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authorMiaohe Lin <linmiaohe@huawei.com>2021-06-30 18:50:42 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-06-30 20:47:29 -0700
commitf356aeacf7bbf32131de10d3e400b25b62e3eaaa (patch)
treed6577213bfb77d0b6fd272a634fdb5c80a99bad6
parent28473d91ff7f686d58047ff55f2fa98ab59114a4 (diff)
mm/zbud: reuse unbuddied[0] as buddied in zbud_pool
Patch series "Cleanups for zbud", v2. This series contains just cleanups to save some possible memory in zbud_pool and avoid exporting any unneeded zbud API. More details can be found in the respective changelogs This patch (of 2): 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. Link: https://lkml.kernel.org/r/20210608114515.206992-1-linmiaohe@huawei.com Link: https://lkml.kernel.org/r/20210608114515.206992-2-linmiaohe@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Cc: Seth Jennings <sjenning@redhat.com> Cc: Dan Streetman <ddstreet@ieee.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/zbud.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/zbud.c b/mm/zbud.c
index 7ec5f27a68b0..c48e60bae4a1 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -93,8 +93,14 @@
*/
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;