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Date:   Wed, 9 Nov 2022 15:24:43 +0900
From:   Sergey Senozhatsky <senozhatsky@chromium.org>
To:     Minchan Kim <minchan@kernel.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Sergey Senozhatsky <senozhatsky@chromium.org>,
        Nitin Gupta <ngupta@vflare.org>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
Subject: Re: [PATCHv4 6/9] zsmalloc: pass limit on pages per-zspage to
 zs_create_pool()
Message-ID: <Y2tHq6O9IA3g8Xt7@google.com>
References: <20221031054108.541190-1-senozhatsky@chromium.org>
 <20221031054108.541190-7-senozhatsky@chromium.org>
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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.