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From:   Kari Argillander <kari.argillander@stargateuniverse.net>
Date:   Tue, 22 Mar 2022 09:59:06 +0200
Message-ID: <CAKBF=pvWzuPx0JB3XZ-v+i7KGbhMQTgH6xtii_Bed+qKRFx+ww@mail.gmail.com>
Subject: Re: [TREE] "Fast Kernel Headers" Tree -v3
To:     Ingo Molnar <mingo@kernel.org>
Cc:     linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ard Biesheuvel <ardb@kernel.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Jonathan Corbet <corbet@lwn.net>, kari.argillander@gmail.com
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15.3.2022 12.35 Ingo Molnar (mingo@kernel.org) wrote:
>
> This is -v3 of the "Fast Kernel Headers" tree, which is an ongoing rework
> of the Linux kernel's header hierarchy & header dependencies, with the du=
al
> goals of:
>
>  - speeding up the kernel build (both absolute and incremental build time=
s)
>
>  - decoupling subsystem type & API definitions from each other
>
> The fast-headers tree consists of over 25 sub-trees internally, spanning
> over 2,300 commits, which can be found at:
>
>     git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master

I have had problems to build master branch (defconfig) with gcc9
    gcc (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0

I did also test v2 and problems where there too. I have no problem with gcc=
10 or
Clang11. Error I get is:

In file included from ./include/linux/rcuwait_api.h:7,
                 from ./include/linux/rcuwait.h:6,
                 from ./include/linux/irq_work.h:7,
                 from ./include/linux/perf_event_types.h:44,
                 from ./include/linux/perf_event_api.h:17,
                 from arch/x86/kernel/kprobes/opt.c:8:
./include/linux/rcuwait_api.h: In function =E2=80=98rcuwait_active=E2=80=99=
:
./include/linux/rcupdate.h:328:9: error: dereferencing pointer to
incomplete type =E2=80=98struct task_struct=E2=80=99
  328 |  typeof(*p) *local =3D (typeof(*p) *__force)READ_ONCE(p); \
      |         ^
./include/linux/rcupdate.h:439:31: note: in expansion of macro
=E2=80=98__rcu_access_pointer=E2=80=99
  439 | #define rcu_access_pointer(p) __rcu_access_pointer((p),
__UNIQUE_ID(rcu), __rcu)
      |                               ^~~~~~~~~~~~~~~~~~~~
./include/linux/rcuwait_api.h:15:11: note: in expansion of macro
=E2=80=98rcu_access_pointer=E2=80=99
   15 |  return !!rcu_access_pointer(w->task);

    Argillander

> There's various changes in -v3, and it's now ported to the latest kernel
> (v5.17-rc8).
>
> Diffstat difference:
>
>  -v2: 25332 files changed, 178498 insertions(+), 74790 deletions(-)
>  -v3: 25513 files changed, 180947 insertions(+), 74572 deletions(-)
>
> Thanks,
>
>         Ingo