From: Masahiro Yamada <masahiroy@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
linux-hardening@vger.kernel.org,
Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Justin Forbes <jforbes@redhat.com>,
Ondrej Mosnacek <omosnace@redhat.com>,
Frank Eigler <fche@redhat.com>, Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT modules
Date: Sat, 6 Mar 2021 00:31:36 +0900 [thread overview]
Message-ID: <CAK7LNARDEwyjDj3u=8Y176TehU9FD548LFTrqi3AmBR6jrnA_Q@mail.gmail.com> (raw)
In-Reply-To: <CAHk-=wiT3FGuKuqLniBN2T_PZwD0GH4kf3XNCzq2tfChqn0+SQ@mail.gmail.com>
On Fri, Mar 5, 2021 at 4:13 AM Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> On Thu, Mar 4, 2021 at 7:36 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
> >
> > All the kernel-space objects are rebuilt
> > when the compiler is upgraded.
>
> I very much NAK'ed that one. Why did that go in?
When the compiler is upgraded, all objects
should be rebuilt by the new compiler,
- this keeps Kbuild deterministic,
irrespective of whether it is a fresh build,
or incremental build.
If we do not force the full rebuild,
the banner at boot time is no point.
[ 0.000000] Linux version 5.8.0-44-generic (buildd@lgw01-amd64-039)
(gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0, GNU ld (GNU Binutils for
Ubuntu) 2.35.1) #50-Ubuntu SMP Tue Feb 9 06:29:41 UTC 2021 (Ubuntu
5.8.0-44.50-generic 5.8.18)
It claims it was built by
gcc (Ubuntu 10.2.0-13ubuntu1) 10.2.0
but we would never know if it is true
for whole objects.
Some of them might have been compiled by
an older compiler.
> Or maybe I NAK'ed another version of it (I think the one I NAK'ed was
> from Josh), and didn't realize that there were multiple ones.
>
> > Linus complaint about GCC plugins not being rebuilt.
>
> Yes, and that was a separate complaint and not at all tied to the other objects.
>
> Gcc plugins aren't kernel object files at all. They are very much like
> dynamically loadable libraries to gcc itself.
>
> Linus
--
Best Regards
Masahiro Yamada
next prev parent reply other threads:[~2021-03-05 15:33 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-25 20:42 [PATCH RFC] gcc-plugins: Handle GCC version mismatch for OOT modules Josh Poimboeuf
2021-01-25 21:16 ` Masahiro Yamada
2021-01-25 21:27 ` Josh Poimboeuf
2021-01-25 21:44 ` Masahiro Yamada
2021-01-25 22:07 ` Josh Poimboeuf
2021-01-26 8:13 ` Greg KH
2021-01-26 12:44 ` Justin Forbes
2021-01-26 13:51 ` Greg KH
2021-01-26 14:51 ` Josh Poimboeuf
2021-01-26 15:00 ` Greg KH
2021-01-26 15:15 ` Peter Zijlstra
2021-01-26 15:46 ` Josh Poimboeuf
2021-01-26 16:05 ` Peter Zijlstra
2021-01-26 16:15 ` Justin Forbes
2021-01-26 16:19 ` Josh Poimboeuf
2021-01-26 17:06 ` Greg KH
2021-01-26 17:47 ` Justin Forbes
2021-01-26 16:22 ` David Laight
2021-01-27 18:03 ` Christoph Hellwig
2021-01-26 8:12 ` Greg KH
2021-01-25 22:03 ` Kees Cook
2021-01-25 22:19 ` Josh Poimboeuf
2021-01-26 17:56 ` Kees Cook
2021-01-26 18:43 ` Josh Poimboeuf
2021-01-26 22:59 ` Kees Cook
2021-01-26 23:32 ` Josh Poimboeuf
2021-01-26 1:53 ` Masahiro Yamada
2021-01-26 12:16 ` David Laight
2021-01-27 18:02 ` Christoph Hellwig
2021-01-27 18:38 ` Josh Poimboeuf
2021-01-27 18:43 ` Christoph Hellwig
2021-01-27 18:51 ` Josh Poimboeuf
2021-01-27 22:09 ` David Laight
2021-01-28 14:29 ` Christoph Hellwig
2021-01-28 15:45 ` Josh Poimboeuf
2021-03-02 23:26 ` Josh Poimboeuf
2021-03-03 18:49 ` Masahiro Yamada
2021-03-03 19:15 ` Josh Poimboeuf
2021-03-03 19:25 ` Linus Torvalds
2021-03-03 19:38 ` Josh Poimboeuf
2021-03-03 19:57 ` Linus Torvalds
2021-03-03 20:24 ` Josh Poimboeuf
2021-03-03 20:31 ` Josh Poimboeuf
2021-03-03 20:56 ` Linus Torvalds
2021-03-03 21:45 ` Josh Poimboeuf
2021-03-04 12:27 ` Masahiro Yamada
2021-03-04 15:08 ` Josh Poimboeuf
2021-03-04 15:35 ` Masahiro Yamada
2021-03-04 19:12 ` Linus Torvalds
2021-03-05 2:41 ` Josh Poimboeuf
2021-03-05 2:49 ` Linus Torvalds
2021-03-05 16:03 ` Masahiro Yamada
2021-03-05 19:18 ` Josh Poimboeuf
2021-03-08 9:39 ` David Laight
2021-03-05 15:31 ` Masahiro Yamada [this message]
2021-03-03 21:52 ` Kees Cook
2021-03-04 12:26 ` Masahiro Yamada
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