mm/util.c

   1 #include <linux/slab.h>
   2 #include <linux/string.h>
   3 #include <linux/module.h>
   4
   5 /**
   6  * kzalloc - allocate memory. The memory is set to zero.
   7  * @size: how many bytes of memory are required.
   8  * @flags: the type of memory to allocate.
   9  */
  10 void *kzalloc(size_t size, gfp_t flags)
  11 {
  12         void *ret = kmalloc(size, flags);
  13         if (ret)
  14                 memset(ret, 0, size);
  15         return ret;
  16 }
  17 EXPORT_SYMBOL(kzalloc);
  18
  19 /*
  20  * kstrdup - allocate space for and copy an existing string
  21  *
  22  * @s: the string to duplicate
  23  * @gfp: the GFP mask used in the kmalloc() call when allocating memory
  24  */
  25 char *kstrdup(const char *s, gfp_t gfp)
  26 {
  27         size_t len;
  28         char *buf;
  29
  30         if (!s)
  31                 return NULL;
  32
  33         len = strlen(s) + 1;
  34         buf = kmalloc(len, gfp);
  35         if (buf)
  36                 memcpy(buf, s, len);
  37         return buf;
  38 }
  39 EXPORT_SYMBOL(kstrdup);