#include <asm/futex.h>
#include "uaccess.h"
+static inline pte_t *follow_table(struct mm_struct *mm, unsigned long addr)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd = pgd_offset(mm, addr);
+ if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
+ return NULL;
+
+ pud = pud_offset(pgd, addr);
+ if (pud_none(*pud) || unlikely(pud_bad(*pud)))
+ return NULL;
+
+ pmd = pmd_offset(pud, addr);
+ if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
+ return NULL;
+
+ return pte_offset_map(pmd, addr);
+}
+
static int __handle_fault(struct mm_struct *mm, unsigned long address,
int write_access)
{
struct vm_area_struct *vma;
int ret = -EFAULT;
+ int fault;
if (in_atomic())
return ret;
}
survive:
- switch (handle_mm_fault(mm, vma, address, write_access)) {
- case VM_FAULT_MINOR:
- current->min_flt++;
- break;
- case VM_FAULT_MAJOR:
- current->maj_flt++;
- break;
- case VM_FAULT_SIGBUS:
- goto out_sigbus;
- case VM_FAULT_OOM:
- goto out_of_memory;
- default:
+ fault = handle_mm_fault(mm, vma, address, write_access);
+ if (unlikely(fault & VM_FAULT_ERROR)) {
+ if (fault & VM_FAULT_OOM)
+ goto out_of_memory;
+ else if (fault & VM_FAULT_SIGBUS)
+ goto out_sigbus;
BUG();
}
+ if (fault & VM_FAULT_MAJOR)
+ current->maj_flt++;
+ else
+ current->min_flt++;
ret = 0;
out:
up_read(&mm->mmap_sem);
out_of_memory:
up_read(&mm->mmap_sem);
- if (is_init(current)) {
+ if (is_global_init(current)) {
yield();
down_read(&mm->mmap_sem);
goto survive;
{
struct mm_struct *mm = current->mm;
unsigned long offset, pfn, done, size;
- pgd_t *pgd;
- pmd_t *pmd;
pte_t *pte;
void *from, *to;
retry:
spin_lock(&mm->page_table_lock);
do {
- pgd = pgd_offset(mm, uaddr);
- if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
- goto fault;
-
- pmd = pmd_offset(pgd, uaddr);
- if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
- goto fault;
-
- pte = pte_offset_map(pmd, uaddr);
+ pte = follow_table(mm, uaddr);
if (!pte || !pte_present(*pte) ||
(write_user && !pte_write(*pte)))
goto fault;
{
struct mm_struct *mm = current->mm;
unsigned long pfn, ret;
- pgd_t *pgd;
- pmd_t *pmd;
pte_t *pte;
int rc;
ret = 0;
retry:
- pgd = pgd_offset(mm, uaddr);
- if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
- goto fault;
-
- pmd = pmd_offset(pgd, uaddr);
- if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
- goto fault;
-
- pte = pte_offset_map(pmd, uaddr);
+ pte = follow_table(mm, uaddr);
if (!pte || !pte_present(*pte))
goto fault;
unsigned long uaddr = (unsigned long) src;
struct mm_struct *mm = current->mm;
unsigned long offset, pfn, done, len;
- pgd_t *pgd;
- pmd_t *pmd;
pte_t *pte;
size_t len_str;
retry:
spin_lock(&mm->page_table_lock);
do {
- pgd = pgd_offset(mm, uaddr);
- if (pgd_none(*pgd) || unlikely(pgd_bad(*pgd)))
- goto fault;
-
- pmd = pmd_offset(pgd, uaddr);
- if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd)))
- goto fault;
-
- pte = pte_offset_map(pmd, uaddr);
+ pte = follow_table(mm, uaddr);
if (!pte || !pte_present(*pte))
goto fault;
uaddr, done, size;
unsigned long uaddr_from = (unsigned long) from;
unsigned long uaddr_to = (unsigned long) to;
- pgd_t *pgd_from, *pgd_to;
- pmd_t *pmd_from, *pmd_to;
pte_t *pte_from, *pte_to;
int write_user;
retry:
spin_lock(&mm->page_table_lock);
do {
- pgd_from = pgd_offset(mm, uaddr_from);
- if (pgd_none(*pgd_from) || unlikely(pgd_bad(*pgd_from))) {
- uaddr = uaddr_from;
- write_user = 0;
- goto fault;
- }
- pgd_to = pgd_offset(mm, uaddr_to);
- if (pgd_none(*pgd_to) || unlikely(pgd_bad(*pgd_to))) {
- uaddr = uaddr_to;
- write_user = 1;
- goto fault;
- }
-
- pmd_from = pmd_offset(pgd_from, uaddr_from);
- if (pmd_none(*pmd_from) || unlikely(pmd_bad(*pmd_from))) {
- uaddr = uaddr_from;
- write_user = 0;
- goto fault;
- }
- pmd_to = pmd_offset(pgd_to, uaddr_to);
- if (pmd_none(*pmd_to) || unlikely(pmd_bad(*pmd_to))) {
- uaddr = uaddr_to;
- write_user = 1;
- goto fault;
- }
-
- pte_from = pte_offset_map(pmd_from, uaddr_from);
+ pte_from = follow_table(mm, uaddr_from);
if (!pte_from || !pte_present(*pte_from)) {
uaddr = uaddr_from;
write_user = 0;
goto fault;
}
- pte_to = pte_offset_map(pmd_to, uaddr_to);
+
+ pte_to = follow_table(mm, uaddr_to);
if (!pte_to || !pte_present(*pte_to) || !pte_write(*pte_to)) {
uaddr = uaddr_to;
write_user = 1;