Re: [Xen-devel] crash in page_list_* macro

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 12/02/2009 03:42, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> Is the memory where the list header is stored overloaded and
> sometimes overwritten for other purposes?  Note all pages
> on my page_list have been gotten via pi=alloc_domheap_pages(0,0,0).
> Next I use va=page_to_virt(pi), use the page for awhile,
> use pi=virt_to_page(va) and put it on the page_list, then
> later when I page_list_remove_head(my_page_list), the
> list pointers are apparently corrupt.

So long as you allocate anonymous domheap memory, or xenheap memory, the
page_list fields should belong to you. The list structure is pretty simple
and I can't see anything wrong with the macros. An empty list is noted by
NULL head/tail pointers, otherwise point at head/tail pages within which
next/prev pointers are 32-bit MFNs. The head and tail pages do not point at
the page_list_head but instead contain ~0 sentinel next/prev link values.

 -- Keir



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