Messages in this thread | | | Date | Wed, 15 Feb 2023 11:45:32 +0800 | From | Changbin Du <> | Subject | Re: [PATCH v4] riscv: patch: Fixup lockdep warning in stop_machine |
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On Wed, Feb 15, 2023 at 09:24:33AM +0800, Guo Ren wrote: > On Wed, Feb 15, 2023 at 8:22 AM Conor Dooley <conor@kernel.org> wrote: > > > > Hey Changbin, > > > > On Thu, Feb 02, 2023 at 07:41:16PM +0800, Changbin Du wrote: > > > The task of ftrace_arch_code_modify(_post)_prepare() caller is > > > stop_machine, whose caller and work thread are of different tasks. The > > > lockdep checker needs the same task context, or it's wrong. That means > > > it's a bug here to use lockdep_assert_held because we don't guarantee > > > the same task context. > I'm trying to delete all stop_machine in riscv, from ftrace to kprobe. > When I have done, we needn't this patch. > Which approch would you use? I looked through the riscv-spec, but didn't find any description abount concurrent modification and execution.
> > > > > > 2.25.1 > > > > > > > -- > Best Regards > Guo Ren
-- Cheers, Changbin Du
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