linux-kernel - [PATCH] Use a zero-size array in the struct devres

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Message-ID: <20070306095241.28180.76390.stgit@localhost.localdomain>
Date:	Tue, 06 Mar 2007 09:54:37 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Tejun Heo <htejun@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] Use a zero-size array in the struct devres

Commit 9ac7849e35f705830f7b016ff272b0ff1f7ff759 adds the devres
structure containing a flexible unsigned long long array, with a
comment about the guaranteed alignment. According to the gcc manual,
flexible arrays are considered incomplete types and it is an error to
ask for their alignment. This patch makes data[] a zero-size array.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
---

I came across this when trying to build kmemleak as the modified
container_of macro tries to get the size of the devres.data member and
sizeof cannot be applied to incomplete types.

 drivers/base/devres.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/base/devres.c b/drivers/base/devres.c
index e177c95..0d6c067 100644
--- a/drivers/base/devres.c
+++ b/drivers/base/devres.c
@@ -22,7 +22,7 @@ struct devres_node {
 struct devres {
 	struct devres_node		node;
 	/* -- 3 pointers */
-	unsigned long long		data[];	/* guarantee ull alignment */
+	unsigned long long		data[0];	/* guarantee ull alignment */
 };

 struct devres_group {

-
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