filetypes and global variables

I'm using the Vim Airline plugin which has a nice facility for
displaying whether a file has mixed indents and/or trailing spaces
based on setting a variable:

let g:airline#extensions#whitespace#checks = [ 'indent', 'trailing' ]

However, I'd like to set that to only show mixed indenting problems
when editing Markdown files (that have the extension .md).

How can I configure this in my .vimrc so that it accommodates this...
I often have markdown and, say, Python files open at the same time (in
the latter I want both options, of course)...

c
--
Chris Lott <chris@chrislott.org>

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