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arm64: barrier: Restore spec_bar() macro
Upcoming errata workarounds will need to use SB from C code. Restore the
spec_bar() macro so that we can use SB.
This is effectively a revert of commit:
4f30ba1cce
("arm64: barrier: Remove spec_bar() macro")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20240508081400.235362-2-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
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1 changed files with 4 additions and 0 deletions
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@ -40,6 +40,10 @@
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*/
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#define dgh() asm volatile("hint #6" : : : "memory")
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#define spec_bar() asm volatile(ALTERNATIVE("dsb nsh\nisb\n", \
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SB_BARRIER_INSN"nop\n", \
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ARM64_HAS_SB))
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#ifdef CONFIG_ARM64_PSEUDO_NMI
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#define pmr_sync() \
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do { \
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