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[ Upstream commit9e8ebfe677] Sincef916dd32a9("arm64/fpsimd: ptrace: Mandate SVE payload for streaming-mode state") we reject attempts to write to the streaming mode regset even if there is no register data supplied, causing the tests for setting vector lengths and setting SVE_VL_INHERIT in sve-ptrace to spuriously fail. Set the flag to avoid the issue, we still support not supplying register data. Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20250609-kselftest-arm64-ssve-fixups-v2-3-998fcfa6f240@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>