From: Stephen Boyd <sboyd@codeaurora.org>
Date: Thu, 22 May 2014 00:42:26 +0000 (+1000)
Subject: sched_clock: document 4Mhz vs 1Mhz decision
X-Git-Tag: next-20140530~2^2~449
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0e2e205c6198db9277bd64d9c98bb609dcdd7515;p=karo-tx-linux.git

sched_clock: document 4Mhz vs 1Mhz decision

Bo Shen sent a patch to change this to 1Mhz instead of 4Mhz but according
to Russell King the use of 4Mhz was intentional.  Add a comment to this
effect so that others don't try to change the code as well.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: Bo Shen <voice.shen@atmel.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index 4d23dc4d8139..5038b4d3b76d 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -154,6 +154,10 @@ void __init sched_clock_register(u64 (*read)(void), int bits,
 	raw_write_seqcount_end(&cd.seq);
 
 	r = rate;
+	/*
+	 * Use 4MHz instead of 1MHz so that things like 1.832Mhz show as
+	 * 1832Khz
+	 */
 	if (r >= 4000000) {
 		r /= 1000000;
 		r_unit = 'M';