linux - Contrib clone of linux

Age	Commit message (Expand)	Author
2012-05-31	kernel/cpu_pm.c: fix various typos	Nicolas Pitre
2011-09-23	cpu_pm: call notifiers during suspend	Colin Cross
2011-09-23	cpu_pm: Add cpu power management notifiers	Colin Cross

#include <linux/mm.h> #include <linux/slab.h> #include <linux/string.h> #include <linux/module.h> #include <linux/err.h> #include <linux/sched.h> #include <asm/uaccess.h> /** * kstrdup - allocate space for and copy an existing string * @s: the string to duplicate * @gfp: the GFP mask used in the kmalloc() call when allocating memory */ char *kstrdup(const char *s, gfp_t gfp) { size_t len; char *buf; if (!s) return NULL; len = strlen(s) + 1; buf = kmalloc_track_caller(len, gfp); if (buf) memcpy(buf, s, len); return buf; } EXPORT_SYMBOL(kstrdup); /** * kstrndup - allocate space for and copy an existing string * @s: the string to duplicate * @max: read at most @max chars from @s * @gfp: the GFP mask used in the kmalloc() call when allocating memory */ char *kstrndup(const char *s, size_t max, gfp_t gfp) { size_t len; char *buf; if (!s) return NULL; len = strnlen(s, max); buf = kmalloc_track_caller(len+1, gfp); if (buf) { memcpy(buf, s, len); buf[len] = '\0'; } return buf; } EXPORT_SYMBOL(kstrndup); /** * kmemdup - duplicate region of memory * * @src: memory region to duplicate * @len: memory region length * @gfp: GFP mask to use */ void *kmemdup(const void *src, size_t len, gfp_t gfp) { void *p; p = kmalloc_track_caller(len, gfp); if (p) memcpy(p, src, len); return p; } EXPORT_SYMBOL(kmemdup); /** * __krealloc - like krealloc() but don't free @p. * @p: object to reallocate memory for. * @new_size: how many bytes of memory are required. * @flags: the type of memory to allocate. * * This function is like krealloc() except it never frees the originally * allocated buffer. Use this if you don't want to free the buffer immediately * like, for example, with RCU. */ void *__krealloc(const void *p, size_t new_size, gfp_t flags) { void *ret; size_t ks = 0; if (unlikely(!new_size)) return ZERO_SIZE_PTR; if (p) ks = ksize(p); if (ks >= new_size) return (void *)p; ret = kmalloc_track_caller(new_size, flags); if (ret && p) memcpy(ret, p, ks); return ret; } EXPORT_SYMBOL(__krealloc); /** * krealloc - reallocate memory. The contents will remain unchanged. * @p: object to reallocate memory for. * @new_size: how many bytes of memory are required. * @flags: the type of memory to allocate. * * The contents of the object pointed to are preserved up to the * lesser of the new and old sizes. If @p is %NULL, krealloc() * behaves exactly like kmalloc(). If @size is 0 and @p is not a * %NULL pointer, the object pointed to is freed. */ void *krealloc(const void *p, size_t new_size, gfp_t flags) { void *ret; if (unlikely(!new_size)) { kfree(p); return ZERO_SIZE_PTR; } ret = __krealloc(p, new_size, flags); if (ret && p != ret) kfree(p); return ret; } EXPORT_SYMBOL(krealloc); /* * strndup_user - duplicate an existing string from user space * @s: The string to duplicate * @n: Maximum number of bytes to copy, including the trailing NUL. */ char *strndup_user(const char __user *s, long n) { char *p; long length; length = strnlen_user(s, n); if (!length) return ERR_PTR(-EFAULT); if (length > n) return ERR_PTR(-EINVAL); p = kmalloc(length, GFP_KERNEL); if (!p) return ERR_PTR(-ENOMEM); if (copy_from_user(p, s, length)) { kfree(p); return ERR_PTR(-EFAULT); } p[length - 1] = '\0'; return p; } EXPORT_SYMBOL(strndup_user); #ifndef HAVE_ARCH_PICK_MMAP_LAYOUT void arch_pick_mmap_layout(struct mm_struct *mm) { mm->mmap_base = TASK_UNMAPPED_BASE; mm->get_unmapped_area = arch_get_unmapped_area; mm->unmap_area = arch_unmap_area; } #endif int __attribute__((weak)) get_user_pages_fast(unsigned long start, int nr_pages, int write, struct page **pages) { struct mm_struct *mm = current->mm; int ret; down_read(&mm->mmap_sem); ret = get_user_pages(current, mm, start, nr_pages, write, 0, pages, NULL); up_read(&mm->mmap_sem); return ret; } EXPORT_SYMBOL_GPL(get_user_pages_fast);