[irqchip: irq/irqchip-next] irqdomain: Use struct_size() helper when allocating irqdomain

[irqchip-bot for Marc Zyngier]

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     4242255a08578a7b1ac55df9f223d3b23af7d573
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/4242255a08578a7b1ac55df9f223d3b23af7d573
Author:        Marc Zyngier <maz@xxxxxxxxxx>
AuthorDate:    Mon, 05 Apr 2021 11:30:51 +01:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Wed, 02 Jun 2021 14:34:49 +01:00

irqdomain: Use struct_size() helper when allocating irqdomain

Instead of open-coding the size computation of struct irqdomain,
use the struct_size() helper instead.

This is going to be handy as we change the type of the revmap
array.

Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
 kernel/irq/irqdomain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index fa94c86..cdcb198 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -150,7 +150,7 @@ struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
 		    (!IS_ENABLED(CONFIG_IRQ_DOMAIN_NOMAP) && direct_max)))
 		return NULL;
 
-	domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size),
+	domain = kzalloc_node(struct_size(domain, revmap, size),
 			      GFP_KERNEL, of_node_to_nid(to_of_node(fwnode)));
 	if (!domain)
 		return NULL;