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

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Message-ID: <95f421a3-383f-5d05-adaf-3d8188ae3a36@huawei.com>
Date:   Fri, 13 Jan 2023 09:15:18 +0800
From:   Li Huafei <lihuafei1@...wei.com>
To:     Mark Rutland <mark.rutland@....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 2023/1/12 19:00, Mark Rutland wrote:
> 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
> 

Okay, you've fixed it. Thanks for pointing out.

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