From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx> Palmer: Peter sent an RFC out about a year ago <https://lore.kernel.org/lkml/YHbBBuVFNnI4kjj3@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/>, but after a spirited discussion it looks like we lost track of things. IIRC there was broad consensus on this being the way to go, but there was a lot of discussion so I wasn't sure. Given that it's been a year, I figured it'd be best to just send this out again formatted a bit more explicitly as a patch. This has had almost no testing (just a build test on RISC-V defconfig), but I wanted to send it out largely as-is because I didn't have a SOB from Peter on the code. I had sent around something sort of similar in spirit, but this looks completely re-written. Just to play it safe I wanted to send out almost exactly as it was posted. I'd probably rename this tspinlock and tspinlock_types, as the mis-match kind of makes my eyes go funny, but I don't really care that much. I'll also go through the other ports and see if there's any more candidates, I seem to remember there having been more than just OpenRISC but it's been a while. I'm in no big rush for this and given the complex HW dependencies I think it's best to target it for 5.19, that'd give us a full merge window for folks to test/benchmark it on their systems to make sure it's OK. RISC-V has a forward progress guarantee so we should be safe, but these can always trip things up. Guo: Update V2 with Arnd's suggestion [1]. [1] https://lore.kernel.org/linux-arch/CAK8P3a0NMPVGVw7===uEOtNnu1hr1GqimMbZT+Kea1CUxRvPmw@xxxxxxxxxxxxxx/raw Changes in V2: - Follow Arnd suggestion to make the patch series more generic. - Add csky in the series. - Combine RISC-V's two patches into one. - Modify openrisc's patch to suit the new generic version. Guo Ren (1): csky: Move to generic ticket-spinlock Palmer Dabbelt (1): RISC-V: Move to ticket-spinlocks & RW locks Peter Zijlstra (3): asm-generic: ticket-lock: New generic ticket-based spinlock asm-generic: qspinlock: Indicate the use of mixed-size atomics openrisc: Move to ticket-spinlock arch/csky/include/asm/Kbuild | 3 +- arch/csky/include/asm/spinlock.h | 89 -------------- arch/csky/include/asm/spinlock_types.h | 27 ----- arch/openrisc/Kconfig | 1 - arch/openrisc/include/asm/Kbuild | 7 +- arch/openrisc/include/asm/spinlock.h | 27 ----- arch/openrisc/include/asm/spinlock_types.h | 7 -- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/Kbuild | 2 + arch/riscv/include/asm/spinlock.h | 135 --------------------- arch/riscv/include/asm/spinlock_types.h | 25 ---- include/asm-generic/qspinlock.h | 30 +++++ include/asm-generic/spinlock.h | 11 +- include/asm-generic/spinlock_types.h | 15 +++ include/asm-generic/ticket-lock-types.h | 11 ++ include/asm-generic/ticket-lock.h | 86 +++++++++++++ 16 files changed, 157 insertions(+), 320 deletions(-) delete mode 100644 arch/csky/include/asm/spinlock.h delete mode 100644 arch/csky/include/asm/spinlock_types.h delete mode 100644 arch/openrisc/include/asm/spinlock.h delete mode 100644 arch/openrisc/include/asm/spinlock_types.h delete mode 100644 arch/riscv/include/asm/spinlock.h delete mode 100644 arch/riscv/include/asm/spinlock_types.h create mode 100644 include/asm-generic/spinlock_types.h create mode 100644 include/asm-generic/ticket-lock-types.h create mode 100644 include/asm-generic/ticket-lock.h -- 2.25.1
