linux-kernel - [RFC 2/4] mm/zswap: modify zswap_decompress to accept page instead of folio

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Message-ID: <20241018105026.2521366-3-usamaarif642@gmail.com>
Date: Fri, 18 Oct 2024 11:48:40 +0100
From: Usama Arif <usamaarif642@...il.com>
To: akpm@...ux-foundation.org,
	linux-mm@...ck.org
Cc: hannes@...xchg.org,
	david@...hat.com,
	willy@...radead.org,
	kanchana.p.sridhar@...el.com,
	yosryahmed@...gle.com,
	nphamcs@...il.com,
	chengming.zhou@...ux.dev,
	ryan.roberts@....com,
	ying.huang@...el.com,
	21cnbao@...il.com,
	riel@...riel.com,
	shakeel.butt@...ux.dev,
	kernel-team@...a.com,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Usama Arif <usamaarif642@...il.com>
Subject: [RFC 2/4] mm/zswap: modify zswap_decompress to accept page instead of folio

This is a prerequisite for zswap_load to be able to decompress
large folios. zswap_load will iterate through each page in a folio
and decompress into it.

Signed-off-by: Usama Arif <usamaarif642@...il.com>
---
 mm/zswap.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/zswap.c b/mm/zswap.c
index f4b03071b2fb..9cc91ae31116 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -953,7 +953,7 @@ static bool zswap_compress(struct page *page, struct zswap_entry *entry,
 	return comp_ret == 0 && alloc_ret == 0;
 }
 
-static void zswap_decompress(struct zswap_entry *entry, struct folio *folio)
+static void zswap_decompress(struct zswap_entry *entry, struct page *page)
 {
 	struct zpool *zpool = entry->pool->zpool;
 	struct scatterlist input, output;
@@ -982,7 +982,7 @@ static void zswap_decompress(struct zswap_entry *entry, struct folio *folio)
 
 	sg_init_one(&input, src, entry->length);
 	sg_init_table(&output, 1);
-	sg_set_folio(&output, folio, PAGE_SIZE, 0);
+	sg_set_page(&output, page, PAGE_SIZE, 0);
 	acomp_request_set_params(acomp_ctx->req, &input, &output, entry->length, PAGE_SIZE);
 	BUG_ON(crypto_wait_req(crypto_acomp_decompress(acomp_ctx->req), &acomp_ctx->wait));
 	BUG_ON(acomp_ctx->req->dlen != PAGE_SIZE);
@@ -1055,7 +1055,7 @@ static int zswap_writeback_entry(struct zswap_entry *entry,
 		return -ENOMEM;
 	}
 
-	zswap_decompress(entry, folio);
+	zswap_decompress(entry, &folio->page);
 
 	count_vm_event(ZSWPWB);
 	if (entry->objcg)
@@ -1666,7 +1666,7 @@ bool zswap_load(struct folio *folio)
 	if (!entry)
 		return false;
 
-	zswap_decompress(entry, folio);
+	zswap_decompress(entry, &folio->page);
 
 	count_vm_event(ZSWPIN);
 	if (entry->objcg)
-- 
2.43.5