Messages in this thread | ![/](/images/icornerl.gif) | | Date | Thu, 31 Jul 2003 15:16:11 -0700 | From | Andrew Morton <> | Subject | Re: Any reason why install_page and zap_page_range are not exported? |
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"Petr Vandrovec" <VANDROVE@vc.cvut.cz> wrote: > > Hi, > in one of my projects I found that what we were doing in 2.2.x/2.4.x > with strange hacks to mmap & nopage methods to get non-linear > mappings from some device can be done in 2.[56].x with remap_file_pages. > > Only two things are missing: install_page is not exported for modules, > so it is not possible to create own vma's populate function, as > there is no way how to put some page into pagetables. Or at least > I did not found such - even if I'll copy install_page's code to the > module, I'll just run to the other non-exported symbols :-(
Agree, install_page() should be exported. I'll submit a patch.
> And second missing thing is zap_page_range - we need way to tell > that specified page is not mapped anywhere (mostly for debugging > purposes). At worst install_page with PROT_NONE protection can be > used for that, but it seems natural that if there should be no page > there, we should just put nothing to the pagetables instead of some > fake page. And for large ranges doing one 200MB zap_page_range is > much faster than doing 50000 install_pages.
zap_page_range() sounds like an odd thing to be exporting. If we had an in-kernel module which needed it then OK. Do you have plans in that direction? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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