Messages in this thread | | | Date | Wed, 13 Feb 2002 16:52:34 -0200 (BRST) | From | Marcelo Tosatti <> | Subject | Re: [PATCH] __free_pages_ok oops |
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On Tue, 12 Feb 2002, Hugh Dickins wrote:
> On Sat, 9 Feb 2002, Benjamin LaHaise wrote: > > On Fri, Feb 08, 2002 at 05:46:56PM +0000, Hugh Dickins wrote: > > > Ben, you probably have an AIO opinion here. Is there a circumstance > > > in which AIO can unpin a user page at interrupt time, after the > > > calling task has (exited or) unmapped the page? > > > > If the user unmaps the page, then aio is left holding the last reference > > to the page and will unmap it from irq or bh context (potentially task > > context too). With networked aio, pages from userspace (anonymous or > > page cache pages) will be released by the network stack from bh context. > > Even now, I'm guess that should be possible with the zero copy flag...
Hugh. Are you sure we can free a page from IRQ/BH context with _current_ 2.4 ?
Please make sure so.
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