linux-kernel - [PATCH v2] relay: fix percpu annotation in struct rchan

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Date:   Thu, 31 Jan 2019 03:23:04 +0100
From:   Luc Van Oostenryck <luc.vanoostenryck@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v2] relay: fix percpu annotation in struct rchan

The percpu member of this structure is declared as:
	struct ... ** __percpu member;
So its type is:
	__percpu pointer to pointer to struct ...

But looking at how it's used, its type should be:
	pointer to __percpu pointer to struct ...
and it should thus be declared as:
	struct ... * __percpu *member;

So fix the placement of '__percpu' in the definition of this
structures.

This silents a few Sparse's warnings like:
	warning: incorrect type in initializer (different address spaces)
	  expected void const [noderef] <asn:3> *__vpp_verify
	  got struct sched_domain **

CC: Jens Axboe <axboe@...nel.dk>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: linux-kernel@...r.kernel.org
Fixes: 017c59c042d0 ("relay: Use per CPU constructs for the relay channel buffer pointers")
Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@...il.com>

---
Changes since v1:
* use core.abbrev = auto for 'Fixes: 017c59c04...'
* remove bouncing email address

---
 include/linux/relay.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/relay.h b/include/linux/relay.h
index e1bdf01a86e2..c759f96e39c1 100644
--- a/include/linux/relay.h
+++ b/include/linux/relay.h
@@ -66,7 +66,7 @@ struct rchan
 	struct kref kref;		/* channel refcount */
 	void *private_data;		/* for user-defined data */
 	size_t last_toobig;		/* tried to log event > subbuf size */
-	struct rchan_buf ** __percpu buf; /* per-cpu channel buffers */
+	struct rchan_buf * __percpu *buf; /* per-cpu channel buffers */
 	int is_global;			/* One global buffer ? */
 	struct list_head list;		/* for channel list */
 	struct dentry *parent;		/* parent dentry passed to open */
-- 
2.20.0