linux-kernel - [PATCH] workqueue: Correct declaration of cpu_pwq in struct workqueue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240805073037.60238-1-ubizjak@gmail.com>
Date: Mon,  5 Aug 2024 09:30:29 +0200
From: Uros Bizjak <ubizjak@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Uros Bizjak <ubizjak@...il.com>,
	Tejun Heo <tj@...nel.org>,
	Lai Jiangshan <jiangshanlai@...il.com>
Subject: [PATCH] workqueue: Correct declaration of cpu_pwq in struct workqueue_struct

cpu_pwq is used in various percpu functions that expect variable in
__percpu address space. Correct the declaration of cpu_pwq to

struct pool_workqueue __rcu * __percpu *cpu_pwq

to declare the variable as __percpu pointer.

The patch also fixes following sparse errors:

workqueue.c:380:37: warning: duplicate [noderef]
workqueue.c:380:37: error: multiple address spaces given: __rcu & __percpu
workqueue.c:2271:15: error: incompatible types in comparison expression (different address spaces):
workqueue.c:2271:15:    struct pool_workqueue [noderef] __rcu *
workqueue.c:2271:15:    struct pool_workqueue [noderef] __percpu *

and uncovers a couple of exisiting "incorrect type in assignment"
warnings (from __rcu address space), which this patch does not address.

Found by GCC's named address space checks.

There were no changes in the resulting object files.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>
---
 kernel/workqueue.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 1745ca788ede..32729a2e93af 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -377,7 +377,7 @@ struct workqueue_struct {
 
 	/* hot fields used during command issue, aligned to cacheline */
 	unsigned int		flags ____cacheline_aligned; /* WQ: WQ_* flags */
-	struct pool_workqueue __percpu __rcu **cpu_pwq; /* I: per-cpu pwqs */
+	struct pool_workqueue __rcu * __percpu *cpu_pwq; /* I: per-cpu pwqs */
 	struct wq_node_nr_active *node_nr_active[]; /* I: per-node nr_active */
 };
 
-- 
2.45.2