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

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Date:	Thu, 5 Jun 2008 13:00:02 +0200
From:	Sam Ravnborg <sam@...nborg.org>
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" <linux-kernel@...r.kernel.org>
Subject: Re: RFC [PATCH] x86: make generic arch support NUMAQ

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.


	Sam
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