linux-kernel - Re: [PATCH] x86: let 64 bit to use 32 bit calibrate_apic

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Message-ID: <20080825164748.GB7249@lenovo>
Date:	Mon, 25 Aug 2008 20:47:48 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: let 64 bit to use 32 bit calibrate_apic_clock

[Yinghai Lu - Mon, Aug 25, 2008 at 01:04:34AM -0700]
| On Mon, Aug 25, 2008 at 12:47 AM, Ingo Molnar <mingo@...e.hu> wrote:
| >
| > * Yinghai Lu <yhlu.kernel@...il.com> wrote:
| >
| >> Signed-of-by: Yinghai Lu <yhlu.kernel@...il.com>
| >
| > applied to tip/irq/sparseirq - thanks Yinghai.
| >
| > btw., why was this bit needed:
| >
| >> @@ -659,6 +575,7 @@ static int __init calibrate_APIC_clock(v
| >>       delta = lapic_cal_t1 - lapic_cal_t2;
| >>       apic_printk(APIC_VERBOSE, "... lapic delta = %ld\n", delta);
| >>
| >> +#ifdef CONFIG_X86_PM_TIMER
| >>       /* Check, if the PM timer is available */
| >>       deltapm = lapic_cal_pm2 - lapic_cal_pm1;
| >>       apic_printk(APIC_VERBOSE, "... PM timer delta = %ld\n", deltapm);
| >> @@ -687,6 +604,7 @@ static int __init calibrate_APIC_clock(v
| >>               }
| >>               pm_referenced = 1;
| >>       }
| >> +#endif
| >
| > wouldnt this be a (small) fix for the pre-unification 32-bit side as
| > well, which we should put into tip/x86/urgent as well?
| 
| 64bit have those MACRO, it seems when CONFIG_EMBEDDED is set, could
| reduce some size if pm is not selected.
| 
| it seems not be urgent for 2.6.27.
| 
| YH
| 

Hey, APIC_DIVISOR is now wrong - it should be 16 for both modes
then, shouldn't it? :)

		- Cyrill -
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