arm64: vdso32: Detect binutils support for dmb ishld

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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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This commit is contained in:

Vincenzo Frascino 2019-10-03 18:48:34 +01:00 • committed by Will Deacon

parent 37a5076098

commit 0df2c90eba

2 changed files with 10 additions and 1 deletions

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2

arch/arm64/include/asm/vdso/compat_barrier.h

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9

arch/arm64/kernel/vdso32/Makefile

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