mm: zswap: use sg_set_folio() in zswap_{compress/decompress}()

Patch series "mm: zswap: trivial folio conversions".

Some trivial folio conversions in zswap code.


This patch (of 3):

sg_set_folio() is equivalent to sg_set_page() for order-0 folios, which
are the only ones supported by zswap. Now zswap_decompress() can take in
a folio directly.

Link: https://lkml.kernel.org/r/20240524033819.1953587-1-yosryahmed@google.com
Link: https://lkml.kernel.org/r/20240524033819.1953587-2-yosryahmed@google.comSigned-off-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Chengming Zhou <chengming.zhou@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/zswap.c

@@ -917,7 +917,7 @@ static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
 
 	dst = acomp_ctx->buffer;
 	sg_init_table(&input, 1);
-	sg_set_page(&input, &folio->page, PAGE_SIZE, 0);
+	sg_set_folio(&input, folio, PAGE_SIZE, 0);
 
 	/*
 	 * We need PAGE_SIZE * 2 here since there maybe over-compression case,
@@ -971,7 +971,7 @@ static bool zswap_compress(struct folio *folio, struct zswap_entry *entry)
 	return comp_ret == 0 && alloc_ret == 0;
 }
 
-static void zswap_decompress(struct zswap_entry *entry, struct page *page)
+static void zswap_decompress(struct zswap_entry *entry, struct folio *folio)
 {
 	struct zpool *zpool = zswap_find_zpool(entry);
 	struct scatterlist input, output;
@@ -1000,7 +1000,7 @@ static void zswap_decompress(struct zswap_entry *entry, struct page *page)
 
 	sg_init_one(&input, src, entry->length);
 	sg_init_table(&output, 1);
-	sg_set_page(&output, page, PAGE_SIZE, 0);
+	sg_set_folio(&output, folio, 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);
@@ -1073,7 +1073,7 @@ static int zswap_writeback_entry(struct zswap_entry *entry,
 		return -ENOMEM;
 	}
 
-	zswap_decompress(entry, &folio->page);
+	zswap_decompress(entry, folio);
 
 	count_vm_event(ZSWPWB);
 	if (entry->objcg)
@@ -1580,7 +1580,7 @@ bool zswap_load(struct folio *folio)
 		return false;
 
 	if (entry->length)
-		zswap_decompress(entry, page);
+		zswap_decompress(entry, folio);
 	else {
 		dst = kmap_local_page(page);
 		zswap_fill_page(dst, entry->value);