I think that do_page_cache_readahead() can be inlined in
blockable_page_cache_readahead(), this makes the code a bit more readable in
my opinion.

Also makes check_ra_success() static inline.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>