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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 /kernel
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 'kernel')
-rw-r--r--kernel/power/Kconfig6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 4603f08dc47b..049791468d37 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -18,9 +18,13 @@ config SUSPEND_FREEZER
Turning OFF this setting is NOT recommended! If in doubt, say Y.
+config HIBERNATE_CALLBACKS
+ bool
+
config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
depends on SWAP && ARCH_HIBERNATION_POSSIBLE
+ select HIBERNATE_CALLBACKS
select LZO_COMPRESS
select LZO_DECOMPRESS
---help---
@@ -85,7 +89,7 @@ config PM_STD_PARTITION
config PM_SLEEP
def_bool y
- depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE
+ depends on SUSPEND || HIBERNATE_CALLBACKS || XEN_SAVE_RESTORE
config PM_SLEEP_SMP
def_bool y

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