Hi Andrew,
Pekka Enberg <[email protected]> wrote:
> > This patch converts kernel/ to use kcalloc instead of kmalloc/memset.
On Thu, 4 Aug 2005, Andrew Morton wrote:
> grr.
I am learning grep. Please don't eat me!
> > - struct resource *res = kmalloc(sizeof(*res), GFP_KERNEL);
> > + struct resource *res = kcalloc(1, sizeof(*res), GFP_KERNEL);
>
> Notice how every conversion you did passes in `1' in the first argument?
>
> And that's going to happen again and again and again. Each callsite
> needlessly passing that silly third argument, adding more kernel text.
>
> If we're going to do this, we should add a two-arg helper function first,
> and use that, no?
This was discussed some time ago [1] and here's a patch for you to do
that.
Pekka
1. http://marc.theaimsgroup.com/?l=linux-kernel&m=111279001428661&w=2
[PATCH] use kzalloc instead of kmalloc/memset
This patch introduces a kzalloc wrapper and converts kernel/ to use it.
Signed-off-by: Pekka Enberg <[email protected]>
---
include/linux/slab.h | 5 +++++
kernel/intermodule.c | 3 +--
kernel/params.c | 4 ++--
kernel/power/pm.c | 3 +--
kernel/resource.c | 3 +--
kernel/workqueue.c | 3 +--
6 files changed, 11 insertions(+), 10 deletions(-)
Index: 2.6/kernel/resource.c
===================================================================
--- 2.6.orig/kernel/resource.c
+++ 2.6/kernel/resource.c
@@ -430,10 +430,9 @@ EXPORT_SYMBOL(adjust_resource);
*/
struct resource * __request_region(struct resource *parent, unsigned long start, unsigned long n, const char *name)
{
- struct resource *res = kmalloc(sizeof(*res), GFP_KERNEL);
+ struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL);
if (res) {
- memset(res, 0, sizeof(*res));
res->name = name;
res->start = start;
res->end = start + n - 1;
Index: 2.6/kernel/intermodule.c
===================================================================
--- 2.6.orig/kernel/intermodule.c
+++ 2.6/kernel/intermodule.c
@@ -39,7 +39,7 @@ void inter_module_register(const char *i
struct list_head *tmp;
struct inter_module_entry *ime, *ime_new;
- if (!(ime_new = kmalloc(sizeof(*ime), GFP_KERNEL))) {
+ if (!(ime_new = kzalloc(sizeof(*ime), GFP_KERNEL))) {
/* Overloaded kernel, not fatal */
printk(KERN_ERR
"Aiee, inter_module_register: cannot kmalloc entry for '%s'\n",
@@ -47,7 +47,6 @@ void inter_module_register(const char *i
kmalloc_failed = 1;
return;
}
- memset(ime_new, 0, sizeof(*ime_new));
ime_new->im_name = im_name;
ime_new->owner = owner;
ime_new->userdata = userdata;
Index: 2.6/kernel/params.c
===================================================================
--- 2.6.orig/kernel/params.c
+++ 2.6/kernel/params.c
@@ -542,8 +542,8 @@ static void __init kernel_param_sysfs_se
{
struct module_kobject *mk;
- mk = kmalloc(sizeof(struct module_kobject), GFP_KERNEL);
- memset(mk, 0, sizeof(struct module_kobject));
+ mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL);
+ BUG_ON(!mk);
mk->mod = THIS_MODULE;
kobj_set_kset_s(mk, module_subsys);
Index: 2.6/kernel/power/pm.c
===================================================================
--- 2.6.orig/kernel/power/pm.c
+++ 2.6/kernel/power/pm.c
@@ -60,9 +60,8 @@ struct pm_dev *pm_register(pm_dev_t type
unsigned long id,
pm_callback callback)
{
- struct pm_dev *dev = kmalloc(sizeof(struct pm_dev), GFP_KERNEL);
+ struct pm_dev *dev = kzalloc(sizeof(struct pm_dev), GFP_KERNEL);
if (dev) {
- memset(dev, 0, sizeof(*dev));
dev->type = type;
dev->id = id;
dev->callback = callback;
Index: 2.6/kernel/workqueue.c
===================================================================
--- 2.6.orig/kernel/workqueue.c
+++ 2.6/kernel/workqueue.c
@@ -310,10 +310,9 @@ struct workqueue_struct *__create_workqu
BUG_ON(strlen(name) > 10);
- wq = kmalloc(sizeof(*wq), GFP_KERNEL);
+ wq = kzalloc(sizeof(*wq), GFP_KERNEL);
if (!wq)
return NULL;
- memset(wq, 0, sizeof(*wq));
wq->name = name;
/* We don't need the distraction of CPUs appearing and vanishing. */
Index: 2.6/include/linux/slab.h
===================================================================
--- 2.6.orig/include/linux/slab.h
+++ 2.6/include/linux/slab.h
@@ -103,6 +103,11 @@ extern void *kcalloc(size_t, size_t, uns
extern void kfree(const void *);
extern unsigned int ksize(const void *);
+static inline void *kzalloc(size_t size, unsigned int __nocast flags)
+{
+ return kcalloc(1, size, flags);
+}
+
#ifdef CONFIG_NUMA
extern void *kmem_cache_alloc_node(kmem_cache_t *, int flags, int node);
extern void *kmalloc_node(size_t size, unsigned int __nocast flags, int node);
-
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