linux-kernel - Re: [External] Re: [PATCH] mm: zswap: fix the lack of page lru flag in zswap_writeback

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Date: Tue, 16 Jan 2024 21:03:46 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Zhongkun He <hezhongkun.hzk@...edance.com>
Cc: Nhat Pham <nphamcs@...il.com>, Yosry Ahmed <yosryahmed@...gle.com>,
	akpm@...ux-foundation.org, hannes@...xchg.org, sjenning@...hat.com,
	ddstreet@...e.org, vitaly.wool@...sulko.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Chris Li <chrisl@...nel.org>
Subject: Re: [External] Re: [PATCH] mm: zswap: fix the lack of page lru flag
 in zswap_writeback_entry

On Tue, Jan 16, 2024 at 09:40:05PM +0800, Zhongkun He wrote:
> 2)  __read_swap_cache_async has six parameters, so there is no space to
> add a new one, add_to_lru_head.

That's easy enough.  Define a new set of flags, make one of them the
equivalent of skip_if_exists.  Something like:

typedef unsigned int __bitwise read_swap_t;

#define READ_SWAP_SKIP_EXISTING	((__force read_swap_t)0x00000001)
#define READ_SWAP_ADD_TAIL	((__force read_swap_t)0x00000002)

There's only six callers of __read_swap_cache_async() to convert, so not
really a big deal.