linux-kernel - Re: [PATCH v2 2/4] numa: avoid export acpi

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Date:	Mon, 4 Feb 2013 21:39:08 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	liguang <lig.fnst@...fujitsu.com>
cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	x86@...nel.org
Subject: Re: [PATCH v2 2/4] numa: avoid export acpi_numa variable

On Tue, 5 Feb 2013, 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.
> 
> Reviewed-by: David Rientjes <rientjes@...gle.com>

Again, this was never reviewed by me, please learn how to use these tags 
appropriately by reading Documentation/SubmittingPatches.

> Signed-off-by: liguang <lig.fnst@...fujitsu.com>
> ---
>  arch/x86/include/asm/acpi.h |    2 +-
>  arch/x86/kernel/acpi/srat.c |   15 ++++++++++-----
>  arch/x86/mm/numa.c          |    2 +-
>  arch/x86/xen/enlighten.c    |    2 +-
>  4 files changed, 13 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
> index 0c44630..6b9c861 100644
> --- a/arch/x86/include/asm/acpi.h
> +++ b/arch/x86/include/asm/acpi.h
> @@ -181,7 +181,7 @@ 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 4ddf497..0a4d7ee 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)
> +{
> +	acpi_numa = false;
> +}
> +
> +static void __init bad_srat(void)
>  {
> -	printk(KERN_ERR "SRAT: SRAT not used.\n");
>  	acpi_numa = -1;
> +	printk(KERN_ERR "SRAT: SRAT will not be used.\n");
>  }
>  
> -static __init inline int srat_disabled(void)
> +static bool __init srat_disabled(void)
>  {
> -	return acpi_numa < 0;
> +	return acpi_numa;
>  }
>  
>  /* Callback for SLIT parsing */
> diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> index 2d125be..870ca6b 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 138e566..a5f6353 100644
> --- a/arch/x86/xen/enlighten.c
> +++ b/arch/x86/xen/enlighten.c
> @@ -1415,7 +1415,7 @@ 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

You've declared disable_acpi_numa() but never defined it so this will 
fail at link time.  Please compile and test all of your changes with care 
before posting them or people will start to ignore your contributions.
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