linear flavor is being removed in the kernel [1], so tests for the linear
flavor will fail. Gate tests for linear flavor with LINEAR=yes, so that we
can still run these tests for older kernels.

[1] https://lore.kernel.org/linux-raid/20231214222107.2016042-1-song@kernel.org/ (local)
Signed-off-by: Song Liu <song@kernel.org>
---
  tests/00linear     | 5 +++++
  tests/00names      | 8 +++++++-
  tests/00raid0      | 4 ++++
  tests/00readonly   | 8 +++++++-
  tests/02lineargrow | 5 +++++
  tests/03assem-incr | 8 +++++++-
  tests/03r0assem    | 4 ++++
  tests/04r0update   | 6 ++++++
  8 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/tests/00linear b/tests/00linear
index e3ac6555c9dd..5a1160851af2 100644
--- a/tests/00linear
+++ b/tests/00linear

@@ -1,6 +1,11 @@
  
  # create a simple linear
  
+if [ "$LINEAR" != "yes" ]; then
+  echo -ne 'skipping... '
+  exit 0
+fi
+
  mdadm -CR $md0 -l linear -n3 $dev0 $dev1 $dev2
  check linear
  testdev $md0 3 $mdsize2_l 1

diff --git a/tests/00names b/tests/00names
index 7a066d8fb2b7..d996befc5e8b 100644
--- a/tests/00names
+++ b/tests/00names

@@ -4,7 +4,13 @@ set -x -e
  conf=$targetdir/mdadm.conf
  echo "CREATE names=yes" > $conf
  
-for i in linear raid0 raid1 raid4 raid5 raid6
+levels=(raid0 raid1 raid4 raid5 raid6)
+
+if [ "$LINEAR" == "yes" ]; then
+  levels+=( linear )
+fi
+
+for i in ${levels[@]}
  do
    mdadm -CR --config $conf /dev/md/$i -l $i -n 4 $dev4 $dev3 $dev2 $dev1
    check $i

diff --git a/tests/00raid0 b/tests/00raid0
index 9b8896cbdc52..6407c320fd65 100644
--- a/tests/00raid0
+++ b/tests/00raid0

@@ -16,6 +16,10 @@ check raid0
  testdev $md0 5 $size 512
  mdadm -S $md0
  
+if [ "$LINEAR" != "yes" ]; then
+  echo -ne 'skipping... '
+  exit 0
+fi
  
  # now same again with different chunk size
  for chunk in 4 32 256

diff --git a/tests/00readonly b/tests/00readonly
index afe243b3a0b0..80b63629e4f9 100644
--- a/tests/00readonly
+++ b/tests/00readonly

@@ -1,8 +1,14 @@
  #!/bin/bash
  
+levels=(raid0 raid1 raid4 raid5 raid6 raid10)
+
+if [ "$LINEAR" == "yes" ]; then
+  levels+=( linear )
+fi
+
  for metadata in 0.9 1.0 1.1 1.2
  do
-	for level in linear raid0 raid1 raid4 raid5 raid6 raid10
+	for level in ${levels[@]}
  	do
  		if [[ $metadata == "0.9" && $level == "raid0" ]];
  		then

diff --git a/tests/02lineargrow b/tests/02lineargrow
index 595bf9f20802..d17e2326d13f 100644
--- a/tests/02lineargrow
+++ b/tests/02lineargrow

@@ -1,6 +1,11 @@
  
  # create a liner array, and add more drives to to.
  
+if [ "$LINEAR" != "yes" ]; then
+  echo -ne 'skipping... '
+  exit 0
+fi
+
  for e in 0.90 1 1.1 1.2
  do
    case $e in

diff --git a/tests/03assem-incr b/tests/03assem-incr
index f10a1a48ee5c..38880a7fed10 100644
--- a/tests/03assem-incr
+++ b/tests/03assem-incr

@@ -6,7 +6,13 @@ set -x -e
  # Here just test that a partly "-I" assembled array can
  # be completed with "-A"
  
-for l in 0 1 5 linear
+levels=(raid0 raid1 raid5)
+
+if [ "$LINEAR" == "yes" ]; then
+  levels+=( linear )
+fi
+
+for l in ${levels[@]}
  do
    mdadm -CR $md0 -l $l -n5 $dev0 $dev1 $dev2 $dev3 $dev4 --assume-clean
    mdadm -S md0

diff --git a/tests/03r0assem b/tests/03r0assem
index 44df06456233..f7c29e8c1ab6 100644
--- a/tests/03r0assem
+++ b/tests/03r0assem

@@ -64,6 +64,10 @@ mdadm --assemble --scan --config=$conf $md2
  $tst
  mdadm -S $md2
  
+if [ "$LINEAR" != "yes" ]; then
+  echo -ne 'skipping... '
+  exit 0
+fi
  
  ### Now for version 0...
  

diff --git a/tests/04r0update b/tests/04r0update
index b95efb06c761..c495f34a0a79 100644
--- a/tests/04r0update
+++ b/tests/04r0update

@@ -1,5 +1,11 @@
  
  # create a raid0, re-assemble with a different super-minor
+
+if [ "$LINEAR" != "yes" ]; then
+  echo -ne 'skipping... '
+  exit 0
+fi
+
  mdadm -CR -e 0.90 $md0 -llinear -n3 $dev0 $dev1 $dev2
  testdev $md0 3 $mdsize0 1
  minor1=`mdadm -E $dev0 | sed -n -e 's/.*Preferred Minor : //p'`