arm64: kpti: Whitelist Cortex-A CPUs that don't implement the CSV3 field
commit 2a355ec25729053bb9a1a89b6c1d1cdd6c3b3fb1 upstream. While the CSV3 field of the ID_AA64_PFR0 CPU ID register can be checked to see if a CPU is susceptible to Meltdown and therefore requires kpti to be enabled, existing CPUs do not implement this field. We therefore whitelist all unaffected Cortex-A CPUs that do not implement the CSV3 field. Signed-off-by: NWill Deacon <will.deacon@arm.com> Cc: Niklas Cassel <niklas.cassel@linaro.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Conflicts: arch/arm64/kernel/cpufeature.c [yyl: adjust context] Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
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