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

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Message-Id: <20220223120923.239867-1-colin.i.king@gmail.com>
Date:   Wed, 23 Feb 2022 12:09:23 +0000
From:   Colin Ian King <colin.i.king@...il.com>
To:     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>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][V2] drm/i915: make a handful of read-only arrays static const

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>
---

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