mm: arch: make get_gate_vma take an mm_struct instead of a task_struct

Morally, the presence of a gate vma is more an attribute of a particular mm than
a particular task.  Moreover, dropping the dependency on task_struct will help
make both existing and future operations on mm's more flexible and convenient.

Signed-off-by: Stephen Wilson <wilsons@start.ca>
Reviewed-by: Michel Lespinasse <walken@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

2 files changed, 4 insertions, 4 deletions

diff --git a/mm/memory.c b/mm/memory.c
index e48945ab362b..b6dc37097433 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1488,7 +1488,7 @@ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
                 vma = find_extend_vma(mm, start);
                 if (!vma && in_gate_area(tsk, start)) {
                         unsigned long pg = start & PAGE_MASK;
-                        struct vm_area_struct *gate_vma = get_gate_vma(tsk);
+                        struct vm_area_struct *gate_vma = get_gate_vma(tsk->mm);
                         pgd_t *pgd;
                         pud_t *pud;
                         pmd_t *pmd;
@@ -3496,7 +3496,7 @@ static int __init gate_vma_init(void)
 __initcall(gate_vma_init);
 #endif
 
-struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
+struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
 {
 #ifdef AT_SYSINFO_EHDR
         return &gate_vma;
diff --git a/mm/mlock.c b/mm/mlock.c
index c3924c7f00be..2689a08c79af 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -237,7 +237,7 @@ long mlock_vma_pages_range(struct vm_area_struct *vma,
 
         if (!((vma->vm_flags & (VM_DONTEXPAND | VM_RESERVED)) ||
                         is_vm_hugetlb_page(vma) ||
-                        vma == get_gate_vma(current))) {
+                        vma == get_gate_vma(current->mm))) {
 
                 __mlock_vma_pages_range(vma, start, end, NULL);
 
@@ -332,7 +332,7 @@ static int mlock_fixup(struct vm_area_struct *vma, struct vm_area_struct **prev,
         int lock = newflags & VM_LOCKED;
 
         if (newflags == vma->vm_flags || (vma->vm_flags & VM_SPECIAL) ||
-            is_vm_hugetlb_page(vma) || vma == get_gate_vma(current))
+            is_vm_hugetlb_page(vma) || vma == get_gate_vma(current->mm))
                 goto out;       /* don't set VM_LOCKED,  don't count */
 
         pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT);