[tip: irq/core] irqchip/qcom-irq-combiner: Replace zero-length array with flexible-array member

[tip-bot2 for Gustavo A. R. Silva]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     33ad1e5db06c94126352f785e9f0a08e867cb94c
Gitweb:        https://git.kernel.org/tip/33ad1e5db06c94126352f785e9f0a08e867cb94c
Author:        Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
AuthorDate:    Thu, 19 Mar 2020 16:45:31 -05:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Sun, 22 Mar 2020 11:52:52 

irqchip/qcom-irq-combiner: 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@xxxxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200319214531.GA21326@xxxxxxxxxxxxxx
---
 drivers/irqchip/qcom-irq-combiner.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/qcom-irq-combiner.c b/drivers/irqchip/qcom-irq-combiner.c
index abfe592..aa54bfc 100644
--- a/drivers/irqchip/qcom-irq-combiner.c
+++ b/drivers/irqchip/qcom-irq-combiner.c
@@ -33,7 +33,7 @@ struct combiner {
 	int                 parent_irq;
 	u32                 nirqs;
 	u32                 nregs;
-	struct combiner_reg regs[0];
+	struct combiner_reg regs[];
 };
 
 static inline int irq_nr(u32 reg, u32 bit)