Hi Richard, On 7/21/26 8:59 PM, Richard Cheng wrote: > L3_CAT measures cache isolation, which requires at least one cache bit > that is not shared with non-CPU agents, i.e. cbm_mask & ~shareable_bits > must be non-zero. On MPAM, shareable_bits == cbm_mask is a legitimate > state, so there are situations in which no bit can be reported as > exclusive. > > Previously get_mask_no_shareable() was invoked inside cat_run_test() > and silently returned -1, which surfaced as a test failure on arm64 > MPAM systems. > > Implement cat_feature_check() to perform the same check at feature-check > time. It prints a diagnostic and returns false so the test case is > skipped instead of failing. > > Tested-by: Chen Yu <[email protected]> > Reviewed-by: Ilpo Järvinen <[email protected]> > Signed-off-by: Richard Cheng <[email protected]> > ---
This patch is unchanged from v3. My comments against v3 still apply: https://lore.kernel.org/lkml/[email protected]/ As noted there, this issue does not just impact aarch64. Could you please split this patch from this series? When it is ready I would like to make a request for its inclusion in the next cycle. Thank you. Reinette
