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authorWill Deacon <will.deacon@arm.com>2017-06-23 11:45:57 +0100
committerWill Deacon <will.deacon@arm.com>2017-06-23 17:58:02 +0100
commitc1004803b40596c1aabbbc78a6b1b33e4dfd96c6 (patch)
tree351de9d04fb88b9e2b9121080ca0a67bd859a53d /drivers/iommu/Kconfig
parent58188afeb727e0f73706f1460707bd3ba6ccc221 (diff)
downloadblackbird-op-linux-c1004803b40596c1aabbbc78a6b1b33e4dfd96c6.tar.gz
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iommu/io-pgtable: depend on !GENERIC_ATOMIC64 when using COMPILE_TEST with LPAE
The LPAE/ARMv8 page table format relies on the ability to read and write 64-bit page table entries in an atomic fashion. With the move to a lockless implementation, we also need support for cmpxchg64 to resolve races when installing table entries concurrently. Unfortunately, not all architectures support cmpxchg64, so the code can fail to compiler when building for these architectures using COMPILE_TEST. Rather than disable COMPILE_TEST altogether, instead check that GENERIC_ATOMIC64 is not selected, which is a reasonable indication that the architecture has support for 64-bit cmpxchg. Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'drivers/iommu/Kconfig')
-rw-r--r--drivers/iommu/Kconfig2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 6ee3a25ae731..c88cfa7522b2 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -23,7 +23,7 @@ config IOMMU_IO_PGTABLE
config IOMMU_IO_PGTABLE_LPAE
bool "ARMv7/v8 Long Descriptor Format"
select IOMMU_IO_PGTABLE
- depends on HAS_DMA && (ARM || ARM64 || COMPILE_TEST)
+ depends on HAS_DMA && (ARM || ARM64 || (COMPILE_TEST && !GENERIC_ATOMIC64))
help
Enable support for the ARM long descriptor pagetable format.
This allocator supports 4K/2M/1G, 16K/32M and 64K/512M page
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