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85391ee931
Sponsored-by: https://despairlabs.com/sponsor/ Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Signed-off-by: Rob Norris <robn@despairlabs.com> Closes #18077
28 lines
925 B
Plaintext
28 lines
925 B
Plaintext
dnl # SPDX-License-Identifier: CDDL-1.0
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dnl #
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dnl # Determine an available miscellaneous minor number which can be used
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dnl # for the /dev/zfs device. This is needed because kernel module
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dnl # auto-loading depends on registering a reserved non-conflicting minor
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dnl # number. Start with a large known available unreserved minor and work
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dnl # our way down to lower value if a collision is detected.
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dnl #
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AC_DEFUN([ZFS_AC_KERNEL_MISC_MINOR], [
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AC_MSG_CHECKING([whether /dev/zfs minor is available])
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for i in $(seq 249 -1 200); do
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if ! grep -q "^#define\s\+.*_MINOR\s\+.*$i" \
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${LINUX}/include/linux/miscdevice.h; then
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ZFS_DEVICE_MINOR="$i"
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AC_MSG_RESULT($ZFS_DEVICE_MINOR)
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AC_DEFINE_UNQUOTED([ZFS_DEVICE_MINOR],
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[$ZFS_DEVICE_MINOR], [/dev/zfs minor])
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break
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fi
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done
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AS_IF([ test -z "$ZFS_DEVICE_MINOR"], [
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AC_MSG_ERROR([
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*** No available misc minor numbers available for use.])
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])
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])
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