linux-kernel - Re: [PATCH 04/15] stackdepot: add depot_fetch

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Message-ID: <CAG_fn=XJ-fZTJPqrjcu2PVNzBvg8309M+jT4h_iGraYNN4APmA@mail.gmail.com>
Date:   Wed, 30 Aug 2023 09:47:10 +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>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH 04/15] stackdepot: add depot_fetch_stack helper

On Tue, Aug 29, 2023 at 7:11 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Add a helper depot_fetch_stack function that fetches the pointer to
> a stack record.
>
> With this change, all static depot_* functions now operate on stack pools
> and the exported stack_depot_* functions operate on the hash table.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>

(one nit below)


> +static struct stack_record *depot_fetch_stack(depot_stack_handle_t handle)
> +{
> +       union handle_parts parts = { .handle = handle };
> +       /*
> +        * READ_ONCE pairs with potential concurrent write in
> +        * depot_alloc_stack.
Nit: please change to "depot_alloc_stack()" for consistency with the
rest of the comments.