linux-kernel - Re: [PATCH] mm: numa: Initialse numa balancing after jump label initialisation

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Date:	Mon, 27 Jan 2014 14:43:36 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: numa: Initialse numa balancing after jump label
 initialisation

On Mon, 27 Jan 2014 15:51:27 +0000 Mel Gorman <mgorman@...e.de> wrote:

> The command line parsing takes place before jump labels are initialised which
> generates a warning if numa_balancing= is specified and CONFIG_JUMP_LABEL
> is set. On older kernls before commit c4b2c0c5 (static_key: WARN on
> usage before jump_label_init was called) the kernel would have crashed.
> This patch enables automatic numa balancing later in the initialisation
> process if numa_balancing= is specified.
> 
> ...
>
> @@ -2666,9 +2666,14 @@ static void __init check_numabalancing_enable(void)
>  	if (IS_ENABLED(CONFIG_NUMA_BALANCING_DEFAULT_ENABLED))
>  		numabalancing_default = true;
>  
> +	/* Parsed by setup_numabalancing. override == 1 enables, -1 disables */
> +	if (numabalancing_override)
> +		set_numabalancing_state(numabalancing_override == 1);
> +
>  	if (nr_node_ids > 1 && !numabalancing_override) {
> -		printk(KERN_INFO "Enabling automatic NUMA balancing. "
> -			"Configure with numa_balancing= or sysctl");
> +		printk(KERN_INFO "%s automatic NUMA balancing. "
> +			"Configure with numa_balancing= or sysctl",
> +			numabalancing_default ? "Enabling" : "Disabling");
>  		set_numabalancing_state(numabalancing_default);
>  	}
>  }

Current mainline is a bit different from this:

		printk(KERN_INFO "Enabling automatic NUMA balancing. "
			"Configure with numa_balancing= or the kernel.numa_balancing sysctl");

So this won't apply as-is to -stable.

I assume you suggested the -stable backport to fix the
it-crashes-before-c4b2c0c5 thing, so it isn't really needed in 3.12.x.

Or something.  Please sort all that out when Greg comes back with
a hey-that-didnt-apply.
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