linux-kernel - Re: [PATCH] of: return NUMA_NO_NODE from fallback of_node_to

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Message-ID: <CAL_JsqKQPtNPfTAiqsKnFuU6e-qozzPgujM=8MHseG75R9cbSA@mail.gmail.com>
Date:	Mon, 13 Apr 2015 08:22:26 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	sparclinux@...r.kernel.org,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] of: return NUMA_NO_NODE from fallback of_node_to_nid()

On Wed, Apr 8, 2015 at 11:59 AM, Konstantin Khlebnikov
<khlebnikov@...dex-team.ru> wrote:
> Node 0 might be offline as well as any other numa node,
> in this case kernel cannot handle memory allocation and crashes.
>
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
> Fixes: 0c3f061c195c ("of: implement of_node_to_nid as a weak function")
> ---
>  drivers/of/base.c  |    2 +-
>  include/linux/of.h |    5 ++++-
>  2 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 8f165b112e03..51f4bd16e613 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -89,7 +89,7 @@ EXPORT_SYMBOL(of_n_size_cells);
>  #ifdef CONFIG_NUMA
>  int __weak of_node_to_nid(struct device_node *np)
>  {
> -       return numa_node_id();
> +       return NUMA_NO_NODE;

This is going to break any NUMA machine that enables OF and expects
the weak function to work.

Rob

>  }
>  #endif
>
> diff --git a/include/linux/of.h b/include/linux/of.h
> index dfde07e77a63..78a04ee85a9c 100644
> --- a/include/linux/of.h
> +++ b/include/linux/of.h
> @@ -623,7 +623,10 @@ static inline const char *of_prop_next_string(struct property *prop,
>  #if defined(CONFIG_OF) && defined(CONFIG_NUMA)
>  extern int of_node_to_nid(struct device_node *np);
>  #else
> -static inline int of_node_to_nid(struct device_node *device) { return 0; }
> +static inline int of_node_to_nid(struct device_node *device)
> +{
> +       return NUMA_NO_NODE;
> +}
>  #endif
>
>  static inline struct device_node *of_find_matching_node(
>
> --
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