[patch 03/39] add swap cache mapping comment

From: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]> Add some more comments about page->mapping and swapper_space, explaining their (historical and current) relationship. Such material can be extracted from the old GIT history (which I used for reference), but having it in the source is more

[patch 03/39] add swap cache mapping comment

From: Paolo 'Blaisorblade' Giarrusso <[EMAIL PROTECTED]> Add some more comments about page->mapping and swapper_space, explaining their (historical and current) relationship. Such material can be extracted from the old GIT history (which I used for reference), but having it in the source is more