Hi,
On Thu, Jan 25, 2001 at 10:49:50AM -0600, Timur Tabi wrote:
>
> > set_bit(PG_reserved, &page->flags);
> > ioremap();
> > ...
> > iounmap();
> > clear_bit(PG_reserved, &page->flags);
>
> The problem with this is that between the ioremap and iounmap, the page is
> reserved. What happens if that page belongs to some disk buffer or user
> process, and some other process tries to free it. Won't that cause a problem?
It depends on how it is being used, but yes, it is likely to --- page
reference counts won't be updated properly on reserved pages, for
example. Why on earth do you want to do ioremap of something like a
page cache page, though? That is _not_ what ioremap is designed for!
--Stephen
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