From: Harry Wentland <harry.wentland@amd.com>
Date: Mon, 2 Oct 2017 15:27:26 -0400
Subject: drm/amd/display: Ignore wrong tautological warning
Git-commit: 410d0b39e2247778db5ead9d40330837fecb7a43
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Some of our HW calcs functions compares a var against
itself to check for NaN. Gcc isn't fond of it and wrongfully
warns about a tautological comparison. Disable this check
for dcn_calcs_math.c.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/calcs/Makefile |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/dc/calcs/Makefile
+++ b/drivers/gpu/drm/amd/display/dc/calcs/Makefile
@@ -5,7 +5,7 @@
 
 CFLAGS_dcn_calcs.o := -mhard-float -msse -mpreferred-stack-boundary=4
 CFLAGS_dcn_calc_auto.o := -mhard-float -msse -mpreferred-stack-boundary=4
-CFLAGS_dcn_calc_math.o := -mhard-float -msse -mpreferred-stack-boundary=4
+CFLAGS_dcn_calc_math.o := -mhard-float -msse -mpreferred-stack-boundary=4 -Wno-tautological-compare
 
 BW_CALCS = dce_calcs.o bw_fixed.o custom_float.o