Linux-RDMA Archive on
 help / color / Atom feed
* [PATCH] IB/mthca: Replace zero-length array with flexible-array member
@ 2020-02-13  1:08 Gustavo A. R. Silva
  0 siblings, 0 replies; only message in thread
From: Gustavo A. R. Silva @ 2020-02-13  1:08 UTC (permalink / raw)
  To: Doug Ledford, Jason Gunthorpe
  Cc: linux-rdma, linux-kernel, Gustavo A. R. Silva

The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <>
 drivers/infiniband/hw/mthca/mthca_memfree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.c b/drivers/infiniband/hw/mthca/mthca_memfree.c
index 78a48aea3faf..dc10376f09cb 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.c
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.c
@@ -58,7 +58,7 @@ struct mthca_user_db_table {
 		u64                uvirt;
 		struct scatterlist mem;
 		int                refcount;
-	}                page[0];
+	} page[];
 static void mthca_free_icm_pages(struct mthca_dev *dev, struct mthca_icm_chunk *chunk)

^ permalink raw reply	[flat|nested] only message in thread

only message in thread, back to index

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-02-13  1:08 [PATCH] IB/mthca: Replace zero-length array with flexible-array member Gustavo A. R. Silva

Linux-RDMA Archive on

Archives are clonable:
	git clone --mirror linux-rdma/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-rdma linux-rdma/ \
	public-inbox-index linux-rdma

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone