[PATCH v4 0/2] arm64: errata: Share broken AMU constant-counter handling

[Xuewen Yan]

Hi Beata,

Sorry for the late reply.

On Thu, Oct 1, 2026 at 5:00 PM Beata Michalska <beata.michalska at arm.com> wrote:
>
> This series factors out the existing Cortex-A510 erratum 2457168 AMU constant
> counter workaround into a generic broken AMU constant-counter capability,
> then wires Cortex-A725 erratum 3821522 into the same handling.
>

Has this patch only been applied to the A510 and A725 so far? As far
as I know, no chip has received a fix for this issue yet, including
the C1-Pro...

Thanks！
> ---
> v4:
> - use midr range instead of multi cap list
> - reword comment to be more generic
>
> v3:
> - splitted the commit and droped changes for cpucap_is_possible
> ---
>
> Beata Michalska (2):
>   arm64: errata: Factor out broken AMU const counter cap
>   arm64: errata: Add Cortex-A725 erratum 3821522 workaround
>
>  Documentation/arch/arm64/silicon-errata.rst |  2 ++
>  arch/arm64/Kconfig                          | 30 +++++++++++++++++++++
>  arch/arm64/kernel/cpu_errata.c              | 24 ++++++++++++-----
>  arch/arm64/kernel/cpufeature.c              |  2 +-
>  arch/arm64/kernel/topology.c                | 16 ++++++-----
>  arch/arm64/tools/cpucaps                    |  2 +-
>  6 files changed, 61 insertions(+), 15 deletions(-)
>
> --
> 2.43.0
>