我在Git中创建了一个新分支：

git branch my_branch

推动它：

git push origin my_branch

现在假设有人在服务器上做了一些更改，我想从origin/my_branch中提取。我愿意：

git pull

但我得到：

You asked me to pull without telling me which branch you
want to merge with, and 'branch.my_branch.merge' in
your configuration file does not tell me, either. Please
specify which branch you want to use on the command line and
try again (e.g. 'git pull <repository> <refspec>').
See git-pull(1) for details.

If you often merge with the same branch, you may want to
use something like the following in your configuration file:

    [branch "my_branch"]
    remote = <nickname>
    merge = <remote-ref>

    [remote "<nickname>"]
    url = <url>
    fetch = <refspec>

See git-config(1) for details.

我了解到，我可以通过以下方式实现：

git branch --set-upstream my_branch origin/my_branch

但为什么我需要为我创建的每个分支都这样做？如果我将my_branch推到origin/my_branch，那么我会想将origin/mi_branch拉到my_brance，这不是很明显吗？如何将此设置为默认行为？