linux-kernel - Re: [PATCH 1/2] s390: delete unneeded #include <linux/kconfig.h> from facilities

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1478596565.29112.40.camel@tiscali.nl>
Date:   Tue, 08 Nov 2016 10:16:05 +0100
From:   Paul Bolle <pebolle@...cali.nl>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-s390@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] s390: delete unneeded #include <linux/kconfig.h>
 from facilities_src.h

Hi Mashiro,

On Tue, 2016-11-08 at 10:50 +0900, Masahiro Yamada wrote:
> 2016-11-07 21:52 GMT+09:00 Paul Bolle <pebolle@...cali.nl>:
> > So it seems the odd $(LINUXINCLUDE) variable in that Makefile could be
> > replaced with something like:
> >     -include $(srctree)/include/generated/autoconf.h
> 
> This would break O= build because autoconf.h is a generated file.
> 
> Rather, it should be
>       -include $(objtree)/include/generated/autoconf.h

Three cheers for weasel words like "something like"!

> I thought of this at first, but I was not quite sure
> if the file path include/generated/autoconf.h is a guaranteed interface.
> 
> Basically, now we are supposed to include autoconf.h via kconfig.h.

Yes, that seems to go back to commit 2a11c8ea20bf ("kconfig: Introduce
IS_ENABLED(), IS_BUILTIN() and IS_MODULE()"). And when the current approach to
the IS_*() macros was introduced - with that breathtaking hack that introduced
__is_defined() - this was no longer needed but was not changed again.

> So, I thought $(LINUXINCLUDE) is a more stable interface
> than specifying the exact path to autoconf.h
> 
> I doubt that nobody would try to change it, but it is just two my cents.

A bit of cruft accumulated around LINUXINCLUDE: a few dubious uses of it (and
I think this is one of those); typos (ie, LINUX_INCLUDE); the pointless
USERINCLUDE; things like that. It would be nice to remove that cruft. But it
needs to be done carefully.

> Anyway, arch/x86/boot/Makefile already
> referenced the path to autoconf.h
> 
> So, if you want to change it, I will not oppose to it.


Paul Bolle