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>

5 files changed, 16 insertions, 16 deletions

diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c
index 8210405..7025593 100644
--- a/drivers/amba/bus.c
+++ b/drivers/amba/bus.c
@@ -214,7 +214,7 @@ static int amba_pm_resume_noirq(struct device *dev)
 
 #endif /* !CONFIG_SUSPEND */
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 
 static int amba_pm_freeze(struct device *dev)
 {
@@ -352,7 +352,7 @@ static int amba_pm_restore_noirq(struct device *dev)
 	return ret;
 }
 
-#else /* !CONFIG_HIBERNATION */
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define amba_pm_freeze		NULL
 #define amba_pm_thaw		NULL
@@ -363,7 +363,7 @@ static int amba_pm_restore_noirq(struct device *dev)
 #define amba_pm_poweroff_noirq	NULL
 #define amba_pm_restore_noirq	NULL
 
-#endif /* !CONFIG_HIBERNATION */
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #ifdef CONFIG_PM
 
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index f051cff..9279231 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -771,7 +771,7 @@ int __weak platform_pm_resume_noirq(struct device *dev)
 
 #endif /* !CONFIG_SUSPEND */
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 
 static int platform_pm_freeze(struct device *dev)
 {
@@ -909,7 +909,7 @@ static int platform_pm_restore_noirq(struct device *dev)
 	return ret;
 }
 
-#else /* !CONFIG_HIBERNATION */
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define platform_pm_freeze		NULL
 #define platform_pm_thaw		NULL
@@ -920,7 +920,7 @@ static int platform_pm_restore_noirq(struct device *dev)
 #define platform_pm_poweroff_noirq	NULL
 #define platform_pm_restore_noirq	NULL
 
-#endif /* !CONFIG_HIBERNATION */
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #ifdef CONFIG_PM_RUNTIME
 
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 052dc53..fbc5b6e 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;
 	}
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index d86ea8b..135df16 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -781,7 +781,7 @@ static int pci_pm_resume(struct device *dev)
 
 #endif /* !CONFIG_SUSPEND */
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 
 static int pci_pm_freeze(struct device *dev)
 {
@@ -970,7 +970,7 @@ static int pci_pm_restore(struct device *dev)
 	return error;
 }
 
-#else /* !CONFIG_HIBERNATION */
+#else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define pci_pm_freeze		NULL
 #define pci_pm_freeze_noirq	NULL
@@ -981,7 +981,7 @@ static int pci_pm_restore(struct device *dev)
 #define pci_pm_restore		NULL
 #define pci_pm_restore_noirq	NULL
 
-#endif /* !CONFIG_HIBERNATION */
+#endif /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #ifdef CONFIG_PM_RUNTIME
 
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 95143dd..1ac9412 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -61,7 +61,7 @@ static void xen_post_suspend(int cancelled)
 	xen_mm_unpin_all();
 }
 
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 static int xen_suspend(void *data)
 {
 	struct suspend_info *si = data;
@@ -173,7 +173,7 @@ out:
 #endif
 	shutting_down = SHUTDOWN_INVALID;
 }
-#endif	/* CONFIG_HIBERNATION */
+#endif	/* CONFIG_HIBERNATE_CALLBACKS */
 
 struct shutdown_handler {
 	const char *command;
@@ -202,7 +202,7 @@ static void shutdown_handler(struct xenbus_watch *watch,
 		{ "poweroff",	do_poweroff },
 		{ "halt",	do_poweroff },
 		{ "reboot",	do_reboot   },
-#ifdef CONFIG_HIBERNATION
+#ifdef CONFIG_HIBERNATE_CALLBACKS
 		{ "suspend",	do_suspend  },
 #endif
 		{NULL, NULL},