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authorVincenzo Frascino <vincenzo.frascino@arm.com>2019-10-03 18:48:34 +0100
committerWill Deacon <will@kernel.org>2019-10-07 11:07:16 +0100
commit0df2c90eba60791148cee1823c0bf5fc66e3465c (patch)
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parent37a5076098c17f40913c772b017ff8e48e449656 (diff)
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arm64: vdso32: Detect binutils support for dmb ishld
Older versions of binutils (prior to 2.24) do not support the "ISHLD" option for memory barrier instructions, which leads to a build failure when assembling the vdso32 library. Add a compilation time mechanism that detects if binutils supports those instructions and configure the kernel accordingly. Cc: Will Deacon <will@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Reported-by: Will Deacon <will@kernel.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
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