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CONFIG_ARM_ERRATA_720789: ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID

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The Linux kernel configuration item CONFIG_ARM_ERRATA_720789:

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This option enables the workaround for the 720789 Cortex-A9 (prior to r2p0) erratum. A faulty ASID can be sent to the other CPUs for the broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. As a consequence of this erratum, some TLB entries which should be invalidated are not, resulting in an incoherency in the system page tables. The workaround changes the TLB flushing routines to invalidate entries regardless of the ASID.



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