[PATCH v3 11/13] arm64: Implement branch predictor hardening for affected Cortex-A CPUs

Catalin Marinas catalin.marinas at arm.com
Mon Jan 15 10:01:27 PST 2018

On Tue, Jan 09, 2018 at 04:12:18PM +0000, Suzuki K. Poulose wrote:
> arm64: capabilities: Handle duplicate entries for a capability
> Sometimes a single capability could be listed multiple times with
> differing matches(), e.g, CPU errata for different MIDR versions.
> This breaks verify_local_cpu_feature() and this_cpu_has_cap() as
> we stop checking for a capability on a CPU with the first
> entry in the given table, which is not sufficient. Make sure we
> run the checks for all entries of the same capability. We do
> this by fixing __this_cpu_has_cap() to run through all the
> entries in the given table for a match and reuse it for
> verify_local_cpu_feature().
> Cc: Mark Rutland <mark.rutland at arm.com>
> Cc: Will Deacon <will.deacon at arm.com>
> Cc: Marc Zyngier <marc.zyngier at arm.com>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose at arm.com>
> ---
>  arch/arm64/kernel/cpufeature.c | 44 ++++++++++++++++++++++--------------------
>  1 file changed, 23 insertions(+), 21 deletions(-)

Applied. Thanks.


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