Messages in this thread Patch in this message | | | Date | Tue, 11 Feb 2020 15:10:10 -0600 | From | "Gustavo A. R. Silva" <> | Subject | [PATCH] misc: vexpress: 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 inadvertenly introduced[3] to the codebase from now on.
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> --- drivers/misc/vexpress-syscfg.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/vexpress-syscfg.c b/drivers/misc/vexpress-syscfg.c index a3c6c773d9dc..5eb51f2be8f0 100644 --- a/drivers/misc/vexpress-syscfg.c +++ b/drivers/misc/vexpress-syscfg.c @@ -49,7 +49,7 @@ struct vexpress_syscfg_func { struct vexpress_syscfg *syscfg; struct regmap *regmap; int num_templates; - u32 template[0]; /* Keep it last! */ + u32 template[]; /* Keep it last! */ }; -- 2.25.0
| |