SRU Justification:

Impact: Low memory platforms suffer OOM crashes because of memory
exhaustion

Patch Description: Read the initial value of buffer_size_kb and restore
on exit.

Patch: http://launchpadlibrarian.net/51934423/trace.txt

This patch has been reported by Bryan Wu to have fixed an issue on an ARM OEM 
platform.
This bug cause some real issues on low memory ARM platforms.

Scott Remnant has also concurred that the patch is correct this time.

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Kernel trace buffer should be cleared and size restored after profiling
https://bugs.launchpad.net/bugs/501715
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