On Thu, 2010-06-17 at 20:04 +0200, Jan Kara wrote: > + if (bdi_stat(bdi, BDI_WRITTEN) >= bdi->wb_written_head) > + bdi_wakeup_writers(bdi); For the paranoid amongst us you could make wb_written_head s64 and write the above as: if (bdi_stat(bdi, BDI_WRITTEN) - bdi->wb_written_head > 0) Which, if you assume both are monotonic and wb_written_head is always within 2^63 of the actual bdi_stat() value, should give the same end result and deal with wrap-around. For when we manage to create a device that can write 2^64 pages in our uptime :-) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href