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

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Date:   Fri, 18 Aug 2017 19:17:57 +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 18:58, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Ard Biesheuvel <ard.biesheuvel@...aro.org> wrote:
>
>> 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,  [...]
>
> Note that I actually agreed with your list of checkpatch bogosities - the one I
> commented on was the only thing that needed fixing, IMHO.
>

Ah ok. Well, I think the code has improved slightly in some ways as a
result, so I will just back out the bogus changes for v3.