On Thu, Jul 03, 2014 at 05:52:12PM -0400, Naoya Horiguchi wrote: > We need the pagecache tags to be exported to userspace later in this > series for fincore(2), so this patch moves the definition to the new > include file for preparation. We also use the number of pagecache tags, > so this patch also adds it. > > Signed-off-by: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx> NACK. The radix tree tags are deeply internal implementation details. They are an artifact of the current mark-and-sweep writeback algorithm, and as such should never, ever be exposed to userspace, let alone fixed in an ABI we need to support forever more. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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>