On Fri, Mar 27, 2026 at 01:56:11PM +0000, Yeoreum Yun wrote: > > I decided to drop patch [6/8] (arm64: armv8_deprecated: disable swp > > emulation when FEAT_LSUI present). The way FEAT_LSUI support looks now, > > we still have uaccess_enable_privileged() working properly and we could > > even support SWP emulation using exclusives. While it's highly unlikely > > to see both 32-bit EL0 and FEAT_LSUI in practice, > > This is one of decisive reason to drop the swp emulation with LSUI > (https://lore.kernel.org/all/aXDbBKhE1SdCW6q4@willie-the-truck/)
Ah, I forgot about this discussion. It's a valid point, I just thought it's unnecessary given that __uaccess_disable_hw_pan() still works. If we want strict no PAN, I can add it back (really small patch). I wonder whether we should also add a WARN_ON_ONCE(cpus_have_final_cap(ARM64_HAS_LSUI)) to the pan disabling function. Not urgent though. -- Catalin
