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mm/z3fold: remove magic number in z3fold_create_pool()

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It's meaningless to pass a magic number 2 to __alloc_percpu() as there is
a minimum alignment size of PCPU_MIN_ALLOC_SIZE (> 2) in it.  Also there
is no special alignment requirement for unbuddied.  So we could replace
this magic number with nature alignment, i.e.  __alignof__(struct
list_head), to improve readability.

Link: https://lkml.kernel.org/r/20210619093151.1492174-4-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Hillf Danton <hdanton@sina.com>
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 18:50:30 -07:00 committed by Linus Torvalds
parent 014284a081
commit e891f60e28
1 changed files with 2 additions and 1 deletions
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3
mm/z3fold.c
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@ -998,7 +998,8 @@ static struct z3fold_pool *z3fold_create_pool(const char *name, gfp_t gfp,
goto out_c;
spin_lock_init(&pool->lock);
spin_lock_init(&pool->stale_lock);
pool->unbuddied = __alloc_percpu(sizeof(struct list_head)*NCHUNKS, 2);
pool->unbuddied = __alloc_percpu(sizeof(struct list_head) * NCHUNKS,
__alignof__(struct list_head));
if (!pool->unbuddied)
goto out_pool;
for_each_possible_cpu(cpu) {