Hi Catalin, > On Sat, 14 Mar 2026 17:51:25 +0000, Yeoreum Yun wrote: > > Since Armv9.6, FEAT_LSUI supplies the load/store instructions for > > previleged level to access to access user memory without clearing > > PSTATE.PAN bit. > > > > This patchset support FEAT_LSUI and applies it mainly in > > futex atomic operation and others. > > > > [...] > > Applied to arm64 (for-next/feat_lsui), thanks!
Thanks! > > 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/) However, > models may support the > combination and disabling SWP emulation feels pretty artificial. But I'm not sure this is a sufficient rationale for supporting SWP with LSUI, since it's highly unlikely to encounter a real CPU that supports both 32-bit EL0 and FEAT_LSUI. Anyway, it's fair enough to drop 6/8 right now. But I appreciate whether it would be good to support SWP emulation with LSUI so that let me respin for it with the former patch. [...] -- Sincerely, Yeoreum Yun
