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Use fault-injection to test partial TTM swapout and interrupted swapin. Return -EINTR for swapin to test the callers ability to handle and restart the swapin, and on swapout perform a partial swapout to test that the swapin and release_shrunken functionality. v8: - Use the core fault-injection system. v9: - Fix compliation failure for !CONFIG_FAULT_INJECTION Cc: Christian König <christian.koenig@amd.com> Cc: Somalapuram Amaranath <Amaranath.Somalapuram@amd.com> Cc: Matthew Brost <matthew.brost@intel.com> Cc: <dri-devel@lists.freedesktop.org> Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Christian König <christian.koenig@amd.com> Link: https://lore.kernel.org/intel-xe/20250305092220.123405-4-thomas.hellstrom@linux.intel.com