linux-kernel - [PATCH] drm/amd/display: Respect CONFIG_FRAME

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Message-Id: <20210629112647.1.I7813d8e7298aa1a1c6bee84e6fd44a82ca24805c@changeid>
Date:   Tue, 29 Jun 2021 11:27:18 +1000
From:   Reka Norman <rekanorman@...omium.org>
To:     amd-gfx@...ts.freedesktop.org
Cc:     Reka Norman <rekanorman@...gle.com>,
        Alex Deucher <alexander.deucher@....com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        Christian König <christian.koenig@....com>,
        Daniel Kolesa <daniel@...aforge.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Harry Wentland <harry.wentland@....com>,
        Huang Rui <ray.huang@....com>, Leo Li <sunpeng.li@....com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>, Will Deacon <will@...nel.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/amd/display: Respect CONFIG_FRAME_WARN=0 in dml Makefile

Setting CONFIG_FRAME_WARN=0 should disable 'stack frame larger than'
warnings. This is useful for example in KASAN builds. Make the dml
Makefile respect this config.

Fixes the following build warnings with CONFIG_KASAN=y and
CONFIG_FRAME_WARN=0:

drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn30/display_mode_vba_30.c:3642:6:
warning: stack frame size of 2216 bytes in function
'dml30_ModeSupportAndSystemConfigurationFull' [-Wframe-larger-than=]
drivers/gpu/drm/amd/amdgpu/../display/dc/dml/dcn31/display_mode_vba_31.c:3957:6:
warning: stack frame size of 2568 bytes in function
'dml31_ModeSupportAndSystemConfigurationFull' [-Wframe-larger-than=]

Signed-off-by: Reka Norman <rekanorman@...gle.com>
---

 drivers/gpu/drm/amd/display/dc/dml/Makefile | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dml/Makefile b/drivers/gpu/drm/amd/display/dc/dml/Makefile
index d34024fd798a..45862167e6ce 100644
--- a/drivers/gpu/drm/amd/display/dc/dml/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/dml/Makefile
@@ -50,6 +50,10 @@ dml_ccflags += -msse2
 endif
 endif
 
+ifneq ($(CONFIG_FRAME_WARN),0)
+frame_warn_flag := -Wframe-larger-than=2048
+endif
+
 CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_lib.o := $(dml_ccflags)
 
 ifdef CONFIG_DRM_AMD_DC_DCN
@@ -60,9 +64,9 @@ CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_mode_vba_20v2.o := $(dml_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml/dcn20/display_rq_dlg_calc_20v2.o := $(dml_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_mode_vba_21.o := $(dml_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml/dcn21/display_rq_dlg_calc_21.o := $(dml_ccflags)
-CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_mode_vba_30.o := $(dml_ccflags) -Wframe-larger-than=2048
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_mode_vba_30.o := $(dml_ccflags) $(frame_warn_flag)
 CFLAGS_$(AMDDALPATH)/dc/dml/dcn30/display_rq_dlg_calc_30.o := $(dml_ccflags)
-CFLAGS_$(AMDDALPATH)/dc/dml/dcn31/display_mode_vba_31.o := $(dml_ccflags) -Wframe-larger-than=2048
+CFLAGS_$(AMDDALPATH)/dc/dml/dcn31/display_mode_vba_31.o := $(dml_ccflags) $(frame_warn_flag)
 CFLAGS_$(AMDDALPATH)/dc/dml/dcn31/display_rq_dlg_calc_31.o := $(dml_ccflags)
 CFLAGS_$(AMDDALPATH)/dc/dml/display_mode_lib.o := $(dml_ccflags)
 CFLAGS_REMOVE_$(AMDDALPATH)/dc/dml/display_mode_vba.o := $(dml_rcflags)
-- 
2.32.0.93.g670b81a890-goog