Commits
Jens Axboe committed cb684b5bcd6
block: fix linkage problem with blk_iopoll and !CONFIG_BLOCK kernel/built-in.o:(.data+0x17b0): undefined reference to `blk_iopoll_enabled' Since the extern declaration makes the compile work, but the actual symbol is missing when block/blk-iopoll.o isn't linked in. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>