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authorRafael J. Wysocki <rjw@sisk.pl>2011-04-11 22:54:42 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-04-11 22:54:42 +0200
commit1f112cee07b314e244ee9e71d9c1e6950dc13327 (patch)
treee089e646c78701e37b4ebe00db36082e47cab2d5 /drivers/base/power
parentb42282e5a05018ecdc0d63a4ad530b0999785912 (diff)
PM / Hibernate: Introduce CONFIG_HIBERNATE_CALLBACKS
Xen save/restore is going to use hibernate device callbacks for quiescing devices and putting them back to normal operations and it would need to select CONFIG_HIBERNATION for this purpose. However, that also would cause the hibernate interfaces for user space to be enabled, which might confuse user space, because the Xen kernels don't support hibernation. Moreover, it would be wasteful, as it would make the Xen kernels include a substantial amount of code that they would never use. To address this issue introduce new power management Kconfig option CONFIG_HIBERNATE_CALLBACKS, such that it will only select the code that is necessary for the hibernate device callbacks to work and make CONFIG_HIBERNATION select it. Then, Xen save/restore will be able to select CONFIG_HIBERNATE_CALLBACKS without dragging the entire hibernate code along with it. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: Shriram Rajagopalan <rshriram@cs.ubc.ca>
Diffstat (limited to 'drivers/base/power')
-rw-r--r--drivers/base/power/main.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 052dc53eef3..fbc5b6e7c59 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -233,7 +233,7 @@ static int pm_op(struct device *dev,
}
break;
#endif /* CONFIG_SUSPEND */
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
case PM_EVENT_FREEZE:
case PM_EVENT_QUIESCE:
if (ops->freeze) {
@@ -260,7 +260,7 @@ static int pm_op(struct device *dev,
suspend_report_result(ops->restore, error);
}
break;
-#endif /* CONFIG_HIBERNATION */
+#endif /* CONFIG_HIBERNATE_CALLBACKS */
default:
error = -EINVAL;
}
@@ -308,7 +308,7 @@ static int pm_noirq_op(struct device *dev,
}
break;
#endif /* CONFIG_SUSPEND */
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
case PM_EVENT_FREEZE:
case PM_EVENT_QUIESCE:
if (ops->freeze_noirq) {
@@ -335,7 +335,7 @@ static int pm_noirq_op(struct device *dev,
suspend_report_result(ops->restore_noirq, error);
}
break;
-#endif /* CONFIG_HIBERNATION */
+#endif /* CONFIG_HIBERNATE_CALLBACKS */
default:
error = -EINVAL;
}