linux-kernel - Re: [PATCH v7] timekeeping: Added a function to return tv_sec portion of ktime_get

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Date:	Wed, 29 Oct 2014 10:21:18 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Heena Sirwani <heenasirwani@...il.com>
cc:	linux-kernel@...r.kernel.org, john.stultz@...aro.org, arnd@...db.de
Subject: Re: [PATCH v7] timekeeping: Added a function to return tv_sec portion
 of ktime_get_ts64()

On Wed, 29 Oct 2014, Heena Sirwani wrote:
> +time64_t ktime_get_seconds(void)
> +{
> +	time64_t seconds;
> +	struct timekeeper *tk = &tk_core.timekeeper;
> +	unsigned int seq;
> +
> +	WARN_ON(timekeeping_suspended);

You want to have the same 64bit logic as you did for
ktime_get_real_seconds. So on 64bit it boils down to return
tk->ktime_sec.

> +
> +	do {
> +		seq = read_seqcount_begin(&tk_core.seq);
> +		seconds = tk->ktime_sec;
> +
> +	} while (read_seqcount_retry(&tk_core.seq, seq));
> +
> +	return seconds;
> +}

Thanks,

	tglx
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