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Commit cf43809d authored by Chris Redpath's avatar Chris Redpath Committed by Dmitry Shmidt
Browse files

sched/walt: Drop arch-specific timer access 



On at least one platform, occasionally the timer providing the wallclock
was able to be reset/go backwards for at least some time after wakeup.

Accept that this might happen and warn the first time, but otherwise just
carry on.

Change-Id: Id3164477ba79049561af7f0889cbeebc199ead4e
Signed-off-by: default avatarChris Redpath <chris.redpath@arm.com>
parent b7c491d2

kernel/sched/walt.c

+2 −5
Original line number Diff line number Diff line
@@ -22,7 +22,6 @@ 
#include <linux/syscore_ops.h>

#include <linux/cpufreq.h>

#include <trace/events/sched.h>

#include <clocksource/arm_arch_timer.h>

#include "sched.h"

#include "walt.h"
@@ -188,10 +187,8 @@ update_window_start(struct rq *rq, u64 wallclock) 
	delta = wallclock - rq->window_start;

	/* If the MPM global timer is cleared, set delta as 0 to avoid kernel BUG happening */

	if (delta < 0) {

		if (arch_timer_read_counter() == 0)

		delta = 0;

		else

			BUG_ON(1);

		WARN_ONCE(1, "WALT wallclock appears to have gone backwards or reset\n");

	}



	if (delta < walt_ravg_window)