int in_suspend __nosavedata = 0;
-#ifdef CONFIG_HIGHMEM
-unsigned int count_highmem_pages(void);
-int restore_highmem(void);
-#else
-static inline int restore_highmem(void) { return 0; }
-static inline unsigned int count_highmem_pages(void) { return 0; }
-#endif
-
/**
* The following functions are used for tracing the allocated
* swap pages, so that they can be freed in case of an error.
return 0;
}
-
-int swsusp_suspend(void)
-{
- int error;
-
- if ((error = arch_prepare_suspend()))
- return error;
-
- local_irq_disable();
- /* At this point, device_suspend() has been called, but *not*
- * device_power_down(). We *must* device_power_down() now.
- * Otherwise, drivers for some devices (e.g. interrupt controllers)
- * become desynchronized with the actual state of the hardware
- * at resume time, and evil weirdness ensues.
- */
- if ((error = device_power_down(PMSG_FREEZE))) {
- printk(KERN_ERR "Some devices failed to power down, aborting suspend\n");
- goto Enable_irqs;
- }
-
- save_processor_state();
- if ((error = swsusp_arch_suspend()))
- printk(KERN_ERR "Error %d suspending\n", error);
- /* Restore control flow magically appears here */
- restore_processor_state();
- /* NOTE: device_power_up() is just a resume() for devices
- * that suspended with irqs off ... no overall powerup.
- */
- device_power_up();
- Enable_irqs:
- local_irq_enable();
- return error;
-}
-
-int swsusp_resume(void)
-{
- int error;
-
- local_irq_disable();
- /* NOTE: device_power_down() is just a suspend() with irqs off;
- * it has no special "power things down" semantics
- */
- if (device_power_down(PMSG_PRETHAW))
- printk(KERN_ERR "Some devices failed to power down, very bad\n");
- /* We'll ignore saved state, but this gets preempt count (etc) right */
- save_processor_state();
- error = restore_highmem();
- if (!error) {
- error = swsusp_arch_resume();
- /* The code below is only ever reached in case of a failure.
- * Otherwise execution continues at place where
- * swsusp_arch_suspend() was called
- */
- BUG_ON(!error);
- /* This call to restore_highmem() undos the previous one */
- restore_highmem();
- }
- /* The only reason why swsusp_arch_resume() can fail is memory being
- * very tight, so we have to free it as soon as we can to avoid
- * subsequent failures
- */
- swsusp_free();
- restore_processor_state();
- touch_softlockup_watchdog();
- device_power_up();
- local_irq_enable();
- return error;
-}