linux-kernel - [PATCH v9 2/7] mm: zswap: Modify zswap_compress() to accept a page instead of a folio.

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Message-Id: <20240930221221.6981-3-kanchana.p.sridhar@intel.com>
Date: Mon, 30 Sep 2024 15:12:16 -0700
From: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	hannes@...xchg.org,
	yosryahmed@...gle.com,
	nphamcs@...il.com,
	chengming.zhou@...ux.dev,
	usamaarif642@...il.com,
	shakeel.butt@...ux.dev,
	ryan.roberts@....com,
	ying.huang@...el.com,
	21cnbao@...il.com,
	akpm@...ux-foundation.org,
	willy@...radead.org
Cc: nanhai.zou@...el.com,
	wajdi.k.feghali@...el.com,
	vinodh.gopal@...el.com,
	kanchana.p.sridhar@...el.com
Subject: [PATCH v9 2/7] mm: zswap: Modify zswap_compress() to accept a page instead of a folio.

For zswap_store() to be able to store a large folio by compressing it
one page at a time, zswap_compress() needs to accept a page as input.
This will allow us to iterate through each page in the folio in
zswap_store(), compress it and store it in the zpool.

Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
Reviewed-by: Nhat Pham <nphamcs@...il.com>
Reviewed-by: Chengming Zhou <chengming.zhou@...ux.dev>
Acked-by: Johannes Weiner <hannes@...xchg.org>
---
 mm/zswap.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index efad4e941e44..fd7a8c14457a 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -875,7 +875,7 @@ static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
 	return 0;
 }
 
-static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
+static bool zswap_compress(struct page *page, struct zswap_entry *entry)
 {
 	struct crypto_acomp_ctx *acomp_ctx;
 	struct scatterlist input, output;
@@ -893,7 +893,7 @@ static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
 
 	dst = acomp_ctx->buffer;
 	sg_init_table(&input, 1);
-	sg_set_folio(&input, folio, PAGE_SIZE, 0);
+	sg_set_page(&input, page, PAGE_SIZE, 0);
 
 	/*
 	 * We need PAGE_SIZE * 2 here since there maybe over-compression case,
@@ -1456,7 +1456,7 @@ bool zswap_store(struct folio *folio)
 		mem_cgroup_put(memcg);
 	}
 
-	if (!zswap_compress(folio, entry))
+	if (!zswap_compress(&folio->page, entry))
 		goto put_pool;
 
 	entry->swpentry = swp;
-- 
2.27.0