linux-kernel - Re: [PATCH 06/32] kasan: introduce kasan_print_aux

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Message-ID: <CANpmjNMTb4cxizfb5Xzy979jCA2_BMio6W4k1wZivKnu77RKVw@mail.gmail.com>
Date:   Fri, 17 Jun 2022 13:34:49 +0200
From:   Marco Elver <elver@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        kasan-dev@...glegroups.com, Peter Collingbourne <pcc@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Florian Mayer <fmayer@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH 06/32] kasan: introduce kasan_print_aux_stacks

On Mon, 13 Jun 2022 at 22:16, <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Add a kasan_print_aux_stacks() helper that prints the auxiliary stack
> traces for the Generic mode.
>
> This change hides references to alloc_meta from the common reporting code.
> This is desired as only the Generic mode will be using per-object metadata
> after this series.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> ---
>  mm/kasan/kasan.h          |  6 ++++++
>  mm/kasan/report.c         | 15 +--------------
>  mm/kasan/report_generic.c | 20 ++++++++++++++++++++
>  3 files changed, 27 insertions(+), 14 deletions(-)
>
> diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
> index aa6b43936f8d..bcea5ed15631 100644
> --- a/mm/kasan/kasan.h
> +++ b/mm/kasan/kasan.h
> @@ -265,6 +265,12 @@ void kasan_print_address_stack_frame(const void *addr);
>  static inline void kasan_print_address_stack_frame(const void *addr) { }
>  #endif
>
> +#ifdef CONFIG_KASAN_GENERIC
> +void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object);
> +#else
> +static inline void kasan_print_aux_stacks(struct kmem_cache *cache, const void *object) { }
> +#endif

Why not put this into one of the existing "#ifdef
CONFIG_KASAN_GENERIC" blocks? There are several; probably the one 10
lines down might be ok?