mm/fork: Pass new vma pointer into copy_page_range()

This prepares for the future work to trigger early cow on pinned pages
during fork().

No functional change intended.

Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 4861451..16b799a 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1646,7 +1646,7 @@ struct mmu_notifier_range;
 void free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
                unsigned long end, unsigned long floor, unsigned long ceiling);
 int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
-                       struct vm_area_struct *vma);
+                   struct vm_area_struct *vma, struct vm_area_struct *new);
 int follow_pte_pmd(struct mm_struct *mm, unsigned long address,
                   struct mmu_notifier_range *range,
                   pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp);

diff --git a/kernel/fork.c b/kernel/fork.c
index e65d819..da8d360 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -589,7 +589,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
 
                mm->map_count++;
                if (!(tmp->vm_flags & VM_WIPEONFORK))
-                       retval = copy_page_range(mm, oldmm, mpnt);
+                       retval = copy_page_range(mm, oldmm, mpnt, tmp);
 
                if (tmp->vm_ops && tmp->vm_ops->open)
                        tmp->vm_ops->open(tmp);

diff --git a/mm/memory.c b/mm/memory.c
index f3eb559..d561787 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -819,6 +819,7 @@ copy_present_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
 
 static int copy_pte_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                   pmd_t *dst_pmd, pmd_t *src_pmd, struct vm_area_struct *vma,
+                  struct vm_area_struct *new,
                   unsigned long addr, unsigned long end)
 {
        pte_t *orig_src_pte, *orig_dst_pte;
@@ -889,6 +890,7 @@ again:
 
 static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                pud_t *dst_pud, pud_t *src_pud, struct vm_area_struct *vma,
+               struct vm_area_struct *new,
                unsigned long addr, unsigned long end)
 {
        pmd_t *src_pmd, *dst_pmd;
@@ -915,7 +917,7 @@ static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src
                if (pmd_none_or_clear_bad(src_pmd))
                        continue;
                if (copy_pte_range(dst_mm, src_mm, dst_pmd, src_pmd,
-                                               vma, addr, next))
+                                  vma, new, addr, next))
                        return -ENOMEM;
        } while (dst_pmd++, src_pmd++, addr = next, addr != end);
        return 0;
@@ -923,6 +925,7 @@ static inline int copy_pmd_range(struct mm_struct *dst_mm, struct mm_struct *src
 
 static inline int copy_pud_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                p4d_t *dst_p4d, p4d_t *src_p4d, struct vm_area_struct *vma,
+               struct vm_area_struct *new,
                unsigned long addr, unsigned long end)
 {
        pud_t *src_pud, *dst_pud;
@@ -949,7 +952,7 @@ static inline int copy_pud_range(struct mm_struct *dst_mm, struct mm_struct *src
                if (pud_none_or_clear_bad(src_pud))
                        continue;
                if (copy_pmd_range(dst_mm, src_mm, dst_pud, src_pud,
-                                               vma, addr, next))
+                                  vma, new, addr, next))
                        return -ENOMEM;
        } while (dst_pud++, src_pud++, addr = next, addr != end);
        return 0;
@@ -957,6 +960,7 @@ static inline int copy_pud_range(struct mm_struct *dst_mm, struct mm_struct *src
 
 static inline int copy_p4d_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                pgd_t *dst_pgd, pgd_t *src_pgd, struct vm_area_struct *vma,
+               struct vm_area_struct *new,
                unsigned long addr, unsigned long end)
 {
        p4d_t *src_p4d, *dst_p4d;
@@ -971,14 +975,14 @@ static inline int copy_p4d_range(struct mm_struct *dst_mm, struct mm_struct *src
                if (p4d_none_or_clear_bad(src_p4d))
                        continue;
                if (copy_pud_range(dst_mm, src_mm, dst_p4d, src_p4d,
-                                               vma, addr, next))
+                                  vma, new, addr, next))
                        return -ENOMEM;
        } while (dst_p4d++, src_p4d++, addr = next, addr != end);
        return 0;
 }
 
 int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
-               struct vm_area_struct *vma)
+                   struct vm_area_struct *vma, struct vm_area_struct *new)
 {
        pgd_t *src_pgd, *dst_pgd;
        unsigned long next;
@@ -1033,7 +1037,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                if (pgd_none_or_clear_bad(src_pgd))
                        continue;
                if (unlikely(copy_p4d_range(dst_mm, src_mm, dst_pgd, src_pgd,
-                                           vma, addr, next))) {
+                                           vma, new, addr, next))) {
                        ret = -ENOMEM;
                        break;
                }