Re: [PATCH] selftests/resctrl: Add ARM vendor detection and fix non-contig CBM check

[Richard Cheng]

On Mon, May 25, 2026 at 07:51:16PM +0800, Fenghua Yu wrote:
> Hi, Richard,
> 
> On 5/25/26 19:39, Richard Cheng wrote:
> > aarch64 has no vendor_id in /proc/cpuinfo, so detect_vendor() returns 0
> > and arch_supports_noncont_cat() falls through to "return false".
> > L3_NONCONT_CAT spuriously fails on every ARM MPAM platform.
> > 
> > Define ARCH_ARM, short-circuite detect_vendor() to it on aarch64, and
> > add it to the AMD/Hygon alwasy-supports early-out in
> > arch_support_noncont_cat().
> > 
> > aarch64 has many implementers (ARM 0x41, NVIDIA 0x43, etc...) but MPAM
> > mandates non-contiguous CPBM uniformly, so per-implementer bits is not
> > needed here.
> > 
> > Signed-off-by: Richard Cheng <icheng@xxxxxxxxxx>
> 
> I see you have three patches for selftest. Seems they are together. But they
> are not assembled in a series like [PATCH 1/3], [PATCH 2/3], [PATCH 3/3].
> 
> Could you please send them in a series?
> 
> Thanks.
> 
> -Fenghua

Hi Fenghua,

Thanks, I'll organize them in a serie and send a v2.

Best regards,
Richard Cheng.