W16: Warning: Mode of file has changed

Help has this to say:

*W16*
Warning: Mode of file "{filename}" has changed since editing started

When the timestamp for a buffer was changed and the contents are still the
same but the mode (permissions) have changed. This usually occurs when
checking out a file from a version control system, which causes the read-only
bit to be reset. It should be safe to reload the file. Set 'autoread' to
automatically reload the file.

Is there a fix besides set autoread? In my usage, 100% of the time I get
this warning when I run a command like

:! chmod 755 %

I get that it is helpful to detect for some usecases, but I'd like this
to just be silenced and ignored all of the time. I'm hoping there is
some vim setting I don't know about which will take a list of
warnings to not warn about.

Elijah

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