Change the "enabled" parameter to be configurable at runtime. Remove
the enabled check from init(), and move it to the frontswap store()
function; when enabled, pages will be stored, and when disabled, pages
won't be stored.
Signed-off-by: Dan Streetman <ddstreet@xxxxxxxx>
---
mm/zswap.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/mm/zswap.c b/mm/zswap.c
index 4249e82..e070b10 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -75,9 +75,10 @@ static u64 zswap_duplicate_entry;
/*********************************
* tunables
**********************************/
-/* Enable/disable zswap (disabled by default, fixed at boot for now) */
-static bool zswap_enabled __read_mostly;
-module_param_named(enabled, zswap_enabled, bool, 0444);
+
+/* Enable/disable zswap (disabled by default) */
+static bool zswap_enabled;
+module_param_named(enabled, zswap_enabled, bool, 0644);
/* Compressor to be used by zswap (fixed at boot for now) */
#define ZSWAP_COMPRESSOR_DEFAULT "lzo"
@@ -648,6 +649,9 @@ static int zswap_frontswap_store(unsigned type, pgoff_t offset,
u8 *src, *dst;
struct zswap_header *zhdr;
+ if (!zswap_enabled)
+ return -EPERM;
+
if (!tree) {
ret = -ENODEV;
goto reject;
@@ -901,9 +905,6 @@ static int __init init_zswap(void)
{
gfp_t gfp = __GFP_NORETRY | __GFP_NOWARN;
- if (!zswap_enabled)
- return 0;
-
pr_info("loading zswap\n");
zswap_pool = zpool_create_pool(zswap_zpool_type, "zswap", gfp,
--
2.1.0
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