[PATCH] ACPI suspend: Fix CONFIG_ACPI_SLEEP dependence and some compilation warnings (was: Re: [announce] new tree: "fix all build warnings, on all configs")

Rafael J. Wysocki
2008-10-22T12:19:29Z

On Wednesday, 22 of October 2008, Len Brown wrote:
>
> > > drivers/acpi/sleep/main.c:67: warning: ‘acpi_pm_disable_gpes’ defined but not used
>
> > >
> > > Shows that this code has an identity crisis due to a maze of #ifdefs, in
> > > the PM_SLEEP && !SUSPEND && !HIBERNATION case for example.
> >
> > This case is invalid, because PM_SLEEP == SUSPEND || HIBERNATION !
>
> I though so too, but 2.6.27 appears to have added XEN to the mix:
>
> config PM_SLEEP
> bool
> depends on SUSPEND || HIBERNATION || XEN_SAVE_RESTORE

Yeah, which breaks things. :-(

The patch below should fix it and BTW I think ACPI_SLEEP should not depend
on XEN_SAVE_RESTORE anyway, so this is a bug fix really (please consider as
.28 material, probably -stable too).

Thanks,
Rafael

---
From: Rafael J. Wysocki <rjw@sisk.pl>

ACPI suspend: Fix CONFIG_ACPI_SLEEP dependence and some compilation warnings

Initially CONFIG_PM_SLEEP was defined as
CONFIG_SUSPEND || CONFIG_HIBERNATION and some ACPI code, most
importantly the code in drivers/acpi/main.c, was written with this
assumption. Currently, however, CONFIG_PM_SLEEP is also set when
CONFIG_XEN_SAVE_RESTORE is set.

This causes some compilation warnings to appear in
drivers/acpi/main.c if both CONFIG_SUSPEND and CONFIG_HIBERNATION
are unset and CONFIG_PM_SLEEP is set (this was impossible before).
To fix this problem, redefine CONFIG_ACPI_SLEEP do depend directly
on CONFIG_SUSPEND || CONFIG_HIBERNATION, as originally intended, and
use it instead of CONFIG_PM_SLEEP in drivers/acpi/main.c, wherever
appropriate.

Additionally, move the acpi_target_sleep_state definition from under
the #ifdef to prevent compilation from failing in some cases.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
drivers/acpi/Kconfig | 2 +-
drivers/acpi/sleep/main.c | 7 +++----
2 files changed, 4 insertions(+), 5 deletions(-)

Index: linux-2.6/drivers/acpi/Kconfig
===================================================================
--- linux-2.6.orig/drivers/acpi/Kconfig
+++ linux-2.6/drivers/acpi/Kconfig
@@ -42,7 +42,7 @@ if ACPI

config ACPI_SLEEP
bool
- depends on PM_SLEEP
+ depends on SUSPEND || HIBERNATION
default y

config ACPI_PROCFS
Index: linux-2.6/drivers/acpi/sleep/main.c
===================================================================
--- linux-2.6.orig/drivers/acpi/sleep/main.c
+++ linux-2.6/drivers/acpi/sleep/main.c
@@ -23,6 +23,7 @@
#include "sleep.h"

u8 sleep_states[ACPI_S_STATE_COUNT];
+static u32 acpi_target_sleep_state = ACPI_STATE_S0;

static int acpi_sleep_prepare(u32 acpi_state)
{
@@ -45,9 +46,7 @@ static int acpi_sleep_prepare(u32 acpi_s
return 0;
}

-#ifdef CONFIG_PM_SLEEP
-static u32 acpi_target_sleep_state = ACPI_STATE_S0;
-
+#ifdef CONFIG_ACPI_SLEEP
/*
* ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
* user to request that behavior by using the 'acpi_old_suspend_ordering'
@@ -132,7 +131,7 @@ static void acpi_pm_end(void)
*/
acpi_target_sleep_state = ACPI_STATE_S0;
}
-#endif /* CONFIG_PM_SLEEP */
+#endif /* CONFIG_ACPI_SLEEP */

#ifdef CONFIG_SUSPEND
extern void do_suspend_lowlevel(void);