[cc += Rafael J. Wysocki, linux-acpi]

Hi Stephen,

On Wed, Feb 10, 2016 at 12:24:51PM +1100, Stephen Rothwell wrote:

Hi all,

After merging the drm-misc tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

In file included from drivers/gpu/drm/nouveau/nouveau_drm.c:25:0:
include/linux/apple-gmux.h: In function 'apple_gmux_present':
include/linux/apple-gmux.h:36:42: error: implicit declaration of function 'acpi_dev_present' [-Werror=implicit-function-declaration]
  return IS_ENABLED(CONFIG_APPLE_GMUX) && acpi_dev_present(GMUX_ACPI_HID);
                                          ^

Caused by commit

  2413306c2566 ("apple-gmux: Add helper for presence detect")

I have used the drm-misc tree from next-20160209 for today.

Ugh, apologies, I didn't have a non-ACPI platform available to test
this on.

Solution is to either add to include/linux/acpi.h

static inline bool acpi_dev_present(const char *hid)
{
	return false;
}

somewhere below

#else	/* !CONFIG_ACPI */

or alternatively to add to include/linux/apple-gmux.h

IS_ENABLED(CONFIG_ACPI)

in apple_gmux_present().

I'll check the other users of acpi_dev_present() to see which of
these two solutions is more appropriate and will post a fix shortly.

Thanks a lot for reporting this.

Lukas
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