Hi NeilBrown, FYI, kernel build failed on tree: git://neil.brown.name/md for-next/14817e9 head: 14817e9a6dab027db44783d28429d14f601547a2 commit: 14817e9a6dab027db44783d28429d14f601547a2 [29/29] md/raid5: add blktrace calls config: sparc64-defconfig ERROR: "__tracepoint_block_unplug" [drivers/md/raid456.ko] undefined! The root cause is, the block trace points are only available when block/blk-core.c is compiled in. --- 0-DAY kernel build testing backend Open Source Technology Centre Fengguang Wu <wfg@xxxxxxxxxxxxxxx> Intel Corporation -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html