linux-kernel - [PATCH] mm/zswap: export zswap API to modules

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Message-Id: <20250620193552.2772125-1-vitaly.wool@konsulko.se>
Date: Fri, 20 Jun 2025 21:35:52 +0200
From: Vitaly Wool <vitaly.wool@...sulko.se>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Vitaly Wool <vitaly.wool@...sulko.se>,
	Igor Belousov <igor.b@...dev.am>
Subject: [PATCH] mm/zswap: export zswap API to modules

There is no reason to not let modules use zswap capabilies to
densely store unused pages in RAM. This will allow to remove some
homebrew solutions for e.g. GPU drivers in favor of plainly using
zswap pool.

Signed-off-by: Vitaly Wool <vitaly.wool@...sulko.se>
Signed-off-by: Igor Belousov <igor.b@...dev.am>
---
 mm/zswap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mm/zswap.c b/mm/zswap.c
index 3c0fd8a13718..718d341f7482 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -502,6 +502,7 @@ unsigned long zswap_total_pages(void)
 
 	return total;
 }
+EXPORT_SYMBOL(zswap_total_pages);
 
 static bool zswap_check_limits(void)
 {
@@ -756,6 +757,7 @@ void zswap_folio_swapin(struct folio *folio)
 		atomic_long_inc(&lruvec->zswap_lruvec_state.nr_disk_swapins);
 	}
 }
+EXPORT_SYMBOL(zswap_folio_swapin);
 
 /*
  * This function should be called when a memcg is being offlined.
@@ -1638,6 +1640,7 @@ bool zswap_store(struct folio *folio)
 
 	return ret;
 }
+EXPORT_SYMBOL(zswap_store);
 
 /**
  * zswap_load() - load a folio from zswap
@@ -1718,6 +1721,7 @@ int zswap_load(struct folio *folio)
 	folio_unlock(folio);
 	return 0;
 }
+EXPORT_SYMBOL(zswap_load);
 
 void zswap_invalidate(swp_entry_t swp)
 {
@@ -1752,6 +1756,7 @@ int zswap_swapon(int type, unsigned long nr_pages)
 	zswap_trees[type] = trees;
 	return 0;
 }
+EXPORT_SYMBOL(zswap_swapon);
 
 void zswap_swapoff(int type)
 {
@@ -1769,6 +1774,7 @@ void zswap_swapoff(int type)
 	nr_zswap_trees[type] = 0;
 	zswap_trees[type] = NULL;
 }
+EXPORT_SYMBOL(zswap_swapoff);
 
 /*********************************
 * debugfs functions
-- 
2.39.2