[PATCH] introduce and use kzalloc

This patch introduces a kzalloc wrapper and converts kernel/ to use it.  It
saves a little program text.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

7 files changed, 27 insertions, 23 deletions

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 80b2dfde2e80..42a6bea58af3 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -99,7 +99,21 @@ found:
         return __kmalloc(size, flags);
 }
 
-extern void *kcalloc(size_t, size_t, unsigned int __nocast);
+extern void *kzalloc(size_t, unsigned int __nocast);
+
+/**
+ * kcalloc - allocate memory for an array. The memory is set to zero.
+ * @n: number of elements.
+ * @size: element size.
+ * @flags: the type of memory to allocate.
+ */
+static inline void *kcalloc(size_t n, size_t size, unsigned int __nocast flags)
+{
+        if (n != 0 && size > INT_MAX / n)
+                return NULL;
+        return kzalloc(n * size, flags);
+}
+
 extern void kfree(const void *);
 extern unsigned int ksize(const void *);
 
diff --git a/kernel/intermodule.c b/kernel/intermodule.c
index 388977f3e9b7..0cbe633420fb 100644
--- a/kernel/intermodule.c
+++ b/kernel/intermodule.c
@@ -39,7 +39,7 @@ void inter_module_register(const char *im_name, struct module *owner, const void
         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 *im_name, struct module *owner, const void
                 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;
diff --git a/kernel/params.c b/kernel/params.c
index d586c35ef8fc..fbf173215fd2 100644
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -542,8 +542,8 @@ static void __init kernel_param_sysfs_setup(const char *name,
 {
         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);
diff --git a/kernel/power/pm.c b/kernel/power/pm.c
index 61deda04e39e..159149321b3c 100644
--- a/kernel/power/pm.c
+++ b/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;
diff --git a/kernel/resource.c b/kernel/resource.c
index 26967e042201..92285d822de6 100644
--- a/kernel/resource.c
+++ b/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;
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index a3de837a8ddd..91bacb13a7e2 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -308,10 +308,9 @@ struct workqueue_struct *__create_workqueue(const char *name,
         struct workqueue_struct *wq;
         struct task_struct *p;
 
-        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. */
diff --git a/mm/slab.c b/mm/slab.c
index a9ff4f7f9860..d7c4443991fe 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2558,24 +2558,18 @@ void kmem_cache_free(kmem_cache_t *cachep, void *objp)
 EXPORT_SYMBOL(kmem_cache_free);
 
 /**
- * kcalloc - allocate memory for an array. The memory is set to zero.
- * @n: number of elements.
- * @size: element size.
+ * kzalloc - allocate memory. The memory is set to zero.
+ * @size: how many bytes of memory are required.
  * @flags: the type of memory to allocate.
  */
-void *kcalloc(size_t n, size_t size, unsigned int __nocast flags)
+void *kzalloc(size_t size, unsigned int __nocast flags)
 {
-        void *ret = NULL;
-
-        if (n != 0 && size > INT_MAX / n)
-                return ret;
-
-        ret = kmalloc(n * size, flags);
+        void *ret = kmalloc(size, flags);
         if (ret)
-                memset(ret, 0, n * size);
+                memset(ret, 0, size);
         return ret;
 }
-EXPORT_SYMBOL(kcalloc);
+EXPORT_SYMBOL(kzalloc);
 
 /**
  * kfree - free previously allocated memory