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    Subject[PATCH 12/15] uprobes: simplify the usage of uprobe->pending_list
    uprobe->pending_list is only used to create the temporary list,
    it has no meaning after we drop uprobes_mmap_hash(inode).

    No need to initialize this node or remove it from tmp_list, and
    we can use list_for_each_entry().

    Signed-off-by: Oleg Nesterov <oleg@redhat.com>
    ---
    kernel/events/uprobes.c | 12 ++++--------
    1 files changed, 4 insertions(+), 8 deletions(-)

    diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
    index b9c61bd..7d5c78f 100644
    --- a/kernel/events/uprobes.c
    +++ b/kernel/events/uprobes.c
    @@ -513,7 +513,6 @@ static struct uprobe *alloc_uprobe(struct inode *inode, loff_t offset)
    uprobe->inode = igrab(inode);
    uprobe->offset = offset;
    init_rwsem(&uprobe->consumer_rwsem);
    - INIT_LIST_HEAD(&uprobe->pending_list);

    /* add to uprobes_tree, sorted on inode:offset */
    cur_uprobe = insert_uprobe(uprobe);
    @@ -1037,7 +1036,7 @@ static void build_probe_list(struct inode *inode, struct list_head *head)
    int uprobe_mmap(struct vm_area_struct *vma)
    {
    struct list_head tmp_list;
    - struct uprobe *uprobe, *u;
    + struct uprobe *uprobe;
    struct inode *inode;
    int ret, count;

    @@ -1055,10 +1054,9 @@ int uprobe_mmap(struct vm_area_struct *vma)
    ret = 0;
    count = 0;

    - list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) {
    + list_for_each_entry(uprobe, &tmp_list, pending_list) {
    loff_t vaddr;

    - list_del(&uprobe->pending_list);
    if (!ret) {
    vaddr = vma_address(vma, uprobe->offset);

    @@ -1106,7 +1104,7 @@ int uprobe_mmap(struct vm_area_struct *vma)
    void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned long end)
    {
    struct list_head tmp_list;
    - struct uprobe *uprobe, *u;
    + struct uprobe *uprobe;
    struct inode *inode;

    if (!atomic_read(&uprobe_events) || !valid_vma(vma, false))
    @@ -1123,12 +1121,10 @@ void uprobe_munmap(struct vm_area_struct *vma, unsigned long start, unsigned lon
    mutex_lock(uprobes_mmap_hash(inode));
    build_probe_list(inode, &tmp_list);

    - list_for_each_entry_safe(uprobe, u, &tmp_list, pending_list) {
    + list_for_each_entry(uprobe, &tmp_list, pending_list) {
    loff_t vaddr;

    - list_del(&uprobe->pending_list);
    vaddr = vma_address(vma, uprobe->offset);
    -
    if (vaddr >= start && vaddr < end) {
    /*
    * An unregister could have removed the probe before
    --
    1.5.5.1


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