linux-kernel - Re: [PATCH] mm: zswap: fix zswap_never_enabled() for CONFIG

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Date: Mon, 1 Jul 2024 23:52:10 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Barry Song <21cnbao@...il.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Barry Song
 <v-songbaohua@...o.com>, Yosry Ahmed <yosryahmed@...gle.com>, Nhat Pham
 <nphamcs@...il.com>, Chengming Zhou <chengming.zhou@...ux.dev>, Chris Li
 <chrisl@...nel.org>, David Hildenbrand <david@...hat.com>, Johannes Weiner
 <hannes@...xchg.org>, Matthew Wilcox <willy@...radead.org>
Subject: Re: [PATCH] mm: zswap: fix zswap_never_enabled() for
 CONFIG_ZSWAP==N

On Sun, 30 Jun 2024 11:22:31 +1200 Barry Song <21cnbao@...il.com> wrote:

> From: Barry Song <v-songbaohua@...o.com>
> 
> If CONFIG_ZSWAP is set to N, it means zswap cannot be enabled.
> zswap_never_enabled() should return true.
> 
> ...
>
> --- a/include/linux/zswap.h
> +++ b/include/linux/zswap.h
> @@ -68,7 +68,7 @@ static inline bool zswap_is_enabled(void)
>  
>  static inline bool zswap_never_enabled(void)
>  {
> -	return false;
> +	return true;
>  }

Well, that code was as wrong as it's possible to get.

But what effect does this have?  Seems "not much"?  Perhaps we'll
attempt a zswap_load() which later fails for other reasons?