mm/mmap: Change do_brk_munmap() to use do_mas_align_munmap()

do_brk_munmap() has already aligned the address and has a maple tree
state to be used.  Use the new do_mas_align_munmap() to avoid
unnecessary alignment and error checks.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/mm/mmap.c b/mm/mmap.c
index 8788630b7cc18199acba30ae0f4e6cfc51a9a878..39e79ca8ec704ad08decd96ee4169b11563e2e01 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3018,12 +3018,16 @@ static int do_brk_munmap(struct ma_state *mas, struct vm_area_struct *vma,
        struct mm_struct *mm = vma->vm_mm;
        struct vm_area_struct unmap;
        unsigned long unmap_pages;
-       int ret = 1;
+       int ret;
 
        arch_unmap(mm, newbrk, oldbrk);
 
-       if (likely(vma->vm_start >= newbrk)) { // remove entire mapping(s)
-               ret = do_mas_munmap(mas, mm, newbrk, oldbrk-newbrk, uf, true);
+       if (likely((vma->vm_end < oldbrk) ||
+                  ((vma->vm_start == newbrk) && (vma->vm_end == oldbrk)))) {
+               // remove entire mapping(s)
+               mas->last = oldbrk - 1;
+               ret = do_mas_align_munmap(mas, vma, mm, newbrk, oldbrk, uf,
+                                         true);
                goto munmap_full_vma;
        }