linux-kernel - Re: [PATCH] x86: devicetree: fix config option around x86_flattree_get

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Date:   Sat, 03 Mar 2018 11:17:12 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     frowand.list@...il.com
Cc:     Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ivan Gorinov <ivan.gorinov@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, geert@...ux-m68k.org,
        laurent.pinchart+renesas@...asonboard.com
Subject: Re: [PATCH] x86: devicetree: fix config option around x86_flattree_get_config()

Hi Frank,

Thank you for the patch.

On Saturday, 3 March 2018 06:12:26 EET frowand.list@...il.com wrote:
> From: Frank Rowand <frank.rowand@...y.com>
> 
> x86_flattree_get_config() is incorrectly protected by
> ifdef CONFIG_OF_FLATTREE.  It uses of_get_flat_dt_size(), which
> only exists if CONFIG_OF_EARLY_FLATTREE.  This issue has not
> been exposed previously because OF_FLATTREE did not occur unless
> it was selected by OF_EARLY_FLATTREE.  A devicetree overlay change
> is selecting OF_FLATTREE directly instead of indirectly enabling
> it by selecting OF_EARLY_FLATTREE.
> 
> This problem was exposed by a randconfig generated by the kbuild
> test robot, where Platform OLPC was enabled.  OLPC selects
> OF_PROMTREE instead of OF_EARLY_FLATREE.  The only other x86
> platform that selects OF is X86_INTEL_CE, which does select
> OF_EARLY_FLATTREE.
> 
> Signed-off-by: Frank Rowand <frank.rowand@...y.com>
> ---
> 
> The devicetree overlay change is in patch 1/4 of the series:
> https://lkml.org/lkml/2018/3/2/979
> 
> The pull request for the patch series that triggered the kbuild
> test robot is:
> https://lkml.org/lkml/2018/3/2/1065
> 
>  arch/x86/kernel/devicetree.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c
> index 25de5f6ca997..45416826f6ee 100644
> --- a/arch/x86/kernel/devicetree.c
> +++ b/arch/x86/kernel/devicetree.c
> @@ -259,7 +259,7 @@ static void __init dtb_apic_setup(void)
>  	dtb_ioapic_setup();
>  }
> 
> -#ifdef CONFIG_OF_FLATTREE
> +#ifdef CONFIG_OF_EARLY_FLATTREE
>  static void __init x86_flattree_get_config(void)
>  {
>  	u32 size, map_len;

This looks good to me. Could you respin the pull request with this patch 
included ? I need to send a pull request for a patch series based on your 
overlay changes, and I'd rather avoid breaking the build :-)

-- 
Regards,

Laurent Pinchart