arm64: barrier: Restore spec_bar() macro

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[ Upstream commit ebfc726eae ]

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>
[ Mark: trivial backport ]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Mark Rutland 2024-08-09 11:02:12 +01:00 • committed by Greg Kroah-Hartman

parent a587c46946

commit 908f6b1a20

1 changed files with 4 additions and 0 deletions

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arch/arm64/include/asm/barrier.h

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