[Adeos-main] [PATCH 1/2] ipipe: Factor out ipipe_pin_vma

[Jan Kiszka]

Will be used for pinning during mprotect as well.

Signed-off-by: Jan Kiszka <jan.kis...@siemens.com>
---

This applies on core-3.2, but should be backported to maintained
versions as well (just leave out the "__").

 include/linux/ipipe.h |    1 +
 mm/memory.c           |   43 +++++++++++++++++++++++++------------------
 2 files changed, 26 insertions(+), 18 deletions(-)

diff --git a/include/linux/ipipe.h b/include/linux/ipipe.h
index 9f07346..29051c7 100644
--- a/include/linux/ipipe.h
+++ b/include/linux/ipipe.h
@@ -68,6 +68,7 @@ int __ipipe_migrate_head(void);
 void __ipipe_reenter_root(void);
 
 int __ipipe_disable_ondemand_mappings(struct task_struct *p);
+int __ipipe_pin_vma(struct mm_struct *mm, struct vm_area_struct *vma);
 
 #ifdef CONFIG_IPIPE_WANT_PREEMPTIBLE_SWITCH
 
diff --git a/mm/memory.c b/mm/memory.c
index ef04820..d251268 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -4092,13 +4092,31 @@ static inline int ipipe_pin_pud_range(struct mm_struct 
*mm, pgd_t *pgd,
        return 0;
 }
 
-int __ipipe_disable_ondemand_mappings(struct task_struct *tsk)
+int __ipipe_pin_vma(struct mm_struct *mm, struct vm_area_struct *vma)
 {
        unsigned long addr, next, end;
+       pgd_t *pgd;
+
+       addr = vma->vm_start;
+       end = vma->vm_end;
+
+       pgd = pgd_offset(mm, addr);
+       do {
+               next = pgd_addr_end(addr, end);
+               if (pgd_none_or_clear_bad(pgd))
+                       continue;
+               if (ipipe_pin_pud_range(mm, pgd, vma, addr, next))
+                       return -ENOMEM;
+       } while (pgd++, addr = next, addr != end);
+
+       return 0;
+}
+
+int __ipipe_disable_ondemand_mappings(struct task_struct *tsk)
+{
        struct vm_area_struct *vma;
        struct mm_struct *mm;
        int result = 0;
-       pgd_t *pgd;
 
        mm = get_task_mm(tsk);
        if (!mm)
@@ -4109,23 +4127,12 @@ int __ipipe_disable_ondemand_mappings(struct 
task_struct *tsk)
                goto done_mm;
 
        for (vma = mm->mmap; vma; vma = vma->vm_next) {
-               if (!is_cow_mapping(vma->vm_flags)
-                   || !(vma->vm_flags & VM_WRITE))
-                       continue;
-
-               addr = vma->vm_start;
-               end = vma->vm_end;
-
-               pgd = pgd_offset(mm, addr);
-               do {
-                       next = pgd_addr_end(addr, end);
-                       if (pgd_none_or_clear_bad(pgd))
-                               continue;
-                       if (ipipe_pin_pud_range(mm, pgd, vma, addr, next)) {
-                               result = -ENOMEM;
+               if (is_cow_mapping(vma->vm_flags) &&
+                   (vma->vm_flags & VM_WRITE)) {
+                       result = __ipipe_pin_vma(mm, vma);
+                       if (result < 0)
                                goto done_mm;
-                       }
-               } while (pgd++, addr = next, addr != end);
+               }
        }
        set_bit(MMF_VM_PINNED, &mm->flags);
 
-- 
1.7.3.4

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