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Date:	Tue, 6 Oct 2015 18:03:25 +1100
From:	Stephen Rothwell <>
To:	Andrew Morton <>
	John Stultz <>,
	Thomas Gleixner <>
Subject: linux-next: build failure after merge of the akpm tree

Hi Andrew,

After merging the akpm tree, today's linux-next build (x86_64
allmodconfig) failed like this:

kernel/time/clocksource.c: In function 'clocksource_watchdog':
kernel/time/clocksource.c:220:3: error: implicit declaration of function 'abs64' [-Werror=implicit-function-declaration]
   if (abs64(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD) {

Caused by commit

  67dfae0cd72f ("clocksource: Fix abs() usage w/ 64bit values")

>From Linus' tree interacting with commit

  e75a4c084376 ("Remove abs64()")

from the akpm tree.

I have applied the following fix patch:

From: Stephen Rothwell <>
Date: Tue, 6 Oct 2015 17:59:03 +1100
Subject: [PATCH] clocksource: Fix for "Remove abs64()"

Signed-off-by: Stephen Rothwell <>
 kernel/time/clocksource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index f2c9b06c8ab7..6b473e4b2dad 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -217,7 +217,7 @@ static void clocksource_watchdog(unsigned long data)
 		/* Check the deviation from the watchdog clocksource. */
-		if (abs64(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD) {
+		if (abs(cs_nsec - wd_nsec) > WATCHDOG_THRESHOLD) {
 			pr_warn("timekeeping watchdog: Marking clocksource '%s' as unstable because the skew is too large:\n",
 			pr_warn("                      '%s' wd_now: %llx wd_last: %llx mask: %llx\n",

Stephen Rothwell          
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