Messages in this thread | | | Date | Wed, 3 Nov 1999 15:05:59 +0100 | From | Jamie Lokier <> | Subject | Re: remap_page_range / zeromap_page_range |
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Richard Dynes wrote: > These functions seem to be symmetric, and so I would assume that if > remap_page_range is called to create the mapping, that when the file > is closed zeromap_page_range should also be called.
It should call zap_page_range not zeromap_page_range. zap_page_range removes mappings; zeromap_page_range creates COW zero maps (cf. MAP_ANONYMOUS, /dev/zero).
However, this is handled for you in munmap(). As long as you have any mapping of the device, there will be a reference to its inode. The final call to the inode's release() will happen after the last reference is removed, at which point all the mappings have been removed anyway.
-- Jamie
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