recently oracle adds support on ASMlib+RHEL6 kernel.
will seems some policies already being changed.
if someone interested, refer to
http://www.oracle.com/technetwork/server-storage/linux/asmlib/rhel6-1940776.html
To enable ASMlib supports, please download following file from oracle web-site
and get supports ‘kmod-oracleasm’ from RedHat RHN or related support.
good luck.