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Date:   Fri, 26 Aug 2022 21:17:29 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Alexander Potapenko <glider@google.com>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Alexei Starovoitov <ast@kernel.org>,
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        Eric Dumazet <edumazet@google.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Ilya Leoshkevich <iii@linux.ibm.com>,
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        Pekka Enberg <penberg@kernel.org>,
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        Thomas Gleixner <tglx@linutronix.de>,
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        linux-mm@kvack.org, linux-arch@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 04/44] x86: asm: instrument usercopy in get_user()
 and put_user()
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On Fri, 26 Aug 2022 17:07:27 +0200 Alexander Potapenko <glider@google.com> wrote:

> Use hooks from instrumented.h to notify bug detection tools about
> usercopy events in variations of get_user() and put_user().

And this one blows up x86_64 allmodconfig builds.

> --- a/arch/x86/include/asm/uaccess.h
> +++ b/arch/x86/include/asm/uaccess.h
> @@ -5,6 +5,7 @@
>   * User space memory access functions
>   */
>  #include <linux/compiler.h>
> +#include <linux/instrumented.h>
>  #include <linux/kasan-checks.h>
>  #include <linux/string.h>
>  #include <asm/asm.h>

instrumented.h looks like a higher-level thing than uaccess.h, so this
inclusion is an inappropriate layering.  Or maybe not.

In file included from ./include/linux/kernel.h:22,
                 from ./arch/x86/include/asm/percpu.h:27,
                 from ./arch/x86/include/asm/nospec-branch.h:14,
                 from ./arch/x86/include/asm/paravirt_types.h:40,
                 from ./arch/x86/include/asm/ptrace.h:97,
                 from ./arch/x86/include/asm/math_emu.h:5,
                 from ./arch/x86/include/asm/processor.h:13,
                 from ./arch/x86/include/asm/timex.h:5,
                 from ./include/linux/timex.h:67,
                 from ./include/linux/time32.h:13,
                 from ./include/linux/time.h:60,
                 from ./include/linux/stat.h:19,
                 from ./include/linux/module.h:13,
                 from init/do_mounts.c:2:
./include/linux/page-flags.h: In function 'page_fixed_fake_head':
./include/linux/page-flags.h:226:36: error: invalid use of undefined type 'const struct page'
  226 |             test_bit(PG_head, &page->flags)) {
      |                                    ^~

[25000 lines snipped]


And kmsan-add-kmsan-runtime-core.patch introduces additional build
errors with x86_64 allmodconfig.

This is all with CONFIG_KMSAN=n

I'll disable the patch series.  Please do much more compilation testing
- multiple architectures, allnoconfig, allmodconfig, allyesconfig,
defconfig, randconfig, etc.  Good luck, it looks ugly :(