arm64: lse: fix LSE atomics with LLVM's integrated assembler

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Unlike gcc, clang considers each inline assembly block to be independent
and therefore, when using the integrated assembler for inline assembly,
any preambles that enable features must be repeated in each block.

This change defines __LSE_PREAMBLE and adds it to each inline assembly
block that has LSE instructions, which allows them to be compiled also
with clang's assembler.

Link: https://github.com/ClangBuiltLinux/linux/issues/671
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Andrew Murray <andrew.murray@arm.com>
Tested-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Will Deacon <will@kernel.org>

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This commit is contained in:

Sami Tolvanen 2019-10-31 12:57:05 -07:00 • committed by Will Deacon

parent 46cf053efe

commit e0d5896bd3

2 changed files with 22 additions and 3 deletions

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19

arch/arm64/include/asm/atomic_lse.h

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6

arch/arm64/include/asm/lse.h

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