On Wed, 2015-05-27 at 11:23 -0400, Ido Yariv wrote:
> Signed-off-by: Ido Yariv <idox.ya...@intel.com>
> ---
> include/net/tcp.h | 9 +++++++++
> net/ipv4/tcp_output.c | 2 +-
> 2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 2bb2bad..86090b6 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -1751,4 +1751,13 @@ static inline void skb_set_tcp_pure_ack(struct sk_buff
> *skb)
> skb->truesize = 2;
> }
>
> +/* Convert msecs to jiffies, ensuring that the return value is always at
> least
> + * 2. This can be used when setting tick-based timers to guarantee that they
> + * won't expire right away.
> + */
> +static inline unsigned long tcp_safe_msecs_to_jiffies(const unsigned int m)
> +{
> + return max_t(u32, 2, msecs_to_jiffies(m));
> +}
Note that you can do slightly better if m is a constant at compile
time ;)
if (__builtin_constant_p(m) && m * 1000 >= 2 * HZ)
return msecs_to_jiffies(m);
return max_t(u32, 2, msecs_to_jiffies(m));
Or something like that ?
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