linux-kernel - Re: [PATCH] vgaarb: Stub vga_set_legacy_decoding()

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Message-ID: <CAPM=9tzmiZYyrfSuzRn7M+==7wMsreOdn2vsV0dKsZdibjFWaA@mail.gmail.com>
Date:	Thu, 5 Mar 2015 09:43:04 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	Dave Airlie <airlied@...ux.ie>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vgaarb: Stub vga_set_legacy_decoding()

On 25 February 2015 at 02:16, Alex Williamson
<alex.williamson@...hat.com> wrote:
> vga_set_legacy_decoding() is defined in drivers/gpu/vga/vgaarb.c,
> which is only compiled with CONFIG_VGA_ARB.  A caller would
> therefore get an undefined symbol if the VGA arbiter is not
> enabled.

Acked-by: Dave Airlie <airlied@...hat.com>

> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> ---
>
> I'd like to use this function from vfio-pci to opt-out VGA devices
> from arbitration if vfio-pci VGA support is disabled.  This helps to
> keep DRI2 enabled on the host if additional GPUs are installed for
> VMs and used without VGA support.  I can pull this change in through
> my tree if someone wants to provide just an ack.  Thanks!
>
>  include/linux/vgaarb.h |    5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
> index c37bd4d..8c3b412 100644
> --- a/include/linux/vgaarb.h
> +++ b/include/linux/vgaarb.h
> @@ -65,8 +65,13 @@ struct pci_dev;
>   *     out of the arbitration process (and can be safe to take
>   *     interrupts at any time.
>   */
> +#if defined(CONFIG_VGA_ARB)
>  extern void vga_set_legacy_decoding(struct pci_dev *pdev,
>                                     unsigned int decodes);
> +#else
> +static inline void vga_set_legacy_decoding(struct pci_dev *pdev,
> +                                          unsigned int decodes) { };
> +#endif
>
>  /**
>   *     vga_get         - acquire & locks VGA resources
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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