mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-03 17:14:14 +08:00
f490e8aea3
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
|
||
|---|---|---|
| .. | ||
| gru_instructions.h | ||
| gru.h | ||
| grufault.c | ||
| grufile.c | ||
| gruhandles.c | ||
| gruhandles.h | ||
| grukdump.c | ||
| grukservices.c | ||
| grukservices.h | ||
| grulib.h | ||
| grumain.c | ||
| gruprocfs.c | ||
| grutables.h | ||
| grutlbpurge.c | ||
| Makefile | ||