[PATCH 3/3] introduce "account modifiers" mechanism in the kernel allowing a
module to modify the collected accounting for a given task. This implementation
is based on the "preempt_notifier". "account_system_time()" and
"account_user_time()" can call functions registered by a module to modify the
cputime value.

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
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