This implements [cmp]xchgXX() macros using Zacas and Zabha extensions and finally uses those newly introduced macros to add support for qspinlocks: note that this implementation of qspinlocks satisfies the forward progress guarantee. Thanks to Guo and Leonardo for their work! Alexandre Ghiti (5): riscv: Implement cmpxchg32/64() using Zacas riscv: Implement cmpxchg8/16() using Zabha riscv: Implement arch_cmpxchg128() using Zacas riscv: Implement xchg8/16() using Zabha riscv: Add qspinlock support based on Zabha extension Guo Ren (2): asm-generic: ticket-lock: Reuse arch_spinlock_t of qspinlock asm-generic: ticket-lock: Add separate ticket-lock.h .../locking/queued-spinlocks/arch-support.txt | 2 +- arch/riscv/Kconfig | 35 ++++++ arch/riscv/Makefile | 21 ++++ arch/riscv/include/asm/Kbuild | 4 +- arch/riscv/include/asm/cmpxchg.h | 114 ++++++++++++++++-- arch/riscv/include/asm/hwcap.h | 1 + arch/riscv/include/asm/spinlock.h | 39 ++++++ arch/riscv/kernel/cpufeature.c | 1 + arch/riscv/kernel/setup.c | 18 +++ include/asm-generic/qspinlock.h | 2 + include/asm-generic/spinlock.h | 87 +------------ include/asm-generic/spinlock_types.h | 12 +- include/asm-generic/ticket_spinlock.h | 105 ++++++++++++++++ 13 files changed, 336 insertions(+), 105 deletions(-) create mode 100644 arch/riscv/include/asm/spinlock.h create mode 100644 include/asm-generic/ticket_spinlock.h -- 2.39.2
