Ignore non-existing CP15 barrier instructions emulation (#3285)
CP15 barrier instruction emulation only exists on arm64 architecture. Avoid sysctl writing an error to the journal when the setting doesn't exist by prepending a dash.
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# disable "deprecated CP15 Barrier instruction" warnings
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# https://www.kernel.org/doc/Documentation/arm64/legacy_instructions.txt
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abi.cp15_barrier = 2
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-abi.cp15_barrier = 2
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