linux-kernel - Re: [PATCH 2/7] Compiler Attributes: use the no-underscores syntax

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Date:   Fri, 31 Aug 2018 21:17:48 +0200
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Eli Friedman <efriedma@...eaurora.org>,
        Christopher Li <sparse@...isli.org>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg KH <gregkh@...uxfoundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Joe Perches <joe@...ches.com>,
        Dominique Martinet <asmadeus@...ewreck.org>
Subject: Re: [PATCH 2/7] Compiler Attributes: use the no-underscores syntax

Hi Nick,

On Fri, Aug 31, 2018 at 8:51 PM, Nick Desaulniers
<ndesaulniers@...gle.com> wrote:
> On Fri, Aug 31, 2018 at 10:05 AM Miguel Ojeda
>> diff --git a/include/linux/compiler.h b/include/linux/compiler.h
>> index 7c0157d50964..e0e55eb3f242 100644
>> --- a/include/linux/compiler.h
>> +++ b/include/linux/compiler.h
>> @@ -23,7 +23,7 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
>>  #define __branch_check__(x, expect, is_constant) ({                    \
>>                         long ______r;                                   \
>>                         static struct ftrace_likely_data                \
>> -                               __attribute__((__aligned__(4)))         \
>> +                               __attribute__((aligned(4)))             \
>
> Can this be __aligned(4)? As in make use of the newly feature detected
> attributes?

I was thinking of doing this in a full conversion over the full kernel
tree in separate patch(es) after the 7th (maybe for v3?). In
particular, aligned and section have a lot of them:
  * 349 ((aligned
  * 66 ((__aligned
  * 76 ((section
  * 48 ((__section

As well as others like:
  * 218 ((unused
  * 14 ((__unused

But indeed, good catches! These ones I can do it directly here since I
am editing them anyway.

>
> With the above changes requested (or follow up patch added to the series):
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
>
> Also,
> Series looks great, trying to provide reviews one by one, just very
> busy today (and Monday off).

Thanks a lot!

Cheers,
Miguel