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'stack->stack_no' represents the order that a stack appears in its PEC. Its primary use is in XSCOM address space calculation in pnv_phb4_xscom_realize() when calculating the memory region offset. This attribute is redundant with phb->phb_id, which is calculated via pnv_phb4_pec_get_phb_id() using stack->stack_no information. It'll also be awkward to assign it when dealing with PECs and PHBs only in a future patch. A new pnv_phb4_get_phb_stack_no() helper is introduced to eliminate most of the stack->stack_no uses we have. The only use left after this patch is during pnv_pec_stk_default_phb_realize() when calculating phb_id, which will also handled in the next patches. Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Reviewed-by: Cédric Le Goater <clg@kaod.org> Message-Id: <20220114180719.52117-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>