linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915/guc: remove redundant GEM_BUG_ON check

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Message-ID: <20180611162552.GY23723@intel.com>
Date:   Mon, 11 Jun 2018 19:25:52 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915/guc: remove redundant GEM_BUG_ON
 check

On Mon, Jun 11, 2018 at 05:00:37PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> The check for level being less than zero is redundant as level
> is an unsigned u32 and hence will never be less than zero.
> Remove this redundant check.
> 
> Detected by CoverityScan, CID#1468363 ("Macro compares unsigned to 0")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  drivers/gpu/drm/i915/intel_guc.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
> index 116f4ccf1bbd..a2f782a4f97d 100644
> --- a/drivers/gpu/drm/i915/intel_guc.c
> +++ b/drivers/gpu/drm/i915/intel_guc.c
> @@ -208,8 +208,6 @@ static u32 get_log_control_flags(void)
>  	u32 level = i915_modparams.guc_log_level;
>  	u32 flags = 0;
>  
> -	GEM_BUG_ON(level < 0);

i915_modparams.guc_log_level is a signed int. So s/u32/int would seem
like a better fix.

> -
>  	if (!GUC_LOG_LEVEL_IS_ENABLED(level))
>  		flags |= GUC_LOG_DEFAULT_DISABLED;
>  
> -- 
> 2.17.0
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel

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