linux-kernel - Re: [PATCH 5/5] kernel: tracepoints: add support for relative references

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Date:   Fri, 18 Aug 2017 10:24:10 +0100
From:   Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Kees Cook <keescook@...omium.org>,
        Will Deacon <will.deacon@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Garnier <thgarnie@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Petr Mladek <pmladek@...e.com>, Ingo Molnar <mingo@...hat.com>,
        James Morris <james.l.morris@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nicolas Pitre <nico@...aro.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Jessica Yu <jeyu@...nel.org>
Subject: Re: [PATCH 5/5] kernel: tracepoints: add support for relative references

On 18 August 2017 at 09:36, Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
> On 18 August 2017 at 09:26, Ingo Molnar <mingo@...nel.org> wrote:
>>
>> * Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
>>
>>> -static void for_each_tracepoint_range(struct tracepoint * const *begin,
>>> -             struct tracepoint * const *end,
>>> +static void for_each_tracepoint_range(const void *begin, const void *end,
>>>               void (*fct)(struct tracepoint *tp, void *priv),
>>>               void *priv)
>>>  {
>>> +#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
>>> +     const signed int *iter;
>>> +
>>> +     if (!begin)
>>> +             return;
>>> +     for (iter = begin; iter < (signed int *)end; iter++) {
>>> +             fct((struct tracepoint *)((unsigned long)iter + *iter), priv);
>>> +     }
>>
>> I think checkpatch is correct here to complain about the unnecessary curly braces
>> here.
>>
>
> Fair enough. I will clean up to the extent feasible.
>

OK, in an honest attempt to at least remove as many of the checkpatch
errors as I can, I am running into the paradoxical situation where I
either get

ERROR: space required after that ',' (ctx:VxO)
#83: FILE: include/linux/init.h:232:
+#define console_initcall(fn) ___define_initcall(fn,, .con_initcall)

or

ERROR: space prohibited before that ',' (ctx:WxW)
#156: FILE: include/linux/init.h:232:
+#define console_initcall(fn) ___define_initcall(fn, , .con_initcall)
                                                    ^
which I think may be checkpatch trying to give me a hint that I have
done enough work for the week, and should spend some time by the pool
instead.