[LTP] [PATCH] fix incorrect cleanup after hugeshmget05 test

[Jan T. <jt...@re...>]

I've noticed that in some cases the hugeshmget05 testcase is not
cleaning up properly after itself. It leaves hugepages reserved and 
does not free them. This could break further test runs. 

I think the problem is with signal handling. The testcase will do
rm_shm() only if it ends up properly. In case it's being killed by
SIGTERM signal (as seen from the testlog) the cleanup() function does
not return shared memory.

Without the patch I have to use ipcrm to remove all hugepages reserved
and not returned.

# grep -i unexpected RHEL-hugepage.run.log
hugeshmget05    1  TBROK  :  Unexpected signal 15 received.
# ipcs -m
------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status      
0x7400ee08 3932160    root      600        4          0                       
0x7400edde 4620289    root      600        4          0                       
0x00000000 4980738    gdm       600        393216     2          dest         
0x7400eddd 4587523    root      600        4          0                       
0x78002a3b 64552964   root      600        209715200  0                       
0x78002a38 64520197   root      600        209715200  0                       
# ipcrm -m 64552964 -m 64520197

With the patch the test returns hugepages back to the system even if it
gets signal 15.

Checked on RHEL5.5.

Thanks, Jan