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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/amba | |
| parent | b42282e5a05018ecdc0d63a4ad530b0999785912 (diff) | |
| download | op-kernel-dev-1f112cee07b314e244ee9e71d9c1e6950dc13327.zip op-kernel-dev-1f112cee07b314e244ee9e71d9c1e6950dc13327.tar.gz | |
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/amba')
| -rw-r--r-- | drivers/amba/bus.c | 6 |
1 files changed, 3 insertions, 3 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 |
