OpenCloudOS-Kernel/arch/m68k/amiga
Gustavo A. R. Silva 366b8149fb m68k: amiga: config: 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 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Link: https://lore.kernel.org/r/20200420181401.GA32172@embeddedor
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
2020-04-27 11:51:08 +02:00
..
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
amiints.c genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
amisound.c treewide: Switch DEFINE_TIMER callbacks to struct timer_list * 2017-11-21 15:57:05 -08:00
chipram.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cia.c m68k: Call timer_interrupt() with interrupts disabled 2019-03-25 10:22:24 +01:00
config.c m68k: amiga: config: Replace zero-length array with flexible-array member 2020-04-27 11:51:08 +02:00
pcmcia.c m68k: kill arch/m68k/amiga/amiga_ksyms.c 2008-02-05 09:44:23 -08:00
platform.c zorro/UAPI: Use proper types (endianness/size) in <linux/zorro.h> 2013-11-26 11:09:09 +01:00