summaryrefslogtreecommitdiff
path: root/include/net/pkt_sched.h
diff options
context:
space:
mode:
authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-27 23:58:44 +0300
committerDavid S. Miller <davem@davemloft.net>2020-03-01 08:27:02 +0300
commitb90feaff2a2cbf339069adec4bfd6091cfb44b50 (patch)
tree93bd8729ec50413d5a530bb7567abf4302de0fbd /include/net/pkt_sched.h
parent9f0ca0c1a50a7de5c71970aa452941199ed210d9 (diff)
downloadlinux-b90feaff2a2cbf339069adec4bfd6091cfb44b50.tar.xz
net: sched: Replace zero-length array with flexible-array member
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. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/pkt_sched.h')
-rw-r--r--include/net/pkt_sched.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/pkt_sched.h b/include/net/pkt_sched.h
index 6a70845bd9ab..20d2c6419612 100644
--- a/include/net/pkt_sched.h
+++ b/include/net/pkt_sched.h
@@ -181,7 +181,7 @@ struct tc_taprio_qopt_offload {
u64 cycle_time_extension;
size_t num_entries;
- struct tc_taprio_sched_entry entries[0];
+ struct tc_taprio_sched_entry entries[];
};
/* Reference counting */