Commit 7856e9f1 authored by Gustavo A. R. Silva's avatar Gustavo A. R. Silva

irq.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 76497732 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: default avatarGustavo A. R. Silva <gustavo@embeddedor.com>
parent 1d9e13e8
...@@ -1043,7 +1043,7 @@ struct irq_chip_generic { ...@@ -1043,7 +1043,7 @@ struct irq_chip_generic {
unsigned long unused; unsigned long unused;
struct irq_domain *domain; struct irq_domain *domain;
struct list_head list; struct list_head list;
struct irq_chip_type chip_types[0]; struct irq_chip_type chip_types[];
}; };
/** /**
...@@ -1079,7 +1079,7 @@ struct irq_domain_chip_generic { ...@@ -1079,7 +1079,7 @@ struct irq_domain_chip_generic {
unsigned int irq_flags_to_clear; unsigned int irq_flags_to_clear;
unsigned int irq_flags_to_set; unsigned int irq_flags_to_set;
enum irq_gc_flags gc_flags; enum irq_gc_flags gc_flags;
struct irq_chip_generic *gc[0]; struct irq_chip_generic *gc[];
}; };
/* Generic chip callback functions */ /* Generic chip callback functions */
......
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