Re: fix iounmap and a pageattr memleak (x86 and x86-64)

[Andrew Morton]

Dave Hansen <haveblue@xxxxxxxxxx> wrote:
>
> Andrea Arcangeli wrote:
> > Still I recommend investigating _why_ debug_pagealloc is violating the
> > API. It might not be necessary to wait for the pageattr universal
> > feature to make DEBUG_PAGEALLOC work safe.
> 
> This makes the DEBUG_PAGEALLOC stuff symmetric enough to boot for me, 
> and it's pretty damn simple.  Any ideas for doing this without bloating 
> 'struct page', even in the debugging case?

You could use a bit from page->flags.  But CONFIG_DEBUG_PAGEALLOC uses so
much additional memory nobody would notice anyway.

hm.  Or maybe page->mapcount is available on these pages.
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