From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
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@xxxxxxxxxx>
---
mm/mmap.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 14190306a483..79b8494d83c6 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2926,12 +2926,15 @@ 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)
+ ret = do_mas_align_munmap(mas, vma, mm, newbrk, oldbrk, uf,
+ true);
goto munmap_full_vma;
}
--
2.30.2
