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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2011-04-11 22:54:42 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2011-04-11 22:54:42 +0200 |
| commit | 1f112cee07b314e244ee9e71d9c1e6950dc13327 (patch) | |
| tree | e089e646c78701e37b4ebe00db36082e47cab2d5 /drivers/pci | |
| parent | b42282e5a05018ecdc0d63a4ad530b0999785912 (diff) | |
| download | linux-1f112cee07b314e244ee9e71d9c1e6950dc13327.tar.bz2 | |
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/pci')
| -rw-r--r-- | drivers/pci/pci-driver.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index d86ea8b01137..135df164a4c1 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 |