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

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Message-Id: <1422121737-3686-1-git-send-email-dchurch@andplus.com>
Date:	Sat, 24 Jan 2015 12:48:55 -0500
From:	Daniel Church <dchurch@...plus.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, libc-alpha@...rceware.org
Subject: [PATCH v2 0/2] posix-timers: Prevents overrun counter overflow, adds DELAYTIMER_MAX

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@...utronix.de>

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