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68e8f59afb
Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #4665
86 lines
2.3 KiB
Plaintext
86 lines
2.3 KiB
Plaintext
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="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="${NO_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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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("$ZFS_META_LICENSE");
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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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],[
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AC_MSG_RESULT(no)
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])
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dnl #
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dnl # 4.7 API change
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dnl # Replace blk_queue_flush with blk_queue_write_cache
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dnl #
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AC_MSG_CHECKING([whether blk_queue_write_cache() exists])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/kernel.h>
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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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blk_queue_write_cache(q, true, true);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_BLK_QUEUE_WRITE_CACHE, 1,
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[blk_queue_write_cache() exists])
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AC_MSG_CHECKING([whether blk_queue_write_cache() is GPL-only])
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/blkdev.h>
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MODULE_LICENSE("$ZFS_META_LICENSE");
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],[
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struct request_queue *q = NULL;
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blk_queue_write_cache(q, true, true);
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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_WRITE_CACHE_GPL_ONLY, 1,
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[blk_queue_write_cache() is GPL-only])
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])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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