6d1d976b2c
As of Linux 2.6.36 an elevator_change() interface was added. This commit updates vdev_elevator_switch() to use this interface when available, otherwise it falls back to the usermodehelper method. Original-patch-by: foobarz <sysop@xeon.(none)> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #906
26 lines
627 B
Plaintext
26 lines
627 B
Plaintext
dnl #
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dnl # 2.6.36 API change
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dnl # Verify the elevator_change() symbol is available.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_ELEVATOR_CHANGE], [
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AC_MSG_CHECKING([whether elevator_change() is available])
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tmp_flags="$EXTRA_KCFLAGS"
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EXTRA_KCFLAGS="-Wno-unused-but-set-variable"
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ZFS_LINUX_TRY_COMPILE([
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#include <linux/blkdev.h>
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#include <linux/elevator.h>
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],[
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int ret;
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struct request_queue *q = NULL;
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char *elevator = NULL;
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ret = elevator_change(q, elevator);
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],[
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AC_MSG_RESULT(yes)
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AC_DEFINE(HAVE_ELEVATOR_CHANGE, 1,
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[elevator_change() is available])
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],[
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AC_MSG_RESULT(no)
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])
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EXTRA_KCFLAGS="$tmp_flags"
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])
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