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From:   Andrey Konovalov <andreyknvl@gmail.com>
Date:   Mon, 5 Jul 2021 16:41:16 +0200
Message-ID: <CA+fCnZc4XrsCbh1ZXwFShmaZ41_4Sj9LywZAq1fYju2V_t0HQw@mail.gmail.com>
Subject: Re: [PATCH] kasan: fix build by including kernel.h
To:     Marco Elver <elver@google.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Alexander Potapenko <glider@google.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Peter Collingbourne <pcc@google.com>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
        kasan-dev <kasan-dev@googlegroups.com>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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On Mon, Jul 5, 2021 at 9:27 AM Marco Elver <elver@google.com> wrote:
>
> The <linux/kasan.h> header relies on _RET_IP_ being defined, and had
> been receiving that definition via inclusion of bug.h which includes
> kernel.h. However, since f39650de687e that is no longer the case and get
> the following build error when building CONFIG_KASAN_HW_TAGS on arm64:
>
>   In file included from arch/arm64/mm/kasan_init.c:10:
>   ./include/linux/kasan.h: In function 'kasan_slab_free':
>   ./include/linux/kasan.h:230:39: error: '_RET_IP_' undeclared (first use in this function)
>     230 |   return __kasan_slab_free(s, object, _RET_IP_, init);
>
> Fix it by including kernel.h from kasan.h.
>
> Fixes: f39650de687e ("kernel.h: split out panic and oops helpers")
> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Marco Elver <elver@google.com>
> ---
>  include/linux/kasan.h | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/include/linux/kasan.h b/include/linux/kasan.h
> index 5310e217bd74..dd874a1ee862 100644
> --- a/include/linux/kasan.h
> +++ b/include/linux/kasan.h
> @@ -3,6 +3,7 @@
>  #define _LINUX_KASAN_H
>
>  #include <linux/bug.h>
> +#include <linux/kernel.h>
>  #include <linux/static_key.h>
>  #include <linux/types.h>
>
> --
> 2.32.0.93.g670b81a890-goog
>

Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>