RSEQ_CS_FLAG_SLICE_EXT_ENABLED
rseqfl |= RSEQ_CS_FLAG_SLICE_EXT_ENABLED;
current->rseq.slice.state.enabled = !!(rseqfl & RSEQ_CS_FLAG_SLICE_EXT_ENABLED);
valid |= RSEQ_CS_FLAG_SLICE_EXT_ENABLED;
rflags &= ~RSEQ_CS_FLAG_SLICE_EXT_ENABLED;
rflags |= RSEQ_CS_FLAG_SLICE_EXT_ENABLED;