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| author | Len Brown <len.brown@intel.com> | 2009-08-02 18:10:02 +0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-08-02 18:10:02 +0200 |
| commit | 6a61487791a8b8f85542c51132e8c7ed9bc7fd0b (patch) | |
| tree | b8e090711245de8208d4af5789d45f96848e5adb /drivers/acpi | |
| parent | Merge branch 'thinkpad' into release (diff) | |
| parent | ACPI: bind workqueues to CPU 0 to avoid SMI corruption (diff) | |
| download | linux-6a61487791a8b8f85542c51132e8c7ed9bc7fd0b.tar.xz linux-6a61487791a8b8f85542c51132e8c7ed9bc7fd0b.zip | |
Merge branch 'bugzilla-13751' into release
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/osl.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 71670719d61a..5691f165a952 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -189,11 +189,36 @@ acpi_status __init acpi_os_initialize(void) return AE_OK; } +static void bind_to_cpu0(struct work_struct *work) +{ + set_cpus_allowed(current, cpumask_of_cpu(0)); + kfree(work); +} + +static void bind_workqueue(struct workqueue_struct *wq) +{ + struct work_struct *work; + + work = kzalloc(sizeof(struct work_struct), GFP_KERNEL); + INIT_WORK(work, bind_to_cpu0); + queue_work(wq, work); +} + acpi_status acpi_os_initialize1(void) { + /* + * On some machines, a software-initiated SMI causes corruption unless + * the SMI runs on CPU 0. An SMI can be initiated by any AML, but + * typically it's done in GPE-related methods that are run via + * workqueues, so we can avoid the known corruption cases by binding + * the workqueues to CPU 0. + */ kacpid_wq = create_singlethread_workqueue("kacpid"); + bind_workqueue(kacpid_wq); kacpi_notify_wq = create_singlethread_workqueue("kacpi_notify"); + bind_workqueue(kacpi_notify_wq); kacpi_hotplug_wq = create_singlethread_workqueue("kacpi_hotplug"); + bind_workqueue(kacpi_hotplug_wq); BUG_ON(!kacpid_wq); BUG_ON(!kacpi_notify_wq); BUG_ON(!kacpi_hotplug_wq); |