47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
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dnl #
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dnl # 2.6.36 API change
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dnl # In 2.6.36 kernels the blk_queue_ordered() interface has been
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dnl # replaced by the simpler blk_queue_flush(). However, while the
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dnl # old interface was available to all the new one is GPL-only.
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dnl # Thus in addition to detecting if this function is available
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dnl # we determine if it is GPL-only. If the GPL-only interface is
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dnl # there we implement our own compatibility function, otherwise
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dnl # we use the function. The hope is that long term this function
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dnl # will be opened up.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_BLK_QUEUE_FLUSH], [
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AC_MSG_CHECKING([whether blk_queue_flush() is available])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/blkdev.h>
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],[
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struct request_queue *q = NULL;
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(void) blk_queue_flush(q, REQ_FLUSH);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_FLUSH, 1,
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[blk_queue_flush() is available])
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],[
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AC_MSG_RESULT(no)
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])
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AC_MSG_CHECKING([whether blk_queue_flush() is GPL-only])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/module.h>
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#include <linux/blkdev.h>
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MODULE_LICENSE("CDDL");
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],[
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struct request_queue *q = NULL;
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(void) blk_queue_flush(q, REQ_FLUSH);
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],[
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AC_MSG_RESULT(no)
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_FLUSH_GPL_ONLY, 1,
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[blk_queue_flush() is GPL-only])
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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