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CONFIG_CAVIUM_ERRATUM_27456: Cavium erratum 27456: Broadcast TLBI instructions may cause icache corruption

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The Linux kernel configuration item CONFIG_CAVIUM_ERRATUM_27456:

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On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI instructions may cause the icache to become corrupted if it contains data for a non-current ASID. The fix is to invalidate the icache when changing the mm context.

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