linux-kernel - Re: [PATCH 4/8] ftrace: Add DYNAMIC_FTRACE_WITH_CALL

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Message-ID: <Y7/oUy2fIOoq1yFC@FVFF77S0Q05N>
Date:   Thu, 12 Jan 2023 11:00:35 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Li Huafei <lihuafei1@...wei.com>
Cc:     catalin.marinas@....com, lenb@...nel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        mhiramat@...nel.org, ndesaulniers@...gle.com, ojeda@...nel.org,
        peterz@...radead.org, rafael.j.wysocki@...el.com,
        revest@...omium.org, robert.moore@...el.com, rostedt@...dmis.org,
        will@...nel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 4/8] ftrace: Add DYNAMIC_FTRACE_WITH_CALL_OPS

On Thu, Jan 12, 2023 at 02:48:45PM +0800, Li Huafei wrote:
> On 2023/1/9 21:58, Mark Rutland wrote:
> 
> > diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> > index 99f1146614c04..5eeb2776124c5 100644
> > --- a/include/linux/ftrace.h
> > +++ b/include/linux/ftrace.h
> > @@ -57,6 +57,9 @@ void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip);
> >  void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
> >  			       struct ftrace_ops *op, struct ftrace_regs *fregs);
> >  #endif
> > +extern const struct ftrace_ops ftrace_nop_ops;
> > +extern const struct ftrace_ops ftrace_list_ops;
> > +struct ftrace_ops *ftrace_find_unique_ops(struct dyn_ftrace *rec);
> 
> Hi Mark,

Hi Huafei,

Thanks for the reporrt.

> This patch has build issues on x86:
> 
>     CC      mm/readahead.o
>   In file included from include/linux/perf_event.h:52:0,
>                    from arch/x86/events/amd/lbr.c:2:
>   include/linux/ftrace.h:62:50: error: ‘struct dyn_ftrace’ declared inside parameter list will not be visible outside of this definition or declaration [-Werror]
>    struct ftrace_ops *ftrace_find_unique_ops(struct dyn_ftrace *rec);
> 
> Here we should need 'struct dyn_ftrace' forward declaration.

The build robot spotted this a couple of days ago (from my branch rather than
the list), and I fixed it there a couple of days ago. The relevant messages were:

  https://lore.kernel.org/oe-kbuild-all/202301100944.E0mV3kSO-lkp@intel.com/
  https://lore.kernel.org/oe-kbuild-all/Y72TJ3qQuvx3gIOi@FVFF77S0Q05N/#t

... and the updated commit is at:

  https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?h=arm64/ftrace/per-callsite-ops&id=acab29d6ea2f20d8d156cdd301ad9790bd1d888f


... I'll post a v2 with that folded in once this has had a bit more time to gather comments.

Thanks,	
Mark.