// SPDX-License-Identifier: GPL-2.0-only
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/compiler.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/sched/signal.h>
#include <linux/sched/task_stack.h>
#include <linux/security.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/sysctl.h>
#include <linux/mman.h>
#include <linux/hugetlb.h>
#include <linux/vmalloc.h>
#include <linux/userfaultfd_k.h>
#include <linux/elf.h>
#include <linux/elf-randomize.h>
#include <linux/personality.h>
#include <linux/random.h>
#include <linux/processor.h>
#include <linux/sizes.h>
#include <linux/compat.h>
#include <linux/fsnotify.h>
#include <linux/page_idle.h>
#include <linux/uaccess.h>
#include <kunit/visibility.h>
#include "internal.h"
#include "swap.h"
/**
* kfree_const - conditionally free memory
* @x: pointer to the memory
*
* Function calls kfree only if @x is not in .rodata section.
*/
void kfree_const(const void *x)
{
if (!is_kernel_rodata((unsigned long)x))
kfree(x);
}
EXPORT_SYMBOL(kfree_const);
/**
* __kmemdup_nul - Create a NUL-terminated string from @s, which might be unterminated.
* @s: The data to copy
* @len: The size of the data, not including the NUL terminator
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
*
* Return: newly allocated copy of @s with NUL-termination or %NULL in
* case of error
*/
static __always_inline char *__kmemdup_nul(const char *s, size_t len, gfp_t gfp)
{
char *buf;
/* '+1' for the NUL terminator */
buf = kmalloc_track_caller(len + 1, gfp);
if (!buf)
return NULL;
memcpy(buf, s, len);
/* Ensure the buf is always NUL-terminated, regardless of @s. */
buf[len] = '\0';
return buf;
}
/**
* 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
*
* Return: newly allocated copy of @s or %NULL in case of error
*/
noinline
char *kstrdup(const char *s, gfp_t gfp)
{
return s ? __kmemdup_nul(s, strlen(s), gfp) : NULL;
}
EXPORT_SYMBOL(kstrdup);
/**
* kstrdup_const - conditionally d