linux-kernel - [PATCH] nouveau build regression, undefined reference to `acpi_video_get

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Date:	Thu, 09 Sep 2010 23:53:39 -0400
From:	Phil Turmel <philip@...mel.org>
To:	linux-kernel@...r.kernel.org
CC:	Ben Skeggs <bskeggs@...hat.com>, Matthew Garrett <mjg@...hat.com>,
	David Airlie <airlied@...ux.ie>,
	Marcin Kościelnicki <koriakin@...4.net>,
	Francisco Jerez <currojerez@...eup.net>,
	Dave Airlie <airlied@...hat.com>,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH] nouveau build regression, undefined reference to `acpi_video_get_edid'

Hi all,

I've got a build breakage on my laptop:

drivers/built-in.o: In function `nouveau_acpi_edid':
(.text+0x13404e): undefined reference to `acpi_video_get_edid'
make: *** [.tmp_vmlinux1] Error 1

Introduced by:

a6ed76d7ffc62ffa474b41d31b011b6853c5de32 is the first bad commit
commit a6ed76d7ffc62ffa474b41d31b011b6853c5de32
Author: Ben Skeggs <bskeggs@...hat.com>
Date:   Mon Jul 12 15:33:07 2010 +1000

    drm/nouveau: support fetching LVDS EDID from ACPI

    Based on a patch from Matthew Garrett.

    Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
    Acked-by: Matthew Garrett <mjg@...hat.com>

:040000 040000 2fbe9b4d9778329908107e72c11b100c2f5a460b 97dcf06923bb576298746584c45d17d3be9edcf8 M      drivers

It doesn't seem to revert cleanly, but I believe the problem lies in these
two config entries:

CONFIG_ACPI=y
CONFIG_ACPI_VIDEO=m

Having the nouveau ACPI features depend on CONFIG_ACPI_VIDEO instead of
bare CONFIG_ACPI builds, boots, and works for me.

Signed-off-by: Philip J. Turmel <philip@...mel.org>
---

Presumably, this could also be solved by adding
"select ACPI_VIDEO if ACPI" to the nouveau Kconfig.
I'd be happy to try that, if this approach is flawed.

diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index e9b06e4..4e295b5 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -28,6 +28,6 @@ nouveau-y := nouveau_drv.o nouveau_state.o nouveau_channel.o nouveau_mem.o \
 nouveau-$(CONFIG_DRM_NOUVEAU_DEBUG) += nouveau_debugfs.o
 nouveau-$(CONFIG_COMPAT) += nouveau_ioc32.o
 nouveau-$(CONFIG_DRM_NOUVEAU_BACKLIGHT) += nouveau_backlight.o
-nouveau-$(CONFIG_ACPI) += nouveau_acpi.o
+nouveau-$(CONFIG_ACPI_VIDEO) += nouveau_acpi.o
 
 obj-$(CONFIG_DRM_NOUVEAU)+= nouveau.o
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index b1be617..bd995b4 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -842,7 +842,7 @@ extern int  nouveau_dma_wait(struct nouveau_channel *, int slots, int size);
 
 /* nouveau_acpi.c */
 #define ROM_BIOS_PAGE 4096
-#if defined(CONFIG_ACPI)
+#if defined(CONFIG_ACPI_VIDEO)
 void nouveau_register_dsm_handler(void);
 void nouveau_unregister_dsm_handler(void);
 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len);

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