e33045ee98
Apply the license specified in the META file to ensure the compatibility checks are all performed consistently. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2757
47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
dnl #
|
|
dnl # 2.6.36 API change
|
|
dnl # In 2.6.36 kernels the blk_queue_ordered() interface has been
|
|
dnl # replaced by the simpler blk_queue_flush(). However, while the
|
|
dnl # old interface was available to all the new one is GPL-only.
|
|
dnl # Thus in addition to detecting if this function is available
|
|
dnl # we determine if it is GPL-only. If the GPL-only interface is
|
|
dnl # there we implement our own compatibility function, otherwise
|
|
dnl # we use the function. The hope is that long term this function
|
|
dnl # will be opened up.
|
|
dnl #
|
|
AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLUSH], [
|
|
AC_MSG_CHECKING([whether blk_queue_flush() is available])
|
|
tmp_flags="$EXTRA_KCFLAGS"
|
|
EXTRA_KCFLAGS="${NO_UNUSED_BUT_SET_VARIABLE}"
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/blkdev.h>
|
|
],[
|
|
struct request_queue *q = NULL;
|
|
(void) blk_queue_flush(q, REQ_FLUSH);
|
|
],[
|
|
AC_MSG_RESULT(yes)
|
|
AC_DEFINE(HAVE_BLK_QUEUE_FLUSH, 1,
|
|
[blk_queue_flush() is available])
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
])
|
|
|
|
AC_MSG_CHECKING([whether blk_queue_flush() is GPL-only])
|
|
ZFS_LINUX_TRY_COMPILE([
|
|
#include <linux/module.h>
|
|
#include <linux/blkdev.h>
|
|
|
|
MODULE_LICENSE("$ZFS_META_LICENSE");
|
|
],[
|
|
struct request_queue *q = NULL;
|
|
(void) blk_queue_flush(q, REQ_FLUSH);
|
|
],[
|
|
AC_MSG_RESULT(no)
|
|
],[
|
|
AC_MSG_RESULT(yes)
|
|
AC_DEFINE(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY, 1,
|
|
[blk_queue_flush() is GPL-only])
|
|
])
|
|
EXTRA_KCFLAGS="$tmp_flags"
|
|
])
|