linux-kernel - [PATCH -next] drm/panfrost: depend on !GENERIC_ATOMIC64 when using COMPILE

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Date:   Wed, 17 Apr 2019 16:29:28 +0100
From:   Steven Price <steven.price@....com>
To:     Rob Herring <robh@...nel.org>
Cc:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Steven Price <steven.price@....com>,
        kbuild test robot <lkp@...el.com>
Subject: [PATCH -next] drm/panfrost: depend on !GENERIC_ATOMIC64 when using COMPILE_TEST

Since panfrost has a 'select' on IOMMU_IO_PGTABLE_LPAE we must depend on
the same set of flags. Otherwise IOMMU_IO_PGTABLE_LPAE will be forced on
even though it cannot build (no support for cmpxchg64).

This fixes the following warning from kconfig:

WARNING: unmet direct dependencies detected for IOMMU_IO_PGTABLE_LPAE
  Depends on [n]: IOMMU_SUPPORT [=y] && (ARM || ARM64 || COMPILE_TEST [=y] && !GENERIC_ATOMIC64 [=y])
  Selected by [y]:
  - DRM_PANFROST [=y] && HAS_IOMEM [=y] && DRM [=y] && (ARM || ARM64 || COMPILE_TEST [=y]) && MMU [=y]

Reported-by: kbuild test robot <lkp@...el.com>
Signed-off-by: Steven Price <steven.price@....com>
---
 drivers/gpu/drm/panfrost/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/Kconfig b/drivers/gpu/drm/panfrost/Kconfig
index 7f5e572daa2d..591611dc4e34 100644
--- a/drivers/gpu/drm/panfrost/Kconfig
+++ b/drivers/gpu/drm/panfrost/Kconfig
@@ -3,7 +3,7 @@
 config DRM_PANFROST
 	tristate "Panfrost (DRM support for ARM Mali Midgard/Bifrost GPUs)"
 	depends on DRM
-	depends on ARM || ARM64 || COMPILE_TEST
+	depends on ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64)
 	depends on MMU
 	select DRM_SCHED
 	select IOMMU_SUPPORT
-- 
2.20.1