Hi, > On Sun, 14 Dec 2025 11:22:48 +0000, > Yeoreum Yun <[email protected]> wrote: > > > > Apply the FEAT_LSUI instruction to emulate the deprecated swpX > > instruction, so that toggling of the PSTATE.PAN bit can be removed when > > LSUI-related instructions are used. > > > > Signed-off-by: Yeoreum Yun <[email protected]> > > It really begs the question: what are the odds of ever seeing a CPU > that implements both LSUI and AArch32? > > This seems extremely unlikely to me.
Well, I'm not sure how many CPU will have both ID_AA64PFR0_EL1.EL0 bit as 0b0010 and FEAT_LSUI (except FVP currently) -- at least the CPU what I saw, most of them set ID_AA64PFR0_EL1.EL0 as 0b0010. If you this seems useless, I don't have any strong comments whether drop patches related to deprecated swp instruction parts (patch 8-9 only) or not. (But, I hope to pass this decision to maintaining perspective...) > > M. > > -- > Without deviation from the norm, progress is not possible. -- Sincerely, Yeoreum Yun
