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 76497732932f ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 9315fbb87db37ff67413cf4c7ff0bc03f8c27fc4..fa8ad93029ad74abc294e8f1af244a150e43027b 100644 (file)
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -1043,7 +1043,7 @@ struct irq_chip_generic {
        unsigned long           unused;
        struct irq_domain       *domain;
        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 {
        unsigned int            irq_flags_to_clear;
        unsigned int            irq_flags_to_set;
        enum irq_gc_flags       gc_flags;
-       struct irq_chip_generic *gc[0];
+       struct irq_chip_generic *gc[];
 };
 
 /* Generic chip callback functions */