[PATCH v2] kselftest/arm64: signal: fix/refactor SVE vector length enumeration

[Mark Brown]

On Mon, Aug 19, 2024 at 01:57:21PM +0100, Andre Przywara wrote:
> Currently a number of SVE/SME related tests have almost identical
> functions to enumerate all supported vector lengths. However over time
> the copy&pasted code has diverged, allowing some bugs to creep in:
> - fake_sigreturn_sme_change_vl reports a failure, not a SKIP if only
>   one vector length is supported (but the SVE version is fine)
> - fake_sigreturn_sme_change_vl tries to set the SVE vector length, not
>   the SME one (but the other SME tests are fine)
> - za_no_regs keeps iterating forever if only one vector length is
>   supported (but za_regs is correct)

Reviewed-by: Mark Brown <broonie at kernel.org>
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