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authorMiaohe Lin <linmiaohe@huawei.com>2022-04-28 23:16:14 -0700
committerakpm <akpm@linux-foundation.org>2022-04-28 23:16:14 -0700
commit3c9fe8b8f5e3e30bfa81eeeff4bc34c0fb67b739 (patch)
treef6a07150f94cb5db7b0128f0825d10c508459c16 /mm/mremap.c
parentf433195679a9639a3af5be03bcb9c3d933e3b261 (diff)
downloadlinux-3c9fe8b8f5e3e30bfa81eeeff4bc34c0fb67b739.tar.bz2
mm/mremap: avoid unneeded do_munmap call
When old_len == new_len, do_munmap will return -EINVAL due to len == 0. This errno will be simply ignored because of old_len != new_len check. So it is unnecessary to call do_munmap when old_len == new_len because nothing is actually done. Link: https://lkml.kernel.org/r/20220401081023.37080-1-linmiaohe@huawei.com Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Acked-by: David Hildenbrand <david@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mremap.c')
-rw-r--r--mm/mremap.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/mremap.c b/mm/mremap.c
index f2a53d53f1b9..98f50e633009 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -820,9 +820,9 @@ static unsigned long mremap_to(unsigned long addr, unsigned long old_len,
goto out;
}
- if (old_len >= new_len) {
+ if (old_len > new_len) {
ret = do_munmap(mm, addr+new_len, old_len - new_len, uf_unmap);
- if (ret && old_len != new_len)
+ if (ret)
goto out;
old_len = new_len;
}