Erik van Konijnenburg wrote:

...
For pagemap.h, just three functions are responsible for
an 82Kb callgraph: page_cache_alloc, add_to_page_cache,
wait_on_page_locked.

inlines in headers are just a pita.  I know it gets people
all excited but I'd say: make 'em macros.

___add_to_page_cache() can be just uninlined.  I intend
to gang-add pages into the cache and LRU anyway, so that
function should become for "occasional use only" anyway.
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