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Dear
Subscribers,
As most of you will
already know, one can use get_user_pages to get a struct pages list of a certain
user space buffer.
While doing this,
get_user_pages also locks the pages into physical mem (preventing them from
being swapped out to disk, or moved within phys mem) for usage with e.g.
DMA.
Now here's my
question: what happens if you call get_user_pages twice on the same buffer ?
Will it keep track of how many times a page has been locked
?
Meaning if I locked
the same buffer "twice", will it still be locked when I unlock it once (using
page_cache_release) ?
Regards,
Tom
