linux-kernel - Re: [PATCH] kasan: fix build by including kernel.h

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Message-ID: <CAHp75VeRosmsAdCD7W7o9upb+G-de-rwhjCnPtTra2FToEmytg@mail.gmail.com>
Date:   Mon, 5 Jul 2021 11:49:58 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Marco Elver <elver@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, pcc@...gle.com,
        Catalin Marinas <catalin.marinas@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH] kasan: fix build by including kernel.h

On Mon, Jul 5, 2021 at 10:28 AM Marco Elver <elver@...gle.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.

...which I would like to avoid in the long term, but for now it's
probably the best quick fix, otherwise it will require the real split
of _RET_IP or at least rethinking its location.

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.org>
Thanks!

> Fixes: f39650de687e ("kernel.h: split out panic and oops helpers")

P.S. I have tested the initial patch against full build of x86_64, and
it was long time available for different CIs/build bots, none
complained so far.

> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Signed-off-by: Marco Elver <elver@...gle.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
>


-- 
With Best Regards,
Andy Shevchenko