Re: [PATCH v5 00/21] kprobes: Unify kretprobe trampoline handlers and make kretprobe lockless

Peter Zijlstra
2020-09-01T19:08:50Z

On Sat, Aug 29, 2020 at 09:59:49PM +0900, Masami Hiramatsu wrote:
> Masami Hiramatsu (16):
> kprobes: Add generic kretprobe trampoline handler
> x86/kprobes: Use generic kretprobe trampoline handler
> arm: kprobes: Use generic kretprobe trampoline handler
> arm64: kprobes: Use generic kretprobe trampoline handler
> arc: kprobes: Use generic kretprobe trampoline handler
> csky: kprobes: Use generic kretprobe trampoline handler
> ia64: kprobes: Use generic kretprobe trampoline handler
> mips: kprobes: Use generic kretprobe trampoline handler
> parisc: kprobes: Use generic kretprobe trampoline handler
> powerpc: kprobes: Use generic kretprobe trampoline handler
> s390: kprobes: Use generic kretprobe trampoline handler
> sh: kprobes: Use generic kretprobe trampoline handler
> sparc: kprobes: Use generic kretprobe trampoline handler
> kprobes: Remove NMI context check
> kprobes: Free kretprobe_instance with rcu callback
> kprobes: Make local used functions static
>
> Peter Zijlstra (5):
> llist: Add nonatomic __llist_add() and __llist_dell_all()
> kprobes: Remove kretprobe hash
> asm-generic/atomic: Add try_cmpxchg() fallbacks
> freelist: Lock less freelist
> kprobes: Replace rp->free_instance with freelist

This looks good to me, do you want me to merge them through -tip? If so,
do we want to try and get them in this release still?

Ingo, opinions? This basically fixes a regression cauesd by

0d00449c7a28 ("x86: Replace ist_enter() with nmi_enter()")