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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-03-19 16:21:53 -0500
committerMoritz Fischer <mdf@kernel.org>2020-04-29 20:37:12 -0700
commit5a53881580f90a5e4404954af16a5646ee9d7842 (patch)
tree64138feb83479528bc6239ef47e4350127149fbb /drivers/fpga
parentfd0d094531db812750bba0367a8822d10a43f444 (diff)
downloadlinux-5a53881580f90a5e4404954af16a5646ee9d7842.tar.bz2
fpga: dfl.h: 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: Moritz Fischer <mdf@kernel.org>
Diffstat (limited to 'drivers/fpga')
-rw-r--r--drivers/fpga/dfl.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 4a9a33cd9979..74784d3cfe7c 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -235,7 +235,7 @@ struct dfl_feature_platform_data {
int open_count;
void *private;
int num;
- struct dfl_feature features[0];
+ struct dfl_feature features[];
};
static inline