freebsd-nq/config/kernel-misc-minor.m4
Olaf Faaland fa61e72340 Rename macro ZFS_MINOR due to Lustre conflict
Macro ZFS_MINOR, introduced in commit a6cc9756 to record the chosen
static minor number for /dev/zfs, conflicts with an existing macro
in Lustre.  The lustre macro (along with _MAJOR, _PATCH, _FIX) is
used to record the zfsonlinux version Lustre is being built against.

Since the Lustre macro came first, and is used in past versions of
lustre at least going back to 2.10, it makes sense to rename the
macro in ZFS instead of doing so in Lustre which would require
backporting the patch.

Reviewed-by: Giuseppe Di Natale <guss80@gmail.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #8195
2018-12-10 16:52:49 -08:00

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dnl #
dnl # Determine an available miscellaneous minor number which can be used
dnl # for the /dev/zfs device. This is needed because kernel module
dnl # auto-loading depends on registering a reserved non-conflicting minor
dnl # number. Start with a large known available unreserved minor and work
dnl # our way down to lower value if a collision is detected.
dnl #
AC_DEFUN([ZFS_AC_KERNEL_MISC_MINOR], [
AC_MSG_CHECKING([for available /dev/zfs minor])
for i in $(seq 249 -1 200); do
if ! grep -q "^#define\s\+.*_MINOR\s\+.*$i" \
${LINUX}/include/linux/miscdevice.h; then
ZFS_DEVICE_MINOR="$i"
AC_MSG_RESULT($ZFS_DEVICE_MINOR)
AC_DEFINE_UNQUOTED([ZFS_DEVICE_MINOR],
[$ZFS_DEVICE_MINOR], [/dev/zfs minor])
break
fi
done
AS_IF([ test -z "$ZFS_DEVICE_MINOR"], [
AC_MSG_ERROR([
*** No available misc minor numbers available for use.])
])
])