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Date:	Wed, 3 Oct 2012 09:20:02 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Stephen Hemminger" <shemminger@...tta.com>,
	"Julian Anastasov" <ja@....bg>
Cc:	"Eric Dumazet" <eric.dumazet@...il.com>, <netdev@...r.kernel.org>
Subject: RE: [PATCH v2] iproute2: add support for tcp_metrics

> > 	fprintf(fp, "%lluus",
> > 		((__u64) val * 1000) >> 2);
...
> Remember u64 is not always same as unsigned long long.
> One safe way of handling this is:
...
> 	fprintf(fp, "%"PRIu64"us",
>  		((__u64) val * 1000) >> 3);

Or convert the constant.
	fprintf(fp, "%lluus", (val * 1000ull) >> 2);
which may well generate better code on 32bit systems.

	David


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