[PATCH 04/12] mm: Add readahead address space operation

[Matthew Wilcox]

On Fri, Jan 24, 2020 at 07:57:40PM -0800, Randy Dunlap wrote:
> > +``readahead``
> > +	called by the VM to read pages associated with the address_space
> > +	object.  The pages are consecutive in the page cache and are
> > +        locked.  The implementation should decrement the page refcount after
> > +        attempting I/O on each page.  Usually the page will be unlocked by
> > +        the I/O completion handler.  If the function does not attempt I/O on
> > +        some pages, return the number of pages which were not read so the
> > +        common code can unlock the pages for you.
> > +
> 
> Please use consistent indentation (tabs).

This turned out to be not my fault.  The vim rst ... mode?  plugin?
Whatever it is, it's converting tabs to spaces!  To fix it, I had to
rename the file to .txt, make the edits, then rename it back.  This is
very poor behaviour.