linux-kernel - Re: [PATCH v2 3/3] selftests: ublk: add test to verify that feat

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Message-ID: <CAFj5m9+ZFkuq=n9R=d5N_ePzrtvx44TdR+YniCJVEWu_P+DGKw@mail.gmail.com>
Date: Fri, 19 Sep 2025 08:58:28 +0800
From: Ming Lei <ming.lei@...hat.com>
To: Uday Shankar <ushankar@...estorage.com>
Cc: Caleb Sander Mateos <csander@...estorage.com>, Shuah Khan <shuah@...nel.org>, 
	linux-block@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] selftests: ublk: add test to verify that feat_map
 is complete

On Fri, Sep 19, 2025 at 3:34 AM Uday Shankar <ushankar@...estorage.com> wrote:
>
> Add a test that verifies that the currently running kernel does not
> report support for any features that are unrecognized by kublk. This
> should catch cases where features are added without updating kublk's
> feat_map accordingly, which has happened multiple times in the past (see
> [1], [2]).
>
> Note that this new test may fail if the test suite is older than the
> kernel, and the newer kernel contains a newly introduced feature. I
> believe this is not a use case we currently care about - we only care
> about newer test suites passing on older kernels.
>
> [1] https://lore.kernel.org/linux-block/20250606214011.2576398-1-csander@purestorage.com/t/#u
> [2] https://lore.kernel.org/linux-block/2a370ab1-d85b-409d-b762-f9f3f6bdf705@nvidia.com/t/#m1c520a058448d594fd877f07804e69b28908533f
>
> Signed-off-by: Uday Shankar <ushankar@...estorage.com>

Reviewed-by: Ming Lei <ming.lei@...hat.com>

Thanks,