linux-kernel - Re: [PATCH 12/16] asm-generic: siginfo: remove obsolete #ifdefs

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Message-ID: <87fu51b4ao.fsf@xmission.com>
Date:   Thu, 15 Mar 2018 13:07:59 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 12/16] asm-generic: siginfo: remove obsolete #ifdefs

Arnd Bergmann <arnd@...db.de> writes:

> On Thu, Mar 15, 2018 at 12:37 PM, Eric W. Biederman
> <ebiederm@...ssion.com> wrote:
>>> On Thu, Mar 15, 2018 at 11:06 AM, Eric W. Biederman
>
>>> That seems reasonable. If you send me a patch with a proper
>>> changelog (I don't think I could explain this well enough), I'll
>>> add it to the series.
>>
>> I just realized you can also remove the #ifdefs for BUS_MCEERR_AR,
>> BUS_MCEERR_AO, and SEGV_BNDERR.  As those si_codes are now always
>> defined.  That description I expect you can handle.
>
> My existing patch already does this, and I've added a note to the changelog
> as well now.

I did not see the changes to kernel/signal.c and fs/signalfd.c that
remove the #ifdef BUS_MCERR_AR etc.  Did I miss that patch.

>> For a description of the above change how does this sound?
>>
>> Unlike system call numbers the assignment of si_codes has never had a
>> reason to be made per architecture.  Some architectures have had unique
>> conditions to report and reporting those conditions needed new si_codes.
>> Nothing has ever needed si_codes to have different values on different
>> architectures.  The si_code space is vast so even with defining all
>> si_codes on all architectures there is no danger in running out of
>> si_code values.
>>
>> The history of the si_codes BUS_MCEERR_AR, BUS_MCEER_AO, SEGV_BNDERR,
>> and SEGV_PKUERR show that a need of one architecture frequently becomes
>> a need of another architecture which makes sharing si_codes between
>> architectures a positive benefit and something to be encouraged.
>>
>> Where there are no conflicts with the historical ia64 arch specific
>> si_codes and any other si_codes make them generic si_codes.  We might
>> need them on another architecture someday.
>>
>> This leaves only the good example of arch generic si_codes in the kernel
>> for future architectures and architecture enhancments to follow.
>> Without bad examples to follow it should be easy to avoid the mistakes
>> of the past.
>
> Ok, done. I've listed you as 'Suggested-by' for that patch. Since the
> changelog is way more work than the actual change, I would have
> made you the author of that patch, but I don't have a Signed-off-by
> from you for it.

For however much it helps.

Reviewed-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Eric