mm: Move vma_stack_continue into mm.h

commit 39aa3cb3e8250db9188a6f1e3fb62ffa1a717678 upstream.

So it can be used by all that need to check for that.

Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 3544f60b8739a5b5a06206354dad09adc3ad3f4b..971fd7af54fac57667a46498815b03fff7cd7070 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -224,7 +224,8 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
        /* We don't show the stack guard page in /proc/maps */
        start = vma->vm_start;
        if (vma->vm_flags & VM_GROWSDOWN)
-               start += PAGE_SIZE;
+               if (!vma_stack_continue(vma->vm_prev, vma->vm_start))
+                       start += PAGE_SIZE;
 
        seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
                        start,

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 04fb7f65c8c519d2482cceb7c76b84a928cfd8b1..433d7e2e8504e70c55b9af5ce9e5936cb43e4ae2 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -859,6 +859,12 @@ int set_page_dirty(struct page *page);
 int set_page_dirty_lock(struct page *page);
 int clear_page_dirty_for_io(struct page *page);
 
+/* Is the vma a continuation of the stack vma above it? */
+static inline int vma_stack_continue(struct vm_area_struct *vma, unsigned long addr)
+{
+       return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
+}
+
 extern unsigned long move_page_tables(struct vm_area_struct *vma,
                unsigned long old_addr, struct vm_area_struct *new_vma,
                unsigned long new_addr, unsigned long len);

diff --git a/mm/mlock.c b/mm/mlock.c
index 5e57ebcd5717f75f44585d1c2b5a238e116d654a..6fe7001df48a90941b7ca12a0df0aeffabc7a6de 100644 (file)
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -135,12 +135,6 @@ void munlock_vma_page(struct page *page)
        }
 }
 
-/* Is the vma a continuation of the stack vma above it? */
-static inline int vma_stack_continue(struct vm_area_struct *vma, unsigned long addr)
-{
-       return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN);
-}
-
 static inline int stack_guard_page(struct vm_area_struct *vma, unsigned long addr)
 {
        return (vma->vm_flags & VM_GROWSDOWN) &&