sched/fair: Remove unused cfs_rq_clock_task() function
cfs_rq_clock_task() was first introduced and used in: f1b17280 ("sched: Maintain runnable averages across throttled periods") Over time its use has been graduately removed by the following commits: d31b1a66 ("sched/fair: Factorize PELT update") 23127296 ("sched/fair: Update scale invariance of PELT") Today, there is no single user left, so it can be safely removed. Found via the -Wunused-function build warning. Signed-off-by: Qian Cai <cai@lca.pw> Cc: Ben Segall <bsegall@google.com> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Juri Lelli <juri.lelli@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mel Gorman <mgorman@suse.de> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vincent Guittot <vincent.guittot@linaro.org> Link: https://lkml.kernel.org/r/1568668775-2127-1-git-send-email-cai@lca.pw [ Rewrote the changelog. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
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