mm/z3fold: add __percpu annotation to *unbuddied pointer in struct z3fold_pool

Compiling z3fold.c results in several sparse warnings:

z3fold.c:797:21: warning: incorrect type in initializer (different address spaces)
z3fold.c:797:21:    expected void const [noderef] __percpu *__vpp_verify
z3fold.c:797:21:    got struct list_head *
z3fold.c:852:37: warning: incorrect type in initializer (different address spaces)
z3fold.c:852:37:    expected void const [noderef] __percpu *__vpp_verify
z3fold.c:852:37:    got struct list_head *
z3fold.c:924:25: warning: incorrect type in assignment (different address spaces)
z3fold.c:924:25:    expected struct list_head *unbuddied
z3fold.c:924:25:    got void [noderef] __percpu *_res
z3fold.c:930:33: warning: incorrect type in initializer (different address spaces)
z3fold.c:930:33:    expected void const [noderef] __percpu *__vpp_verify
z3fold.c:930:33:    got struct list_head *
z3fold.c:949:25: warning: incorrect type in argument 1 (different address spaces)
z3fold.c:949:25:    expected void [noderef] __percpu *__pdata
z3fold.c:949:25:    got struct list_head *unbuddied
z3fold.c:979:25: warning: incorrect type in argument 1 (different address spaces)
z3fold.c:979:25:    expected void [noderef] __percpu *__pdata
z3fold.c:979:25:    got struct list_head *unbuddied

Add __percpu annotation to *unbuddied pointer to fix these warnings.

Link: https://lkml.kernel.org/r/20240730123445.5875-1-ubizjak@gmail.comSigned-off-by: Uros Bizjak <ubizjak@gmail.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/z3fold.c

@@ -144,7 +144,7 @@ struct z3fold_pool {
 	const char *name;
 	spinlock_t lock;
 	spinlock_t stale_lock;
-	struct list_head *unbuddied;
+	struct list_head __percpu *unbuddied;
 	struct list_head stale;
 	atomic64_t pages_nr;
 	struct kmem_cache *c_handle;