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[PATCH] suspend/resume SMP support

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Using CPU hotplug to support suspend/resume SMP.  Both S3 and S4 use
disable/enable_nonboot_cpus API.  The S4 part is based on Pavel's original S4
SMP patch.

Signed-off-by: Li Shaohua<shaohua.li@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Li Shaohua
2005-06-25 14:55:06 -07:00
committed by Linus Torvalds
parent fb69c3907e
commit 5a72e04df5
13 changed files with 80 additions and 90 deletions
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16
kernel/power/main.c
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@ -55,6 +55,13 @@ static int suspend_prepare(suspend_state_t state)
pm_prepare_console();
disable_nonboot_cpus();
if (num_online_cpus() != 1) {
error = -EPERM;
goto Enable_cpu;
}
if (freeze_processes()) {
error = -EAGAIN;
goto Thaw;
@ -75,6 +82,8 @@ static int suspend_prepare(suspend_state_t state)
pm_ops->finish(state);
Thaw:
thaw_processes();
Enable_cpu:
enable_nonboot_cpus();
pm_restore_console();
return error;
}
@ -113,6 +122,7 @@ static void suspend_finish(suspend_state_t state)
if (pm_ops && pm_ops->finish)
pm_ops->finish(state);
thaw_processes();
enable_nonboot_cpus();
pm_restore_console();
}
@ -150,12 +160,6 @@ static int enter_state(suspend_state_t state)
goto Unlock;
}
/* Suspend is hard to get right on SMP. */
if (num_online_cpus() != 1) {
error = -EPERM;
goto Unlock;
}
pr_debug("PM: Preparing system for %s sleep\n", pm_states[state]);
if ((error = suspend_prepare(state)))
goto Unlock;