linux-kernel - [PATCH 2/3] drm/amdgpu: Temporarily disable broken Clang builds due to blown stack-frame

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Message-Id: <20221125092517.3074989-3-lee@kernel.org>
Date:   Fri, 25 Nov 2022 09:25:16 +0000
From:   Lee Jones <lee@...nel.org>
To:     lee@...nel.org, arnd@...db.de, akpm@...ux-foundation.org,
        nathan@...nel.org, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, tzimmermann@...e.de, airlied@...il.com,
        daniel@...ll.ch, ndesaulniers@...gle.com, trix@...hat.com,
        harry.wentland@....com, sunpeng.li@....com,
        Rodrigo.Siqueira@....com, alexander.deucher@....com,
        christian.koenig@....com, Xinhui.Pan@....com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 2/3] drm/amdgpu: Temporarily disable broken Clang builds due to blown stack-frame

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.

Suggested-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Lee Jones <lee@...nel.org>
---
 drivers/gpu/drm/Kconfig | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 34f5a092c99e7..1fa7b9760adb8 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -265,6 +265,7 @@ source "drivers/gpu/drm/radeon/Kconfig"
 
 config DRM_AMDGPU
 	tristate "AMD GPU"
+	depends on BROKEN || !CC_IS_CLANG || !(X86_64 || SPARC64 || ARM64)
 	depends on DRM && PCI && MMU
 	select FW_LOADER
 	select DRM_DISPLAY_DP_HELPER
@@ -289,6 +290,12 @@ config DRM_AMDGPU
 	help
 	  Choose this option if you have a recent AMD Radeon graphics card.
 
+	  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.
+
 	  If M is selected, the module will be called amdgpu.
 
 source "drivers/gpu/drm/amd/amdgpu/Kconfig"
-- 
2.38.1.584.g0f3c55d4c2-goog