On Thu, Apr 14, 2022 at 07:55:44PM +0800, Tianjia Zhang wrote: > Allow userspace to detect support for SME (Scalable Matrix Extension) > by providing a hwcap for it, using the official feature name FEAT_SME, > declared in ARM DDI 0487H.a specification. There's already a hwcap for the core feature and all the subfeatures added as part of the series I've been posting for SME: https://lore.kernel.org/linux-arm-kernel/20220408114328.1401034-1-broonie@xxxxxxxxxx/ Why add something independently, especially given that there is no way for userspace to do anything constructive with the feature without the rest of the kernel support? Any attempt to use SME instructions without kernel support will trap and generate a SIGILL even if the feature is present in hardware. Do you have a system with SME that you're trying to use? Review/testing on the current series would be appreciated.
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