dnl # dnl # 2.6.29 API change dnl # In the 2.6.29 kernel blk_rq_bytes() was available as a GPL-only symbol. dnl # So we need to check the symbol license as well. As of 2.6.31 the dnl blk_rq_bytes() helper was changed to a static inline which we can use. dnl # AC_DEFUN([ZFS_AC_KERNEL_BLK_RQ_BYTES], [ AC_MSG_CHECKING([whether blk_rq_bytes() is available]) ZFS_LINUX_TRY_COMPILE([ #include <linux/blkdev.h> ],[ struct request *req = NULL; (void) blk_rq_bytes(req); ],[ AC_MSG_RESULT(yes) AC_DEFINE(HAVE_BLK_RQ_BYTES, 1, [blk_rq_bytes() is available]) ],[ AC_MSG_RESULT(no) ]) AC_MSG_CHECKING([whether blk_rq_bytes() is GPL-only]) ZFS_LINUX_TRY_COMPILE([ #include <linux/module.h> #include <linux/blkdev.h> MODULE_LICENSE("CDDL"); ],[ struct request *req = NULL; (void) blk_rq_bytes(req); ],[ AC_MSG_RESULT(no) ],[ AC_MSG_RESULT(yes) AC_DEFINE(HAVE_BLK_RQ_BYTES_GPL_ONLY, 1, [blk_rq_bytes() is GPL-only]) ]) ])