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Following the refactoring of the context switching test, the ptrace test is another component reusable for other xstate features. As part of this restructuring, add a missing check to validate the user_xstateregs->xstate_fx_sw field in the ABI. Also, replace err() and fatal_error() with ksft_exit_fail_msg() for consistency in error handling. Expected output: $ amx_64 ... [RUN] AMX Tile data: inject xstate via ptrace(). [OK] 'xfeatures' in SW reserved area was correctly written [OK] xstate was correctly updated. Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20250226010731.2456-6-chang.seok.bae@intel.com