linux-kernel - Re: [PATCHv4 6/9] zsmalloc: pass limit on pages per-zspage to zs_create

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Message-ID: <Y2tHq6O9IA3g8Xt7@google.com>
Date:   Wed, 9 Nov 2022 15:24:43 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCHv4 6/9] zsmalloc: pass limit on pages per-zspage to
 zs_create_pool()

On (22/10/31 14:41), Sergey Senozhatsky wrote:
[..]
> -struct zs_pool *zs_create_pool(const char *name)
> +struct zs_pool *zs_create_pool(const char *name, unsigned long num_pages)
>  {
>  	int i;
>  	struct zs_pool *pool;
>  	struct size_class *prev_class = NULL;
> -	unsigned long num_pages;
> +
> +	if (WARN_ON(num_pages < ZS_MIN_PAGES_PER_ZSPAGE ||
> +		    num_pages > ZS_MAX_PAGES_PER_ZSPAGE))
> +		return NULL;

I tend to think that creating `struct zs_tunables` would be better. For
the time being zs_tunables will contain only one member max_zspage_len,
but it can be extended in the future.