linux-kernel - Re: RFC [PATCH] x86: make generic arch support NUMAQ

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Date:	Thu, 5 Jun 2008 10:26:46 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Sam Ravnborg" <sam@...nborg.org>
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" <linux-kernel@...r.kernel.org>
Subject: Re: RFC [PATCH] x86: make generic arch support NUMAQ

On Thu, Jun 5, 2008 at 4:00 AM, Sam Ravnborg <sam@...nborg.org> wrote:
> Hi Yinghai Lu.
>
> Some random comments after skimming through the diff.
>
> In general I like the simplification moving numaq.
> But there is too much ifdef going on - and it
> can be done better.
> Part of this may belong in a followup patch - other parts
> should be addressed in this patch.
>
>> +#if defined(CONFIG_X86_NUMAQ) || defined(CONFIG_X86_GENERICARCH)
>
> I counted several places where you test for the above.
> Introducing a CONFIG_X86_NUMAQ_OR_GENERIC would simplify stuff.
>
>
>> -obj-$(CONFIG_X86_NUMAQ)              += numaq_32.o
>> +
>> +ifeq ($(CONFIG_X86_NUMAQ), y)
>> +obj-y                                += numaq_32.o
>> +else
>> +ifeq ($(CONFIG_X86_GENERICARCH), y)
>> +obj-$(CONFIG_NUMA)           += numaq_32.o
>> +endif
>> +endif
>
> Can we move these dependencies to Kconfig?
> It should looks roughtly like this in the Makefile:
>
> obj-$(CONFIG_X86_NUMAQ)           += numaq_32.o
> obj-$(CONFIG_X86_NUMA_OR_GENERIC) += numaq_32.o
>
>
>> -#ifndef CONFIG_X86_NUMAQ
>>  static void __init setup_ioapic_ids_from_mpc(void)
>>  {
>>       union IO_APIC_reg_00 reg_00;
>> @@ -1725,6 +1724,11 @@ static void __init setup_ioapic_ids_from_mpc(void)
>>       unsigned char old_id;
>>       unsigned long flags;
>>
>> +#if defined(CONFIG_X86_NUMAQ) || defined(CONFIG_X86_GENERICARCH)
>> +     if (found_numaq)
>> +             return;
>> +#endif
> This ifdef should be found in a .h file defining a simple inline.
> Then you could just do:
>        if (found_numaq())
>                return;
>
>> +
>> +int mp_bus_id_to_node[MAX_MP_BUSSES];
>> +
>> +int mp_bus_id_to_local[MAX_MP_BUSSES];
>
> static? and introduce helper functions with proper
> prototypes in a .h file?
>
>> +++ b/arch/x86/mach-generic/probe.c
>> @@ -16,6 +16,9 @@
>>  #include <asm/apicdef.h>
>>  #include <asm/genapic.h>
>>
>> +#ifdef CONFIG_NUMA
>> +extern struct genapic apic_numaq;
>> +#endif
>
> No reason to use ifdef araound a extern.
>
>> diff --git a/arch/x86/pci/Makefile_32 b/arch/x86/pci/Makefile_32
>> index 89ec35d..88d6fcc 100644
>> --- a/arch/x86/pci/Makefile_32
>> +++ b/arch/x86/pci/Makefile_32
>> @@ -16,7 +16,13 @@ pci-y                              += legacy.o irq.o
>>  # Careful: VISWS and NUMAQ overrule the pci-y above. The colons are
>>  # therefor correct. This needs a proper fix by distangling the code.
>>  pci-$(CONFIG_X86_VISWS)              := visws.o fixup.o
>> -pci-$(CONFIG_X86_NUMAQ)              := numa.o irq.o
>> +
>> +ifeq ($(CONFIG_X86_NUMAQ), y)
>> +pci-y                                := numa.o irq.o
>> +endif
>> +ifeq ($(CONFIG_X86_GENERICARCH), y)
>> +pci-y                                += numa.o
>> +endif
>
> Use:
> pci-$(CONFIG_X86_NUMAQ)       :=  numa.o irq.o
> pci-$(CONFIG_X86_GENERICARCH) += numa.o
>
>
>> diff --git a/arch/x86/pci/numa.c b/arch/x86/pci/numa.c
>> index d9afbae..a4ff536 100644
>> --- a/arch/x86/pci/numa.c
>> +++ b/arch/x86/pci/numa.c
>> @@ -11,38 +11,18 @@
>>  #define XQUAD_PORTIO_BASE 0xfe400000
>>  #define XQUAD_PORTIO_QUAD 0x40000  /* 256k per quad. */
>>
>> -int mp_bus_id_to_node[MAX_MP_BUSSES];
>> +extern int mp_bus_id_to_node[MAX_MP_BUSSES];
>>  #define BUS2QUAD(global) (mp_bus_id_to_node[global])
>>
>> -int mp_bus_id_to_local[MAX_MP_BUSSES];
>> +extern int mp_bus_id_to_local[MAX_MP_BUSSES];
>>  #define BUS2LOCAL(global) (mp_bus_id_to_local[global])
>
> Move extern to .h file and consider introducing a helper function.
>
>> --- a/include/asm-x86/mmzone_32.h
>> +++ b/include/asm-x86/mmzone_32.h
>> @@ -12,9 +12,10 @@
>>  extern struct pglist_data *node_data[];
>>  #define NODE_DATA(nid)       (node_data[nid])
>>
>> -#ifdef CONFIG_X86_NUMAQ
>> +#if defined(CONFIG_X86_NUMAQ) || defined(CONFIG_X86_GENERICARCH)
>>       #include <asm/numaq.h>
>> -#elif defined(CONFIG_ACPI_SRAT)/* summit or generic arch */
>> +#endif
>> +#if defined(CONFIG_ACPI_SRAT)/* summit or generic arch */
>>       #include <asm/srat.h>
>>  #endif
>
> Move ifdef to .h files.
> If at all needed.
>
>> +#if defined(CONFIG_ACPI_SRAT)
>>       if (get_memcfg_from_srat())
>>               return;
>>  #endif
>
> Create a dummy inline in a .h file for this function
> so we can drop the ifdef here.
>
Thanks, will check it.

YH
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