[PATCH v2 0/2] posix-timers: Prevents overrun counter overflow, adds DELAYTIMER_MAX

[Daniel Church]

If a timer overruns too many times before a call to timer_getoverrun the
overrun count can overflow and go negative.  POSIX.1-2001 specification
of timer_getoverrun() supports constant DELAYTIMER_MAX which prevents
overflow and caps overrun count.  Adds delaytimer_max value, caps
overrun count, and exposes value to userland via
/proc/sys/kernel/delaytimer_max.

Resolves https://bugzilla.kernel.org/show_bug.cgi?id=12665 - POSIX timers API does not support DELAYTIMER_MAX

v2: Consolidates overflow logic into helper function as suggested by Thomas Gleixner <tglx@xxxxxxxxxxxxx>

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