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Description of problem:
The upstream kernel includes new memory allocation helper functions, vzalloc and vzalloc_node, which as one might guess, do the equivalent of vmalloc + memset 0. Multiple driver backport efforts for RHEL6.1 will benefit from these helper functions being generically available in the RHEL6 kernel.

Backport is a straight-forward drop-in of upstream commit e1ca7788dec6773b1a2bce51b7141948f2b8bccf, which applies with only minor line offset differences.

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.