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A signal frame with SVE may validly either be a bare struct sve_context or a struct sve_context followed by vector length dependent register data. Support either in the generic helpers for the signal tests, and while we're at it validate the SVE vector length reported. Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20210819134245.13935-3-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>