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thead-kernel/arch/riscv/include/asm
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Jisheng Zhang 556f057aca riscv: cmpxchg: implement arch_cmpxchg64_{relaxed|acquire|release} 
After selecting ARCH_USE_CMPXCHG_LOCKREF, one straight futher
optimization is implementing the arch_cmpxchg64_relaxed() because the
lockref code does not need the cmpxchg to have barrier semantics. At
the same time, implement arch_cmpxchg64_acquire and
arch_cmpxchg64_release as well.

However, on both TH1520 and JH7110 platforms, I didn't see obvious
performance improvement with Linus' test case [1]. IMHO, this may
be related with the fence and lr.d/sc.d hw implementations. In theory,
lr/sc without fence could give performance improvement over lr/sc plus
fence, so add the code here to leave performance improvement room on
newer HW platforms.

Link: http://marc.info/?l=linux-fsdevel&m=137782380714721&w=4 [1]
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
2023-11-29 23:46:21 +08:00
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vdso
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asid.h
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asm-offsets.h
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asm-prototypes.h
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asm.h
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atomic.h
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barrier.h
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bitops.h
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bug.h
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cache.h
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cacheflush.h
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cacheinfo.h
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clint.h
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clocksource.h
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cmpxchg.h
riscv: cmpxchg: implement arch_cmpxchg64_{relaxed|acquire|release}
2023-11-29 23:46:21 +08:00
compat.h
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cpu_ops.h
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cpuidle.h
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csr.h
chore: restore only support v0p7
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current.h
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delay.h
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efi.h
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elf.h
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fence.h
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fixmap.h
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ftrace.h
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futex.h
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gdb_xml.h
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hugetlb.h
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hwcap.h
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image.h
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io.h
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irq_work.h
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irq.h
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irqflags.h
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jump_label.h
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kasan.h
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Kbuild
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kdebug.h
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kexec.h
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kgdb.h
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kprobes.h
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kvm_host.h
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kvm_types.h
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kvm_vcpu_timer.h
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linkage.h
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mmio.h
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mmu_context.h
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mmu.h
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module.h
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module.lds.h
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page.h
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parse_asm.h
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patch.h
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pci.h
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perf_event.h
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pgalloc.h
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pgtable-32.h
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pgtable-64.h
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pgtable-bits.h
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pgtable.h
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probes.h
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processor.h
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ptdump.h
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ptrace.h
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sbi.h
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seccomp.h
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sections.h
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set_memory.h
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smp.h
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soc.h
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sparsemem.h
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spinlock_types.h
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spinlock.h
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stackprotector.h
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string.h
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switch_to.h
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syscall.h
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thread_info.h
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timex.h
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tlb.h
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tlbflush.h
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uaccess.h
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unistd.h
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uprobes.h
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vdso.h
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vermagic.h
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vmalloc.h
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word-at-a-time.h
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