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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])
])
])
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