state to go away such that all new such users + * will observe it. + * + * For CONFIG_PREEMPT we have preemptible RCU and its sync_rcu() might + * not imply sync_sched(), so explicitly call both. + */ +#ifdef CONFIG_PREEMPT + synchronize_sched(); +#endif + synchronize_rcu(); + + /* + * So now all preempt/rcu users must observe !cpu_active(). + */ + err = __stop_machine(take_cpu_down, &tcd_param, cpumask_of(cpu)); if (err) { /* CPU didn't die: tell everyone. Can't complain. */ |