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-rw-r--r--mm/zswap.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/mm/zswap.c b/mm/zswap.c
index cdf6950fcb2e..3efd8cae315e 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -120,11 +120,19 @@ static unsigned int zswap_accept_thr_percent = 90; /* of max pool size */
module_param_named(accept_threshold_percent, zswap_accept_thr_percent,
uint, 0644);
-/* Enable/disable handling same-value filled pages (enabled by default) */
+/*
+ * Enable/disable handling same-value filled pages (enabled by default).
+ * If disabled every page is considered non-same-value filled.
+ */
static bool zswap_same_filled_pages_enabled = true;
module_param_named(same_filled_pages_enabled, zswap_same_filled_pages_enabled,
bool, 0644);
+/* Enable/disable handling non-same-value filled pages (enabled by default) */
+static bool zswap_non_same_filled_pages_enabled = true;
+module_param_named(non_same_filled_pages_enabled, zswap_non_same_filled_pages_enabled,
+ bool, 0644);
+
/*********************************
* data structures
**********************************/
@@ -1147,6 +1155,11 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
kunmap_atomic(src);
}
+ if (!zswap_non_same_filled_pages_enabled) {
+ ret = -EINVAL;
+ goto freepage;
+ }
+
/* if entry is successfully added, it keeps the reference */
entry->pool = zswap_pool_current_get();
if (!entry->pool) {