From: Zhou Guanghui <zhouguanghui1@huawei.com> Offering: HULK hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5PIA2 -------------------------------- When a process is added to a group, mm->mm_users increases by one. When a process is deleted from a group, mm->mm_users decreases by one. It is not possible to reduce to 0 because this function is preceded by get_task_mm. Signed-off-by: Zhou Guanghui <zhouguanghui1@huawei.com> --- mm/share_pool.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/mm/share_pool.c b/mm/share_pool.c index 23756fe9cbfc..0f87eb6782c3 100644 --- a/mm/share_pool.c +++ b/mm/share_pool.c @@ -1623,11 +1623,7 @@ int mg_sp_group_del_task(int pid, int spg_id) list_del(&spg_node->group_node); mm->sp_group_master->count--; kfree(spg_node); - if (atomic_sub_and_test(1, &mm->mm_users)) { - up_write(&sp_group_sem); - WARN(1, "Invalid user counting\n"); - return -EINVAL; - } + atomic_dec(&mm->mm_users); up_write(&sp_group_sem); -- 2.20.1