linux-kernel - Re: [Patch V4 11/42] x86, ioapic: kill unused global variable timer_through

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Message-ID: <53967992.2020808@linux.intel.com>
Date:	Tue, 10 Jun 2014 11:20:50 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Grant Likely <grant.likely@...aro.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>, x86@...nel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tony Luck <tony.luck@...el.com>,
	Joerg Roedel <joro@...tes.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, Ingo Molnar <mingo@...nel.org>
Subject: Re: [Patch V4 11/42] x86, ioapic: kill unused global variable timer_through_8259



On 2014/6/9 22:41, Maciej W. Rozycki wrote:
> On Mon, 9 Jun 2014, Jiang Liu wrote:
> 
>> index d4aba16e6bbf..94a56c233e87 100644
>> --- a/arch/x86/kernel/apic/io_apic.c
>> +++ b/arch/x86/kernel/apic/io_apic.c
>> @@ -2638,8 +2638,6 @@ static int __init disable_timer_pin_setup(char *arg)
>>  }
>>  early_param("disable_timer_pin_1", disable_timer_pin_setup);
>>  
>> -int timer_through_8259 __initdata;
>> -
>>  /*
>>   * This code may look a bit paranoid, but it's supposed to cooperate with
>>   * a wide range of boards and BIOS bugs.  Fortunately only the timer IRQ
>> @@ -2744,7 +2742,6 @@ static inline void __init check_timer(void)
>>  		legacy_pic->unmask(0);
>>  		if (timer_irq_works()) {
>>  			apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
>> -			timer_through_8259 = 1;
>>  			goto out;
>>  		}
>>  		/*
> 
>  So how does the new NMI watchdog handle systems that use this '8259A 
> Virtual Wire' mode, pretty common on pre-P6 computers?
Hi Maciej,
	We just kill the useless variable "timer_through_8259", 8259 virtual
wire mode is still supported.
Thanks!
Gerry

> 
>   Maciej
> 
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