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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - mm/util.c
1 #include <linux/slab.h>
2 #include <linux/string.h>
3 #include <linux/module.h>
5 #include <asm/uaccess.h>
8 * __kzalloc - allocate memory. The memory is set to zero.
9 * @size: how many bytes of memory are required.
10 * @flags: the type of memory to allocate.
12 void *__kzalloc(size_t size
, gfp_t flags
)
14 void *ret
= kmalloc_track_caller(size
, flags
);
19 EXPORT_SYMBOL(__kzalloc
);
22 * kstrdup - allocate space for and copy an existing string
24 * @s: the string to duplicate
25 * @gfp: the GFP mask used in the kmalloc() call when allocating memory
27 char *kstrdup(const char *s
, gfp_t gfp
)
36 buf
= kmalloc_track_caller(len
, gfp
);
41 EXPORT_SYMBOL(kstrdup
);
44 * kmemdup - duplicate region of memory
46 * @src: memory region to duplicate
47 * @len: memory region length
48 * @gfp: GFP mask to use
50 void *kmemdup(const void *src
, size_t len
, gfp_t gfp
)
54 p
= kmalloc_track_caller(len
, gfp
);
59 EXPORT_SYMBOL(kmemdup
);
62 * strndup_user - duplicate an existing string from user space
64 * @s: The string to duplicate
65 * @n: Maximum number of bytes to copy, including the trailing NUL.
67 char *strndup_user(const char __user
*s
, long n
)
72 length
= strnlen_user(s
, n
);
75 return ERR_PTR(-EFAULT
);
78 return ERR_PTR(-EINVAL
);
80 p
= kmalloc(length
, GFP_KERNEL
);
83 return ERR_PTR(-ENOMEM
);
85 if (copy_from_user(p
, s
, length
)) {
87 return ERR_PTR(-EFAULT
);
94 EXPORT_SYMBOL(strndup_user
);