linux-kernel - Re: [PATCH 1/4] tracing: add error

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Message-ID: <20210114095232.7ba3f9a8@gandalf.local.home>
Date:   Thu, 14 Jan 2021 09:52:32 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexander Potapenko <glider@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Ingo Molnar <mingo@...hat.com>, Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH 1/4] tracing: add error_report trace points

On Thu, 14 Jan 2021 08:49:57 +0100
Alexander Potapenko <glider@...gle.com> wrote:

> We'll need to explicitly list the enum values once again in
> __print_symbolic(), right? E.g.:
> 
> enum debugging_tool {
>          TOOL_KFENCE,
>          TOOL_KASAN,
>          ...
> }
> 
> TP_printk(__print_symbolic(__entry->error_detector, TOOL_KFENCE,
> TOOL_KASAN, ...),

Usually what is done is to make this into a macro:

#define REPORT_TOOL_LIST \
  EM(KFENCE, kfence) \
  EMe(KASAN, kasan)

#undef EM
#undef EMe

#define EM(a,b) TRACE_DEFINE_ENUM(a)
#define EMe(a,b) TRACE_DEFINE_ENUM(a)

REPORT_TOOL_LIST

#undef EM
#undef EMe

#define EM(a, b) { a, b },
#define EMe(a, b) { a, b }

#define show_report_tool_list(val) \
	__print_symbolic(val, REPORT_TOOL_LIST)


[..]

 TP_printk("[%s] %lx", show_report_tool_list(__entry->error_detector),
    __entry->id)


This is done in several other trace event files.  For example, see
  include/trace/events/sock.h


-- Steve