linux-kernel - Re: [PATCH] drm/radeon: make array encoded

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Date:   Wed, 15 Sep 2021 11:18:10 -0400
From:   Alex Deucher <alexdeucher@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        xinhui pan <Xinhui.Pan@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        amd-gfx list <amd-gfx@...ts.freedesktop.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>, kernel-janitors@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: make array encoded_lanes static

On Wed, Sep 15, 2021 at 7:36 AM Colin King <colin.king@...onical.com> wrote:
>
> From: Colin Ian King <colin.king@...onical.com>
>
> Don't populate the read-only array encoded_lanes on the stack but instead it
> static. Also makes the object code smaller by 97 bytes:
>
> Before:
>    text    data    bss     dec    hex filename
>   38899    8064      0   46963   b773 ./drivers/gpu/drm/radeon/r600_dpm.o
>
> After:
>    text    data    bss     dec    hex filename
>   38738    8128      0   46866   b712 ./drivers/gpu/drm/radeon/r600_dpm.o
>
> (gcc version 11.2.0)
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Applied.  Thanks!

Alex

> ---
>  drivers/gpu/drm/radeon/r600_dpm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/r600_dpm.c b/drivers/gpu/drm/radeon/r600_dpm.c
> index fd4226b99862..9d2bcb9551e6 100644
> --- a/drivers/gpu/drm/radeon/r600_dpm.c
> +++ b/drivers/gpu/drm/radeon/r600_dpm.c
> @@ -1361,7 +1361,9 @@ u16 r600_get_pcie_lane_support(struct radeon_device *rdev,
>
>  u8 r600_encode_pci_lane_width(u32 lanes)
>  {
> -       u8 encoded_lanes[] = { 0, 1, 2, 0, 3, 0, 0, 0, 4, 0, 0, 0, 5, 0, 0, 0, 6 };
> +       static const u8 encoded_lanes[] = {
> +               0, 1, 2, 0, 3, 0, 0, 0, 4, 0, 0, 0, 5, 0, 0, 0, 6
> +       };
>
>         if (lanes > 16)
>                 return 0;
> --
> 2.32.0
>