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mm/zbud: reuse unbuddied[0] as buddied in zbud_pool

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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 9d8c5b5284 ("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>
This commit is contained in:
Miaohe Lin 2021-06-30 18:50:42 -07:00 committed by Linus Torvalds
parent 28473d91ff
commit f356aeacf7
1 changed files with 8 additions and 2 deletions
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10
mm/zbud.c
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@ -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;