On Tuesday, 11 of December 2007, Johannes Berg wrote:
> This patch makes the freezer optional for suspend to allow the
> system to work (or not work) like the original PMU suspend.
>
> Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx>
Looks good.
I'm going to push this patch upstream, for 2.6.25.
Thanks,
Rafael
> ---
> In a quick test, playing sound across suspend failed to work,
> it usually works when the freezer is enabled (unless you use
> gstreamer.)
>
> arch/powerpc/Kconfig | 4 ++++
> kernel/power/Kconfig | 11 +++++++++++
> kernel/power/main.c | 6 +++---
> kernel/power/power.h | 22 ++++++++++++++++++++++
> 4 files changed, 40 insertions(+), 3 deletions(-)
>
> --- everything.orig/kernel/power/main.c 2007-12-11 15:13:05.726937988 +0100
> +++ everything/kernel/power/main.c 2007-12-11 15:16:21.816910590 +0100
> @@ -79,7 +79,7 @@ static int suspend_prepare(void)
>
> pm_prepare_console();
>
> - if (freeze_processes()) {
> + if (suspend_freeze_processes()) {
> error = -EAGAIN;
> goto Thaw;
> }
> @@ -97,7 +97,7 @@ static int suspend_prepare(void)
> return 0;
>
> Thaw:
> - thaw_processes();
> + suspend_thaw_processes();
> pm_restore_console();
> Finish:
> pm_notifier_call_chain(PM_POST_SUSPEND);
> @@ -191,7 +191,7 @@ int suspend_devices_and_enter(suspend_st
> */
> static void suspend_finish(void)
> {
> - thaw_processes();
> + suspend_thaw_processes();
> pm_restore_console();
> pm_notifier_call_chain(PM_POST_SUSPEND);
> }
> --- everything.orig/kernel/power/Kconfig 2007-12-11 15:13:05.856915473 +0100
> +++ everything/kernel/power/Kconfig 2007-12-11 15:13:40.306913303 +0100
> @@ -97,6 +97,17 @@ config SUSPEND
> powered and thus its contents are preserved, such as the
> suspend-to-RAM state (i.e. the ACPI S3 state).
>
> +config SUSPEND_FREEZER
> + bool "Enable freezer for suspend to RAM/standby" \
> + if ARCH_WANTS_FREEZER_CONTROL || BROKEN
> + depends on SUSPEND
> + default y
> + help
> + This allows you to turn off the freezer for suspend. If this is
> + done, no tasks are frozen for suspend to RAM/standby.
> +
> + Turning OFF this setting is NOT recommended! If in doubt, say Y.
> +
> config HIBERNATION_UP_POSSIBLE
> bool
> depends on X86 || PPC64_SWSUSP || PPC32
> --- everything.orig/arch/powerpc/Kconfig 2007-12-11 15:13:05.926915907 +0100
> +++ everything/arch/powerpc/Kconfig 2007-12-11 15:13:40.316913954 +0100
> @@ -365,6 +365,10 @@ config CMDLINE
> most cases you will need to specify the root device here.
>
> if !44x || BROKEN
> +config ARCH_WANTS_FREEZER_CONTROL
> + def_bool y
> + depends on ADB_PMU
> +
> source kernel/power/Kconfig
> endif
>
> --- everything.orig/kernel/power/power.h 2007-12-11 15:14:02.066914117 +0100
> +++ everything/kernel/power/power.h 2007-12-11 15:17:10.136910319 +0100
> @@ -1,5 +1,6 @@
> #include <linux/suspend.h>
> #include <linux/utsname.h>
> +#include <linux/freezer.h>
>
> struct swsusp_info {
> struct new_utsname uts;
> @@ -211,3 +212,24 @@ static inline int pm_notifier_call_chain
> return (blocking_notifier_call_chain(&pm_chain_head, val, NULL)
> == NOTIFY_BAD) ? -EINVAL : 0;
> }
> +
> +#ifdef CONFIG_SUSPEND_FREEZER
> +static inline int suspend_freeze_processes(void)
> +{
> + return freeze_processes();
> +}
> +
> +static inline void suspend_thaw_processes(void)
> +{
> + thaw_processes();
> +}
> +#else
> +static inline int suspend_freeze_processes(void)
> +{
> + return 0;
> +}
> +
> +static inline void suspend_thaw_processes(void)
> +{
> +}
> +#endif
>
>
>
>
--
"Premature optimization is the root of all evil." - Donald Knuth
_______________________________________________
linux-pm mailing list
linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/linux-pm
