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Subject[PATCH v2 1/2] mm/zbud: reuse unbuddied[0] as buddied in zbud_pool
Date
Since commit 9d8c5b5284e4 ("mm: zbud: fix condition check on allocation
size"), zbud_pool.unbuddied[0] is always unused. We can reuse it as buddied
field to save some possible memory.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
mm/zbud.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/mm/zbud.c b/mm/zbud.c
index a200121da400..78e80ca58869 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -95,8 +95,14 @@
*/
struct zbud_pool {
spinlock_t lock;
- struct list_head unbuddied[NCHUNKS];
- struct list_head buddied;
+ union {
+ /*
+ * Reuse unbuddied[0] as buddied on the ground that
+ * unbuddied[0] is unused.
+ */
+ struct list_head buddied;
+ struct list_head unbuddied[NCHUNKS];
+ };
struct list_head lru;
u64 pages_nr;
const struct zbud_ops *ops;
--
2.23.0
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