Re: [PATCH] drm/i915: Don't request a bug report for unsafe module parameters

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Quoting Chris Wilson (2018-05-06 21:31:47)
> Unsafe module parameters are just that, unsafe. If the user is foolish
> enough to try them and the kernel breaks, they get to keep both pieces.
> Don't ask them to file a bug report if they broke it themselves.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=106423
> Fixes: d15d7538c6d2 ("drm/i915: Tune down init error message due to failure injection")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Imre Deak <imre.deak@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_drv.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> index 9b782045ae17..9c449b8d8eab 100644
> --- a/drivers/gpu/drm/i915/i915_drv.c
> +++ b/drivers/gpu/drm/i915/i915_drv.c
> @@ -101,7 +101,13 @@ __i915_printk(struct drm_i915_private *dev_priv, const char *level,
>                    __builtin_return_address(0), &vaf);
>  
>         if (is_error && !shown_bug_once) {
> -               dev_notice(kdev, "%s", FDO_BUG_MSG);
> +               /*
> +                * Ask the user to file a bug report for the error, except
> +                * if they may have caused the bug by fiddling with unsafe
> +                * module parameters.
> +                */
> +               if (!test_taint(TAINT_USER))
> +                       dev_notice(kdev, "%s", FDO_BUG_MSG);

We cold even have FDO_TAINT_MSG.

Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>

Regards, Joonas

>                 shown_bug_once = true;
>         }
>  
> -- 
> 2.17.0
> 
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