linux-kernel - Re: [PATCH] x86: make generic arch support NUMAQ v2

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Date:	Thu, 5 Jun 2008 17:54:40 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Sam Ravnborg" <sam@...nborg.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: make generic arch support NUMAQ v2

On Thu, Jun 5, 2008 at 5:14 PM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>
> so it could fallback to normal numa.
>
> NUMAQ depends on GENERICARCH
>
> also decouple genericarch numa with acpi.
>
> Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
>
> Index: linux-2.6/arch/x86/Kconfig
> ===================================================================
> --- linux-2.6.orig/arch/x86/Kconfig
> +++ linux-2.6/arch/x86/Kconfig
> @@ -264,17 +264,6 @@ config X86_VOYAGER
>          If you do not specifically know you have a Voyager based machine,
>          say N here, otherwise the kernel you build will not be bootable.
>
> -config X86_NUMAQ
> -       bool "NUMAQ (IBM/Sequent)"
> -       depends on SMP && X86_32 && PCI
> -       select NUMA
> -       help
> -         This option is used for getting Linux to run on a (IBM/Sequent) NUMA
> -         multiquad box. This changes the way that processors are bootstrapped,
> -         and uses Clustered Logical APIC addressing mode instead of Flat Logical.
> -         You will need a new lynxer.elf file to flash your firmware with - send
> -         email to <Martin.Bligh@...ibm.com>.
> -
>  config X86_SUMMIT
>        bool "Summit/EXA (IBM x440)"
>        depends on X86_32 && SMP
> @@ -307,12 +296,12 @@ config X86_VISWS
>          and vice versa. See <file:Documentation/sgi-visws.txt> for details.
>
>  config X86_GENERICARCH
> -       bool "Generic architecture (Summit, bigsmp, ES7000, default)"
> +       bool "Generic architecture (NUMAQ, Summit, bigsmp, ES7000, default)"
>        depends on X86_32
>        help
> -          This option compiles in the Summit, bigsmp, ES7000, default subarchitectures.
> -         It is intended for a generic binary kernel.
> -         If you want a NUMA kernel, select ACPI.   We need SRAT for NUMA.
> +          This option compiles in the NUMAQ, Summit, bigsmp, ES7000, default
> +         subarchitectures.  It is intended for a generic binary kernel.
> +         You need enable NUMA, otherwise NUMAQ is skipped.
>
>  config X86_ES7000
>        bool "Support for Unisys ES7000 IA32 series"
> @@ -348,6 +337,17 @@ config X86_VSMP
>
>  endchoice
>
> +config X86_NUMAQ
> +       bool "NUMAQ (IBM/Sequent)"
> +       depends on SMP && X86_32 && PCI && X86_GENERICARCH
> +       select NUMA
> +       help
> +         This option is used for getting Linux to run on a NUMAQ (IBM/Sequent)
> +         NUMA multiquad box. This changes the way that processors are
> +         bootstrapped, and uses Clustered Logical APIC addressing mode instead
> +         of Flat Logical.  You will need a new lynxer.elf file to flash your
> +         firmware with - send email to <Martin.Bligh@...ibm.com>.
> +
>  config SCHED_NO_NO_OMIT_FRAME_POINTER
>        def_bool y
>        prompt "Single-depth WCHAN output"
> @@ -908,9 +908,9 @@ config X86_PAE
>  config NUMA
>        bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)"
>        depends on SMP
> -       depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL)
> +       depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || X86_GENERICARCH || X86_SUMMIT && ACPI) && EXPERIMENTAL)
>        default n if X86_PC
> -       default y if (X86_NUMAQ || X86_SUMMIT)
> +       default y if (X86_NUMAQ || X86_SUMMIT || X86_GENERICARCH)
>        help
>          Enable NUMA (Non Uniform Memory Access) support.
>          The kernel will try to allocate memory used by a CPU on the

Sam,

now NUMAQ depends on GENERICARCH.

and Ingo want to make oldconfig to migration NUMAQ....to select GENERICARCH...

but if i add select X86_GENERICARCH, make oldconfig will get

> make ARCH=i386 oldconfig
scripts/kconfig/conf -o arch/x86/Kconfig
arch/x86/Kconfig:299:error: found recursive dependency:
X86_GENERICARCH -> X86_NUMAQ -> X86_GENERICARCH -> <choice>
make[1]: *** [oldconfig] Error 1
make: *** [oldconfig] Error 2

YH
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