Messages in this thread | | | Subject | Re: fuse, get_user_pages, flush_anon_page, aliasing caches and all that again | From | Miklos Szeredi <> | Date | Sun, 31 Dec 2006 10:10:35 +0100 |
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> Therefore, FUSE probably could have been fixed by judicious use > of copy_{to,from}_user_page() calls instead of adding this new > ad-hoc flush_anon_page() thing.
Probably, but I don't think either interface is perfect. copy_*_user_page() will double flush the user mapping (get_user_pages() already does a flush_dcache_page()). Actually nothing except ptrace uses the copy_*_user_page() interface even though there are many uses of get_user_pages().
What I think get_user_pages() really needs is a single operation that
- flushes the virtual address view - flushes the kernel view
regardles whether the page is anonymous or file backed.
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