linux-kernel - Re: next-20140312 - build error in drivers/acpi/sleep.c

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Date:	Thu, 13 Mar 2014 22:23:51 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: next-20140312 - build error in drivers/acpi/sleep.c

On Thursday, March 13, 2014 02:48:31 PM Valdis Kletnieks wrote:
> Seen in the most recent linux-next with a CONFIG_SUSPEND=n .config:
> 
>   CC      drivers/acpi/sleep.o
> drivers/acpi/sleep.c: In function 'acpi_sleep_init':
> drivers/acpi/sleep.c:808:2: error: implicit declaration of function 'acpi_sleep_state_supported' [-Werror=implicit-function-declaration]
>   if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
>   ^
> cc1: some warnings being treated as errors
> make[2]: *** [drivers/acpi/sleep.o] Error 1
> make[1]: *** [drivers/acpi] Error 2
> make: *** [drivers] Error 2
> 
> Function is defined inside a #ifdef CONFIG_SUSPEND, but used outside of
> one in acpi_sleep_init().

This isn't caught by the build test robot.  Care to submit that .config to
Fengguang so that you don't have to report such failures again?

> git blame points at commit eaa54ccbc:
> 
> commit eaa54ccbcf81de987e6978ad457cc9e425b7a8db
> Author: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Date:   Tue Mar 11 14:08:58 2014 +0100
> 
>     ACPI / sleep: Add extra checks for HW Reduced ACPI mode sleep states
> 
>     If the HW Reduced ACPI mode bit is set in the FADT, ACPICA uses
>     the optional sleep control and sleep status registers for making
>     the system enter sleep states (including S5), so it is not possible
>     to use system sleep states or power it off using ACPI if the HW
>     Reduced ACPI mode bit is set and those registers are not available.
> 
>     For this reason, add a new function, acpi_sleep_state_supported(),
>     checking if the HW Reduced ACPI mode bit is set and whether or not
>     system sleep states are usable in that case in addition to checking
>     the return value of acpi_get_sleep_type_data() and make the ACPI
>     sleep setup routines use that function to check the availability of
>     system sleep states.
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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