linux-kernel - [PATCH] mm/z3fold: Add __percpu annotation to *unbuddied pointer in struct z3fold

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Message-ID: <20240730123445.5875-1-ubizjak@gmail.com>
Date: Tue, 30 Jul 2024 14:34:17 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
	Vitaly Wool <vitaly.wool@...sulko.com>,
	Miaohe Lin <linmiaohe@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] 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.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: Vitaly Wool <vitaly.wool@...sulko.com>
Cc: Miaohe Lin <linmiaohe@...wei.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
---
 mm/z3fold.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/z3fold.c b/mm/z3fold.c
index 2ebfed32871b..379d24b4fef9 100644
--- a/mm/z3fold.c
+++ b/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;
-- 
2.45.2