linux-kernel - Re: [Xen-devel] [RFC][PATCH 3/3] timekeeping: Fix potential lost pv notification of time change

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Date:	Tue, 10 Dec 2013 08:13:08 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"John Stultz" <john.stultz@...aro.org>
Cc:	"David Vrabel" <david.vrabel@...rix.com>,
	"Richard Cochran" <richardcochran@...il.com>,
	"Ingo Molnar" <mingo@...nel.org>,
	"Thomas Gleixner" <tglx@...utronix.de>, <xen-devel@...ts.xen.org>,
	"Prarit Bhargava" <prarit@...hat.com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"stable" <stable@...r.kernel.org>
Subject: Re: [Xen-devel] [RFC][PATCH 3/3] timekeeping: Fix potential
 lost pv notification of time change

>>> On 10.12.13 at 06:09, John Stultz <john.stultz@...aro.org> wrote:
>  static cycle_t logarithmic_accumulation(struct timekeeper *tk, cycle_t offset,
> -						u32 shift)
> +						u32 shift, int *action)

With plain int used here, ...

> @@ -1369,7 +1369,7 @@ static void update_wall_time(void)
>  	struct timekeeper *tk = &shadow_timekeeper;
>  	cycle_t offset;
>  	int shift = 0, maxshift;
> -	unsigned int action;
> +	unsigned int action = 0;

... and unsigned int used here, ...

> @@ -1404,7 +1404,7 @@ static void update_wall_time(void)
>  	maxshift = (64 - (ilog2(ntp_tick_length())+1)) - 1;
>  	shift = min(shift, maxshift);
>  	while (offset >= tk->cycle_interval) {
> -		offset = logarithmic_accumulation(tk, offset, shift);
> +		offset = logarithmic_accumulation(tk, offset, shift, &action);

... does this compile without warning for you?

Jan

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