linux-kernel - Re: [PATCH v2 19/19] kasan: use stack_depot

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Message-ID: <CAG_fn=UZu3QpwTQYgXaYe8NVBsuqs8_Ado-+x4pJLaNE+Ph8Mw@mail.gmail.com>
Date:   Mon, 9 Oct 2023 14:24:21 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v2 19/19] kasan: use stack_depot_put for tag-based modes

On Wed, Sep 13, 2023 at 7:18 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Make tag-based KASAN modes to evict stack traces from the stack depot
"Make tag-based KASAN modes evict stack traces from the stack depot"
(without "to")

> Internally, pass STACK_DEPOT_FLAG_GET to stack_depot_save_flags (via
> kasan_save_stack) to increment the refcount when saving a new entry
> to stack ring and call stack_depot_put when removing an entry from
> stack ring.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>

(but see the two other comments)

> --- a/mm/kasan/report_tags.c
> +++ b/mm/kasan/report_tags.c
> @@ -7,6 +7,7 @@
>  #include <linux/atomic.h>
>
>  #include "kasan.h"
> +#include "../slab.h"

Why?