+#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>
/**
- * __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 *__kzalloc(size_t size, gfp_t flags)
-{
- void *ret = kmalloc_track_caller(size, flags);
- if (ret)
- memset(ret, 0, size);
- return ret;
-}
-EXPORT_SYMBOL(__kzalloc);
-
-/*
* 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
*/
}
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
*
}
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.
void *krealloc(const void *p, size_t new_size, gfp_t flags)
{
void *ret;
- size_t ks;
if (unlikely(!new_size)) {
kfree(p);
return ZERO_SIZE_PTR;
}
- ks = ksize(p);
- if (ks >= new_size)
- return (void *)p;
-
- ret = kmalloc_track_caller(new_size, flags);
- if (ret) {
- memcpy(ret, p, min(new_size, ks));
+ 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.
*/
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);