Re: [PATCH v3] selftests/resctrl: Fix non-contiguous CBM for AMD

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On 6/26/24 10:55, Reinette Chatre wrote:
Hi Shuah,

Could you please consider this fix for inclusion into kselftests?

Thank you very much.

Reinette

On 6/11/24 3:18 PM, Babu Moger wrote:
The non-contiguous CBM test fails on AMD with:
Starting L3_NONCONT_CAT test ...
Mounting resctrl to "/sys/fs/resctrl"
CPUID output doesn't match 'sparse_masks' file content!
not ok 5 L3_NONCONT_CAT: test

AMD always supports non-contiguous CBM but does not report it via CPUID.

Fix the non-contiguous CBM test to use CPUID to discover non-contiguous
CBM support only on Intel.

Fixes: ae638551ab64 ("selftests/resctrl: Add non-contiguous CBMs CAT test")
Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>
---
v3: Reworked changelong.

v2: Moved the non-contiguous CBM verification to a new function
     arch_supports_noncont_cat.

v1: This was part of the series
     https://lore.kernel.org/lkml/cover.1708637563.git.babu.moger@xxxxxxx/
     Sending this as a separate fix per review comments.
---
  tools/testing/selftests/resctrl/cat_test.c | 32 +++++++++++++++-------
  1 file changed, 22 insertions(+), 10 deletions(-)


Applied to linux-kselftest fixes branch for 6.10-rc6

thanks,
-- Shuah





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