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. Link: https://lkml.kernel.org/r/20220504011345.662299-14-Liam.Howlett@xxxxxxxxxx Link: https://lkml.kernel.org/r/20220519150509.1290067-1-Liam.Howlett@xxxxxxxxxx Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: David Howells <dhowells@xxxxxxxxxx> Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> Cc: SeongJae Park <sj@xxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Will Deacon <will@xxxxxxxxxx> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/mmap.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index 19d2ddbb9a97..6ae0a8cf9956 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -3072,14 +3072,14 @@ 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_end < oldbrk) || - ((vma->vm_start == newbrk) && (vma->vm_end == oldbrk)))) { + if (likely((vma->vm_end < oldbrk) || (vma->vm_start >= newbrk))) { /* remove entire mapping(s) */ - ret = do_mas_munmap(mas, mm, newbrk, oldbrk-newbrk, uf, true); + ret = do_mas_align_munmap(mas, vma, mm, newbrk, oldbrk, uf, + true); goto munmap_full_vma; } -- 2.35.1
