Signed-off-by: Iulian Olaru <iulianolaru249@yahoo.com>

The bug is raised beacause sleeping is not allowed in atomic context.

BUG: scheduling while atomic: insmod/228/0x00000002
1 lock held by insmod/228

Signed-off-by: Iulian Olaru <iulianolaru249@yahoo.com>

root@qemux86:~/skels/kernel_api# rmmod 3-memory/memory.ko
pid: 228, timestamp: -55002
pid: 0, timestamp: -55002
pid: 1, timestamp: -55002
pid: 2, timestamp: -55002

Signed-off-by: Iulian Olaru <iulianolaru249@yahoo.com>

before exiting: [
(1, 4294964624)
(0, 4294964624)
(205, 4294964624)
(236, 4294964623)
]

Signed-off-by: Iulian Olaru <iulianolaru249@yahoo.com>

To prevent removal, the value count should be above 6.

after first add: [
(1, 1823)
(0, 1823)
(205, 1823)
(239, 1823)
]

Signed-off-by: Iulian Olaru <iulianolaru249@yahoo.com>

after first add: [
(1, 4294951615)
(0, 4294951615)
(204, 4294951615)
(229, 4294951615)
]

after removing expired: [
(229, 4294951615)
]

Signed-off-by: Iulian Olaru <iulianolaru249@yahoo.com>

after new addition: [
(234, 396)
(1, 396)
(0, 396)
(203, 396)
(231, 4294962409)
]

lsmod:
    Tainted: G
list_test 16384 0 - Live 0xd0848000 (O)
list_sync 16384 1 list_test, Live 0xd0859000 (O)

unloading:
The unloading of the test module triggers the remove_expired
function from ex 6.
The module for ex6 is still loaded.

lsmod
    Tainted: G
list_sync 16384 0 - Live 0xd0859000 (O)

Signed-off-by: Iulian Olaru <iulianolaru249@yahoo.com>