[PATCH] mm: exit_mmap need not reset

exit_mmap resets various mm_struct fields, but the mm is well on its way out,
and none of those fields matter by this point.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/mmap.c b/mm/mmap.c
index a3984fa..459b9f0 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1948,12 +1948,6 @@ void exit_mmap(struct mm_struct *mm)
        free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, 0);
        tlb_finish_mmu(tlb, 0, end);
 
-       mm->mmap = mm->mmap_cache = NULL;
-       mm->mm_rb = RB_ROOT;
-       set_mm_counter(mm, rss, 0);
-       mm->total_vm = 0;
-       mm->locked_vm = 0;
-
        spin_unlock(&mm->page_table_lock);
 
        /*