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Date:	Wed, 21 May 2014 08:19:34 +0800
From:	Chen Gang <>
CC:	Guan Xuetao <>,
	David Miller <>,,,
	"" <>
Subject: [PATCH linux-next] net/dccp/timer.c: use 'u64' instead of 's64' to
 avoid compiler's warning

'dccp_timestamp_seed' is initialized once by ktime_get_real() in
dccp_timestamping_init(). It is always less than ktime_get_real()
in dccp_timestamp().

Then, ktime_us_delta() in dccp_timestamp() will always return positive
number. So can use manual type cast to let compiler and do_div() know
about it to avoid warning.

The related warning (with allmodconfig under unicore32):

    CC [M]  net/dccp/timer.o
  net/dccp/timer.c: In function ‘dccp_timestamp’:
  net/dccp/timer.c:285: warning: comparison of distinct pointer types lacks a cast

Signed-off-by: Chen Gang <>
 net/dccp/timer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/dccp/timer.c b/net/dccp/timer.c
index 16f0b22..1cd46a3 100644
--- a/net/dccp/timer.c
+++ b/net/dccp/timer.c
@@ -280,7 +280,7 @@ static ktime_t dccp_timestamp_seed;
 u32 dccp_timestamp(void)
-	s64 delta = ktime_us_delta(ktime_get_real(), dccp_timestamp_seed);
+	u64 delta = (u64)ktime_us_delta(ktime_get_real(), dccp_timestamp_seed);
 	do_div(delta, 10);
 	return delta;
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