From: Linus Torvalds <torvalds@linux-foundation.org>
To: Kees Cook <keescook@chromium.org>
Cc: Ulf Magnusson <ulfalizer@gmail.com>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Andrew Morton <akpm@linux-foundation.org>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
"Luis R . Rodriguez" <mcgrof@suse.com>,
Randy Dunlap <rdunlap@infradead.org>,
Sam Ravnborg <sam@ravnborg.org>,
Michal Marek <michal.lkml@markovi.net>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Pavel Machek <pavel@ucw.cz>,
linux-s390 <linux-s390@vger.kernel.org>,
Jiri Kosina <jkosina@suse.cz>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Tejun Heo <tj@kernel.org>, Ingo Molnar <mingo@kernel.org>,
"Van De Ven, Arjan" <arjan.van.de.ven@intel.com>,
Arnd Bergmann <arnd@arndb.de>
Subject: Re: [RFC PATCH 4/7] kconfig: support new special property shell=
Date: Sun, 11 Feb 2018 11:42:44 -0800 [thread overview]
Message-ID: <CA+55aFyj-CfvHoRtoDVHarMOcoDjyH5b9E6QecW7yHZo-Ok31A@mail.gmail.com> (raw)
In-Reply-To: <CA+55aFz3gUKQMr-X-b=ytLPX0AjGUaXNtLSUQ0_xZwZuDU33RQ@mail.gmail.com>
On Sun, Feb 11, 2018 at 10:13 AM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> That actually sounds like we could just
>
> (a) make gcc 4.5 be the minimum required version
>
> (b) actually error out if we find a bad compiler
Just to explain why that's different from what we do not (apart from
the "error out" thing to actually actively discourage broken
compilers): it simplifies things if we can just add a trivial check as
part of the build process rather than as part of the configuration.
If we don't have to make it part of the configuration, we can use all
the normal Kconfig rules and build rules, and then we can add the
error check to any number of places where we already do various object
file munging.
For example, it would be pretty trivial to do the "check that there's
the right segment access" as part of link-vmlinux.sh or something.
And that would allow us to just use all the regular config
infrastructure, including the (hopefully by 4.17) "cc-option" thing at
Kconfig time.
Linus
next prev parent reply other threads:[~2018-02-11 19:42 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-08 16:19 [RFC PATCH 0/7] Kconfig: add new special property shell= to test compiler options in Kconfig Masahiro Yamada
2018-02-08 16:19 ` [RFC PATCH 1/7] kbuild: remove kbuild cache Masahiro Yamada
2018-02-08 16:19 ` [RFC PATCH 2/7] kconfig: add xrealloc() helper Masahiro Yamada
2018-02-08 16:19 ` [RFC PATCH 3/7] kconfig: remove const qualifier from sym_expand_string_value() Masahiro Yamada
2018-02-08 16:19 ` [RFC PATCH 4/7] kconfig: support new special property shell= Masahiro Yamada
2018-02-09 5:30 ` Ulf Magnusson
2018-02-09 9:19 ` Masahiro Yamada
2018-02-09 12:46 ` Ulf Magnusson
2018-02-09 20:46 ` Kees Cook
2018-02-10 5:48 ` Ulf Magnusson
2018-02-10 7:12 ` Masahiro Yamada
2018-02-10 7:49 ` Ulf Magnusson
2018-02-10 8:05 ` Ulf Magnusson
2018-02-10 8:55 ` Ulf Magnusson
2018-02-10 9:21 ` Ulf Magnusson
2018-02-10 18:05 ` Randy Dunlap
2018-02-11 2:00 ` Kevin Easton
2018-02-10 19:23 ` Kees Cook
2018-02-10 20:08 ` Linus Torvalds
2018-02-11 4:13 ` Kees Cook
2018-02-11 4:46 ` Linus Torvalds
2018-02-11 7:28 ` Linus Torvalds
2018-02-11 10:34 ` Ulf Magnusson
2018-02-11 17:56 ` Kees Cook
2018-02-11 18:13 ` Linus Torvalds
2018-02-11 19:39 ` Kees Cook
2018-02-11 19:53 ` Linus Torvalds
2018-02-11 20:06 ` Linus Torvalds
2018-02-11 21:10 ` Arnd Bergmann
2018-02-11 21:19 ` Kees Cook
2018-02-11 21:50 ` Linus Torvalds
2018-02-12 10:44 ` Arnd Bergmann
2018-02-12 10:44 ` Arnd Bergmann
2018-02-11 22:29 ` Geert Uytterhoeven
2018-02-15 23:38 ` [RFC PATCH 4/7] kconfig: support new special property shell Palmer Dabbelt
2018-02-11 21:11 ` [RFC PATCH 4/7] kconfig: support new special property shell= Kees Cook
2018-02-11 19:42 ` Linus Torvalds [this message]
2018-02-12 8:26 ` Peter Zijlstra
2018-02-12 10:27 ` Thomas Gleixner
2018-02-12 11:52 ` Peter Zijlstra
2018-02-12 16:19 ` David Woodhouse
2018-02-12 16:19 ` David Woodhouse
2018-02-12 16:56 ` Kees Cook
2018-02-12 17:05 ` Peter Zijlstra
2018-02-12 17:33 ` Kees Cook
2018-02-12 17:36 ` David Woodhouse
2018-02-12 17:36 ` David Woodhouse
2018-02-12 17:37 ` Kees Cook
2018-02-12 17:00 ` Peter Zijlstra
2018-02-11 18:34 ` Ulf Magnusson
2018-02-11 21:05 ` Kees Cook
2018-02-11 21:35 ` Ulf Magnusson
2018-02-11 20:29 ` Ulf Magnusson
2018-02-11 20:42 ` Ulf Magnusson
2018-02-12 12:54 ` Ulf Magnusson
2018-02-12 14:21 ` Masahiro Yamada
2018-02-12 14:23 ` Masahiro Yamada
2018-02-12 14:32 ` Ulf Magnusson
2018-02-12 14:29 ` Ulf Magnusson
2018-02-12 14:53 ` Ulf Magnusson
2018-02-12 15:22 ` Masahiro Yamada
2018-02-12 15:35 ` Ulf Magnusson
2018-02-11 21:22 ` Ulf Magnusson
2018-02-12 14:39 ` Masahiro Yamada
2018-02-12 15:24 ` Kees Cook
2018-02-12 23:48 ` Randy Dunlap
2018-02-13 1:41 ` Masahiro Yamada
2018-02-13 1:53 ` Randy Dunlap
2018-02-13 8:35 ` Arnd Bergmann
2018-02-13 8:59 ` Masahiro Yamada
2018-02-12 10:44 ` Masahiro Yamada
2018-02-12 11:44 ` Ulf Magnusson
2018-02-12 11:49 ` Ulf Magnusson
2018-02-12 13:53 ` Masahiro Yamada
2018-02-12 14:13 ` Ulf Magnusson
2018-02-12 15:46 ` Kees Cook
2018-02-12 16:10 ` Masahiro Yamada
2018-02-13 8:55 ` Ulf Magnusson
2018-02-11 16:54 ` Kees Cook
2018-02-08 16:19 ` [RFC PATCH 5/7] kconfig: invoke silentoldconfig when compiler is updated Masahiro Yamada
2018-02-08 17:19 ` Masahiro Yamada
2018-02-08 17:45 ` Linus Torvalds
2018-02-08 16:19 ` [RFC PATCH 6/7] kconfig: add basic environments to evaluate C flags in Kconfig Masahiro Yamada
2018-02-08 16:19 ` [RFC PATCH 7/7] Test stackprotector options in Kconfig to kill CC_STACKPROTECTOR_AUTO Masahiro Yamada
2018-02-08 18:30 ` Kees Cook
2018-02-09 4:13 ` Masahiro Yamada
2018-02-08 16:43 ` [RFC PATCH 0/7] Kconfig: add new special property shell= to test compiler options in Kconfig Greg Kroah-Hartman
2018-02-08 17:19 ` Linus Torvalds
2018-02-08 17:39 ` Masahiro Yamada
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