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

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Message-ID: <87hbhslatm.fsf@riseup.net>
Date:	Tue, 14 Sep 2010 15:21:57 +0200
From:	Francisco Jerez <currojerez@...eup.net>
To:	Phil Turmel <philip@...mel.org>
Cc:	linux-kernel@...r.kernel.org, Ben Skeggs <bskeggs@...hat.com>,
	Matthew Garrett <mjg@...hat.com>,
	David Airlie <airlied@...ux.ie>,
	Marcin Kościelnicki <koriakin@...4.net>,
	Dave Airlie <airlied@...hat.com>,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] nouveau build regression, undefined reference to `acpi_video_get_edid'

Phil Turmel <philip@...mel.org> writes:

> 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.
>
nouveau_acpi_edid() is the only function that depends on ACPI_VIDEO,
ifdef'ing out the rest of the ACPI stuff in that case doesn't make much
sense to 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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