On Sun, Mar 03, 2013 at 06:27:55PM -0800, K. Y. Srinivasan wrote: > The split_page() function will be very useful for balloon drivers. On Hyper-V, > it will be very efficient to use 2M allocations in the guest as this (a) makes > the ballooning protocol with the host that much more efficient and (b) moving > memory in 2M chunks minimizes fragmentation in the host. Export the split_page() > function to let the guest allocations be in 2M chunks while the host is free to > return this memory at arbitrary granularity. > > > Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx> > --- > mm/page_alloc.c | 1 + > 1 files changed, 1 insertions(+), 0 deletions(-) > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 6cacfee..7e0ead6 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -1404,6 +1404,7 @@ void split_page(struct page *page, unsigned int order) > for (i = 1; i < (1 << order); i++) > set_page_refcounted(page + i); > } > +EXPORT_SYMBOL_GPL(split_page); When you export a symbol, you also need to post the code that is going to use that symbol, otherwise people don't really know how to judge this request. Can you just make this a part of your balloon driver update patch series instead? thanks, greg k-h -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>