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ANDROID: arm64: lse: fix LSE atomics with LTO

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LLVM's integrated assembler is always used for inline assembly with
CONFIG_LTO_CLANG. Unlike gcc, LLVM considers each inline assembly
block to be independent and therefore, any preambles that enable
features must be included in each block.

This change adds the necessary preamble to ARM64_LSE_ATOMIC_INSN to
allow CONFIG_ARM64_LSE_ATOMICS to be enabled with LTO.

Bug: 117299373
Bug: 133186739
Change-Id: Icc06361dc2a2dba0f5f967d7f540cac2753b3e9c
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen
2019-02-06 12:51:14 -08:00
committed by Alistair Strachan
parent 864f2bc0e4
commit 3bd6dd6a79
1 changed files with 6 additions and 1 deletions
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7
arch/arm64/include/asm/lse.h
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@@ -20,7 +20,12 @@
#else /* __ASSEMBLER__ */
#ifdef CONFIG_LTO_CLANG
#define __LSE_PREAMBLE ".arch armv8-a+lse\n"
#else
__asm__(".arch_extension lse");
#define __LSE_PREAMBLE
#endif
/* Move the ll/sc atomics out-of-line */
#define __LL_SC_INLINE notrace
@@ -33,7 +38,7 @@ __asm__(".arch_extension lse");
/* In-line patching at runtime */
#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \
ALTERNATIVE(llsc, lse, ARM64_HAS_LSE_ATOMICS)
ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS)
#endif /* __ASSEMBLER__ */
#else /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */