linux-kernel - Re: [PATCH][V2] drm/i915: make a handful of read-only arrays static const

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <Yh5UhnaGMFFM1Nxs@intel.com>
Date:   Tue, 1 Mar 2022 19:14:46 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Colin Ian King <colin.i.king@...il.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][V2] drm/i915: make a handful of read-only arrays static
 const

On Wed, Feb 23, 2022 at 12:09:23PM +0000, Colin Ian King wrote:
> Don't populate the read-only arrays on the stack but instead make
> them static const and signed 8 bit ints. Also makes the object code a
> little smaller.  Reformat the statements to clear up checkpatch warning.
> 
> Signed-off-by: Colin Ian King <colin.i.king@...il.com>

Thanks. Pushed to drm-intel-next.

> ---
> 
> V2: Make arrays signed 8 bit integers as requested by Ville Syrjälä
> 
> ---
>  drivers/gpu/drm/i915/display/intel_vdsc.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
> index 3faea903b9ae..d49f66237ec3 100644
> --- a/drivers/gpu/drm/i915/display/intel_vdsc.c
> +++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
> @@ -378,10 +378,18 @@ calculate_rc_params(struct rc_parameters *rc,
>  {
>  	int bpc = vdsc_cfg->bits_per_component;
>  	int bpp = vdsc_cfg->bits_per_pixel >> 4;
> -	int ofs_und6[] = { 0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12 };
> -	int ofs_und8[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
> -	int ofs_und12[] = { 2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12 };
> -	int ofs_und15[] = { 10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12 };
> +	static const s8 ofs_und6[] = {
> +		0, -2, -2, -4, -6, -6, -8, -8, -8, -10, -10, -12, -12, -12, -12
> +	};
> +	static const s8 ofs_und8[] = {
> +		2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
> +	};
> +	static const s8 ofs_und12[] = {
> +		2, 0, 0, -2, -4, -6, -8, -8, -8, -10, -10, -10, -12, -12, -12
> +	};
> +	static const s8 ofs_und15[] = {
> +		10, 8, 6, 4, 2, 0, -2, -4, -6, -8, -10, -10, -12, -12, -12
> +	};
>  	int qp_bpc_modifier = (bpc - 8) * 2;
>  	u32 res, buf_i, bpp_i;
>  
> -- 
> 2.34.1

-- 
Ville Syrjälä
Intel