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As a prerequisite to exporting cpu_hotplug_enable/cpu_hotplug_disable functions to modules we need to convert cpu_hotplug_disabled to a counter to properly support disable -> disable -> enable call sequences. E.g. after Hyper-V vmbus module (which is supposed to be the first user of exported cpu_hotplug_enable/cpu_hotplug_disable) did cpu_hotplug_disable() hibernate path calls disable_nonboot_cpus() and if we hit an error in _cpu_down() enable_nonboot_cpus() will be called on the failure path (thus making cpu_hotplug_disabled = 0 and leaving cpu hotplug in 'enabled' state). Same problem is possible if more than 1 module use cpu_hotplug_disable/cpu_hotplug_enable on their load/unload paths. When one of these modules is been unloaded it is logical to leave cpu hotplug in 'disabled' state. To support the change we need to increse cpu_hotplug_disabled counter in disable_nonboot_cpus() unconditionally as all users of disable_nonboot_cpus() are supposed to do enable_nonboot_cpus() in case an error was returned. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| powercap | ||
| regulator | ||
| 00-INDEX | ||
| apm-acpi.txt | ||
| basic-pm-debugging.txt | ||
| charger-manager.txt | ||
| devices.txt | ||
| drivers-testing.txt | ||
| freezing-of-tasks.txt | ||
| interface.txt | ||
| notifiers.txt | ||
| opp.txt | ||
| pci.txt | ||
| pm_qos_interface.txt | ||
| power_supply_class.txt | ||
| runtime_pm.txt | ||
| s2ram.txt | ||
| states.txt | ||
| suspend-and-cpuhotplug.txt | ||
| suspend-and-interrupts.txt | ||
| swsusp-and-swap-files.txt | ||
| swsusp-dmcrypt.txt | ||
| swsusp.txt | ||
| tricks.txt | ||
| userland-swsusp.txt | ||
| video.txt | ||