linux-kernel - [PATCH v2 0/2] selftests/x86: AMX-related test improvements

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Date:   Mon, 11 Jul 2022 10:03:28 -0700
From:   "Chang S. Bae" <chang.seok.bae@...el.com>
To:     linux-kselftest@...r.kernel.org, shuah@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     dave.hansen@...ux.intel.com, tglx@...utronix.de, bp@...e.de,
        chang.seok.bae@...el.com
Subject: [PATCH v2 0/2] selftests/x86: AMX-related test improvements

Sorry for the delay in this update.

Changes from v1:
* Improve the skip message along with the changelog massage (Suah Khan).
* Simplify the feature support check (Suah Khan).

=== Cover Letter ===

A couple of test updates are included:

* With the STRICT_SIGALTSTACK_SIZE option [1,2], the kernel's altstack
  check becomes stringent. The x86 sigaltstack test is ignorant about this.
  Adjust the test now. This check was established [3] to ensure every AMX
  task's altstack is sufficient (regardless of that option) [4].

* The AMX test wrongly fails on non-AMX machines. Fix the code to skip the
  test instead.

The series is available in this repository:
  git://github.com/intel/amx-linux.git selftest

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/x86/Kconfig#n2432
[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kernel-parameters.txt#n5676
[3] 3aac3ebea08f ("x86/signal: Implement sigaltstack size validation")
[4] 4b7ca609a33d ("x86/signal: Use fpu::__state_user_size for sigalt stack validation")

Chang S. Bae (2):
  selftests/x86/signal: Adjust the test to the kernel's altstack check
  selftests/x86/amx: Fix the test to avoid failure when AMX is
    unavailable

 tools/testing/selftests/x86/amx.c         | 31 ++++++++---------------
 tools/testing/selftests/x86/sigaltstack.c | 14 +++++++++-
 2 files changed, 23 insertions(+), 22 deletions(-)

base-commit: 32346491ddf24599decca06190ebca03ff9de7f8
-- 
2.17.1