linux-kernel - [PATCH v8 30/70] mm/mmap: change do_brk_munmap() to use do_mas_align

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Message-ID: <20220426150616.3937571-31-Liam.Howlett@oracle.com>
Date:   Tue, 26 Apr 2022 15:06:38 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhao <yuzhao@...gle.com>
Subject: [PATCH v8 30/70] mm/mmap: change do_brk_munmap() to use
 do_mas_align_munmap()

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

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@...cle.com>
---
 mm/mmap.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 9f3a2192748b..a98f7c765628 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3009,14 +3009,15 @@ 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_end < oldbrk) ||
 		   ((vma->vm_start == newbrk) && (vma->vm_end == oldbrk)))) {
 		/* 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