[lkml]   [2019]   [Apr]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[tip:irq/core] genirq/devres: Use struct_size() in devm_kzalloc()
Commit-ID:  2d65c42b43e53d61f1fd6b8d0a097451a4cffa24
Author: Gustavo A. R. Silva <>
AuthorDate: Wed, 10 Apr 2019 12:09:14 -0500
Committer: Thomas Gleixner <>
CommitDate: Tue, 16 Apr 2019 21:54:03 +0200

genirq/devres: Use struct_size() in devm_kzalloc()

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct foo {
int stuff;
struct boo entry[];

size = sizeof(struct foo) + count * sizeof(struct boo);
instance = devm_kzalloc(dev, size, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper.

instance = devm_kzalloc(dev, struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <>
Signed-off-by: Thomas Gleixner <>

kernel/irq/devres.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
index f808c6a97dcc..f6e5515ee077 100644
--- a/kernel/irq/devres.c
+++ b/kernel/irq/devres.c
@@ -220,9 +220,8 @@ devm_irq_alloc_generic_chip(struct device *dev, const char *name, int num_ct,
irq_flow_handler_t handler)
struct irq_chip_generic *gc;
- unsigned long sz = sizeof(*gc) + num_ct * sizeof(struct irq_chip_type);

- gc = devm_kzalloc(dev, sz, GFP_KERNEL);
+ gc = devm_kzalloc(dev, struct_size(gc, chip_types, num_ct), GFP_KERNEL);
if (gc)
irq_init_generic_chip(gc, name, num_ct,
irq_base, reg_base, handler);
 \ /
  Last update: 2019-04-16 21:58    [W:0.037 / U:1.304 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site