linux-kernel - Re: [TREE] "Fast Kernel Headers" Tree -v3

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Date:   Tue, 22 Mar 2022 09:59:06 +0200
From:   Kari Argillander <kari.argillander@...rgateuniverse.net>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jonathan Corbet <corbet@....net>, kari.argillander@...il.com
Subject: Re: [TREE] "Fast Kernel Headers" Tree -v3

15.3.2022 12.35 Ingo Molnar (mingo@...nel.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 dual
> goals of:
>
>  - speeding up the kernel build (both absolute and incremental build times)
>
>  - 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 gcc10 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 ‘rcuwait_active’:
./include/linux/rcupdate.h:328:9: error: dereferencing pointer to
incomplete type ‘struct task_struct’
  328 |  typeof(*p) *local = (typeof(*p) *__force)READ_ONCE(p); \
      |         ^
./include/linux/rcupdate.h:439:31: note: in expansion of macro
‘__rcu_access_pointer’
  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
‘rcu_access_pointer’
   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