On Thu, Jul 16, 2026 at 11:52:36AM +0100, Mark Rutland wrote:
> > if (test_thread_flag(TIF_SME)) {
> > - unsigned long vq = sve_vq_from_vl(sme_vl);
> > - sysreg_clear_set_s(SYS_SMCR_EL1, SMCR_ELx_LEN, vq - 1);
> > + sysreg_cond_update_s(SYS_SMCR_EL1, task_smcr(current));
> > + isb();
> > }> What's the ISB for? That mysteriously appeared in v11 without > explanation. It wasn't in the original code, prior versions of the > series, or my suggested rework with the task_smcr() helper. > I don't believe it's necessary to add an ISB here. I can't remember or figure it out, I'll delete.
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