RFC: Remove unnecessary / duplicate OOM printks

[Joe Perches]

There are many thousands of printks for OOM conditions
in kernel sources.

These are almost always a duplication of a generic
OOM message from the mm subsystem.

The biggest difference between the generic OOM and
the specific OOM uses is that most of the specific
messages are emitted at KERN_ERR but the generic
message is at KERN_WARNING.

Many KB of code/text could be removed from the kernel.

Removal can be gradual and done by subsystem.

Some kmalloc's that are followed on failure by vmalloc
may need to add GFP_NOWARN.

Does anyone really believe the per site failure
messages are useful or really want them to keep them?

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