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

[Beata Michalska]

On Tue, Oct 27, 2026 at 02:40:00PM +0800, Xuewen Yan wrote:
Hi,
> 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...
> 
Will send an update shortly.

---
BR
Beata
> 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
> >