linux-kernel - Re: [PATCH v3 2/4] numa: avoid export acpi

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Date:	Tue, 5 Feb 2013 17:11:10 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	liguang <lig.fnst@...fujitsu.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	<x86@...nel.org>, <rientjes@...gle.com>
Subject: Re: [PATCH v3 2/4] numa: avoid export acpi_numa variable

2013/02/05 16:55, Yasuaki Ishimatsu wrote:
> 2013/02/05 16:36, liguang wrote:
>> acpi_numa is used to prevent srat table
>> being parsed, seems a little miss-named,
>> if 'noacpi' was specified by cmdline and
>> CONFIG_ACPI_NUMA was enabled, acpi_numa
>> will be operated directly from everywhere
>> it needed to disable/enable numa in acpi
>> mode which was a bad thing, so, try to
>> export a fuction to get srat table
>> enable/disable info.
>>
>> Signed-off-by: liguang <lig.fnst@...fujitsu.com>
>> ---
> 
> Hmm. Did you test the patch?
> By the patch, srat_disable() returns false(0) or 1. As a result,
> acpi_numa_x2apic_affinity_init(), acpi_numa_processor_affinity_init()
> and acpi_numa_memory_affinity_init() go wrong at following if sentence.
> 
> ---
> 	if (srat_disable())
> 		return -1;
> ---
> 
> When you change a return value of function, you should check othe
> functions which use it carefully.
> 
> And if you use acpi_numa as bool, you should use "acpi_numa = true"
> instead of "acpi_numa = 1"


x86_acpi_numa_init() also goes wrong.

> 
> Thanks,
> Yasuaki Ishimatsu
> 
>>    arch/x86/include/asm/acpi.h |    2 +-
>>    arch/x86/kernel/acpi/srat.c |   17 +++++++++++------
>>    arch/x86/mm/numa.c          |    2 +-
>>    arch/x86/xen/enlighten.c    |    2 +-
>>    4 files changed, 14 insertions(+), 9 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
>> index b31bf97..449e12a 100644
>> --- a/arch/x86/include/asm/acpi.h
>> +++ b/arch/x86/include/asm/acpi.h
>> @@ -177,7 +177,7 @@ static inline void disable_acpi(void) { }
>>    #define ARCH_HAS_POWER_INIT	1
>>    
>>    #ifdef CONFIG_ACPI_NUMA
>> -extern int acpi_numa;
>> +extern void disable_acpi_numa(void);
>>    extern int x86_acpi_numa_init(void);
>>    #endif /* CONFIG_ACPI_NUMA */
>>    
>> diff --git a/arch/x86/kernel/acpi/srat.c b/arch/x86/kernel/acpi/srat.c
>> index cdd0da9..8d7f3f8 100644
>> --- a/arch/x86/kernel/acpi/srat.c
>> +++ b/arch/x86/kernel/acpi/srat.c
>> @@ -24,22 +24,27 @@
>>    #include <asm/apic.h>
>>    #include <asm/uv/uv.h>
>>    
>> -int acpi_numa __initdata;
>> +static bool acpi_numa __initdata;
>>    
>>    static __init int setup_node(int pxm)
>>    {
>>    	return acpi_map_pxm_to_node(pxm);
>>    }
>>    
>> -static __init void bad_srat(void)
>> +void __init disable_acpi_numa(void)
>>    {
>> -	printk(KERN_ERR "SRAT: SRAT not used.\n");
>> -	acpi_numa = -1;
>> +	acpi_numa = false;
>>    }
>>    
>> -static __init inline int srat_disabled(void)
>> +static void __init bad_srat(void)
>>    {
>> -	return acpi_numa < 0;
>> +	disable_acpi_numa();
>> +	printk(KERN_ERR "SRAT: SRAT will not be used.\n");
>> +}
>> +

>> +static bool __init srat_disabled(void)
>> +{
>> +	return acpi_numa;

return !acpi_numa

Thanks,
Yasuaki Ishimatsu

>>    }
>>    
>>    /* Callback for SLIT parsing */
>> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
>> index 245a4ba..1ebc907 100644
>> --- a/arch/x86/mm/numa.c
>> +++ b/arch/x86/mm/numa.c
>> @@ -47,7 +47,7 @@ static __init int numa_setup(char *opt)
>>    #endif
>>    #ifdef CONFIG_ACPI_NUMA
>>    	if (!strncmp(opt, "noacpi", 6))
>> -		acpi_numa = -1;
>> +		disable_acpi_numa();
>>    #endif
>>    	return 0;
>>    }
>> diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
>> index 657eca9..3636bc6 100644
>> --- a/arch/x86/xen/enlighten.c
>> +++ b/arch/x86/xen/enlighten.c
>> @@ -1447,7 +1447,7 @@ asmlinkage void __init xen_start_kernel(void)
>>    	 * any NUMA information the kernel tries to get from ACPI will
>>    	 * be meaningless.  Prevent it from trying.
>>    	 */
>> -	acpi_numa = -1;
>> +	disable_acpi_numa();
>>    #endif
>>    
>>    	/* Don't do the full vcpu_info placement stuff until we have a
>>
> 
> 
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