From bcacf9574e2f063eb3a85296153f6c957a3911ab Mon Sep 17 00:00:00 2001

From: Lee Jones <lee@kernel.org>

Date: Fri, 25 Nov 2022 12:07:49 +0000

Subject: drm/amdgpu: temporarily disable broken Clang builds due to blown

 stack-frame

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Git-commit: 6f6cb1714365a07dbc66851879538df9f6969288

Patch-mainline: v6.1-rc8

References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849

Patch series "Fix a bunch of allmodconfig errors", v2.

Since b339ec9c229aa ("kbuild: Only default to -Werror if COMPILE_TEST")

WERROR now defaults to COMPILE_TEST meaning that it's enabled for

allmodconfig builds.  This leads to some interesting build failures when

using Clang, each resolved in this set.

With this set applied, I am able to obtain a successful allmodconfig Arm

build.

This patch (of 2):

calculate_bandwidth() is presently broken on all !(X86_64 || SPARC64 ||

ARM64) architectures built with Clang (all released versions), whereby the

stack frame gets blown up to well over 5k.  This would cause an immediate

kernel panic on most architectures.  We'll revert this when the following

bug report has been resolved:

https://github.com/llvm/llvm-project/issues/41896.

Link: https://lkml.kernel.org/r/20221125120750.3537134-1-lee@kernel.org

Link: https://lkml.kernel.org/r/20221125120750.3537134-2-lee@kernel.org

Signed-off-by: Lee Jones <lee@kernel.org>

Suggested-by: Arnd Bergmann <arnd@arndb.de>

Acked-by: Arnd Bergmann <arnd@arndb.de>

Cc: Alex Deucher <alexander.deucher@amd.com>

Cc: "Christian König" <christian.koenig@amd.com>

Cc: Daniel Vetter <daniel@ffwll.ch>

Cc: David Airlie <airlied@gmail.com>

Cc: Harry Wentland <harry.wentland@amd.com>

Cc: Lee Jones <lee@kernel.org>

Cc: Leo Li <sunpeng.li@amd.com>

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

Cc: Maxime Ripard <mripard@kernel.org>

Cc: Nathan Chancellor <nathan@kernel.org>

Cc: Nick Desaulniers <ndesaulniers@google.com>

Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>

Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>

Cc: Thomas Zimmermann <tzimmermann@suse.de>

Cc: Tom Rix <trix@redhat.com>

Cc: <stable@vger.kernel.org>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Acked-by: Patrik Jakobsson <pjakobsson@suse.de>

---

 drivers/gpu/drm/amd/display/Kconfig | 7 +++++++

 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig

index 6925e0280dbe..f4f3d2665a6b 100644

--- a/drivers/gpu/drm/amd/display/Kconfig

+++ b/drivers/gpu/drm/amd/display/Kconfig

@@ -5,6 +5,7 @@ menu "Display Engine Configuration"

 config DRM_AMD_DC

 	bool "AMD DC - Enable new display engine"

 	default y

+	depends on BROKEN || !CC_IS_CLANG || X86_64 || SPARC64 || ARM64

 	select SND_HDA_COMPONENT if SND_HDA_CORE

 	select DRM_AMD_DC_DCN if (X86 || PPC_LONG_DOUBLE_128)

 	help

@@ -12,6 +13,12 @@ config DRM_AMD_DC

 	  support for AMDGPU. This adds required support for Vega and

 	  Raven ASICs.

+	  calculate_bandwidth() is presently broken on all !(X86_64 || SPARC64 || ARM64)

+	  architectures built with Clang (all released versions), whereby the stack

+	  frame gets blown up to well over 5k.  This would cause an immediate kernel

+	  panic on most architectures.  We'll revert this when the following bug report

+	  has been resolved: https://github.com/llvm/llvm-project/issues/41896.

+

 config DRM_AMD_DC_DCN

 	def_bool n

 	help

-- 

2.38.1