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arm64: barrier: Restore spec_bar() macro

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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>
This commit is contained in:
Mark Rutland 2024-05-08 09:13:57 +01:00 committed by Will Deacon
parent fec50db703
commit ebfc726eae
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/include/asm/barrier.h
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@ -40,6 +40,10 @@
*/
#define dgh() asm volatile("hint #6" : : : "memory")
#define spec_bar() asm volatile(ALTERNATIVE("dsb nsh\nisb\n", \
SB_BARRIER_INSN"nop\n", \
ARM64_HAS_SB))
#ifdef CONFIG_ARM64_PSEUDO_NMI
#define pmr_sync() \
do { \