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

From: Chang S. Bae
Date: Mon Jul 11 2022 - 13:12:56 EST

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

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

base-commit: 32346491ddf24599decca06190ebca03ff9de7f8