linux-kernel - [PATCH 13/40] drm/amd/display/dc/calcs/dce_calcs: Move some large variables from the stack to the heap

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Message-Id: <20210111191926.3688443-14-lee.jones@linaro.org>
Date:   Mon, 11 Jan 2021 19:18:59 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     lee.jones@...aro.org
Cc:     linux-kernel@...r.kernel.org,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Colin Ian King <colin.king@...onical.com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH 13/40] drm/amd/display/dc/calcs/dce_calcs: Move some large variables from the stack to the heap

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dce_calcs.c: In function ‘calculate_bandwidth’:
 drivers/gpu/drm/amd/amdgpu/../display/dc/calcs/dce_calcs.c:2016:1: warning: the frame size of 1216 bytes is larger than 1024 bytes [-Wframe-larger-than=]

Cc: Harry Wentland <harry.wentland@....com>
Cc: Leo Li <sunpeng.li@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: "Christian König" <christian.koenig@....com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: Colin Ian King <colin.king@...onical.com>
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 .../gpu/drm/amd/display/dc/calcs/dce_calcs.c  | 21 +++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c b/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
index 158d927c03e55..a0c69fae40ced 100644
--- a/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
+++ b/drivers/gpu/drm/amd/display/dc/calcs/dce_calcs.c
@@ -98,16 +98,16 @@ static void calculate_bandwidth(
 	int32_t num_cursor_lines;
 
 	int32_t i, j, k;
-	struct bw_fixed yclk[3];
-	struct bw_fixed sclk[8];
+	struct bw_fixed *yclk;
+	struct bw_fixed *sclk;
 	bool d0_underlay_enable;
 	bool d1_underlay_enable;
 	bool fbc_enabled;
 	bool lpt_enabled;
 	enum bw_defines sclk_message;
 	enum bw_defines yclk_message;
-	enum bw_defines tiling_mode[maximum_number_of_surfaces];
-	enum bw_defines surface_type[maximum_number_of_surfaces];
+	enum bw_defines *tiling_mode;
+	enum bw_defines *surface_type;
 	enum bw_defines voltage;
 	enum bw_defines pipe_check;
 	enum bw_defines hsr_check;
@@ -122,6 +122,14 @@ static void calculate_bandwidth(
 	int32_t number_of_displays_enabled_with_margin = 0;
 	int32_t number_of_aligned_displays_with_no_margin = 0;
 
+	yclk = kzalloc(sizeof(*yclk) * 3, GFP_KERNEL);
+	sclk = kzalloc(sizeof(*sclk) * 8, GFP_KERNEL);
+
+	tiling_mode = kzalloc(sizeof(*tiling_mode) *
+			      maximum_number_of_surfaces, GFP_KERNEL);
+	surface_type = kzalloc(sizeof(*surface_type) *
+			       maximum_number_of_surfaces, GFP_KERNEL);
+
 	yclk[low] = vbios->low_yclk;
 	yclk[mid] = vbios->mid_yclk;
 	yclk[high] = vbios->high_yclk;
@@ -2013,6 +2021,11 @@ static void calculate_bandwidth(
 			}
 		}
 	}
+
+	kfree(tiling_mode);
+	kfree(surface_type);
+	kfree(yclk);
+	kfree(sclk);
 }
 
 /*******************************************************************************
-- 
2.25.1