linux-kernel - Re: [PATCH 1/1] cpumask: add alloc_cpumask_var

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Date:	Tue, 16 Dec 2008 14:30:45 +1100
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	Mike Travis <travis@....com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Ingo Molnar <mingo@...hat.com>, linux-next@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] cpumask: add alloc_cpumask_var_node

Hi Mike,

Just some simple comments.

On Mon, 15 Dec 2008 18:32:51 -0800 Mike Travis <travis@....com> wrote:
>
> +/**
> + * alloc_cpumask_var - return an allocated struct cpumask
> + * @mask: pointer to cpumask_var_t where the cpumask is returned
> + * @cpu: GFP_ flags
       ^^^
flags

> + * alloc_cpumask_var_node - return an allocated struct cpumask on a
> + * specific node.
> + * @mask: pointer to cpumask_var_t where the cpumask is returned
> + * @cpu: GFP_ flags
       ^^^
flags

> + * @node: node to allocate memory on
> + *
> + * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is
> + * a nop returning a constant 1 (in <linux/cpumask.h>)
> + * Returns TRUE if memory allocation succeeded, FALSE otherwise.
> + */
> +bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
> +{
> +	if (likely(slab_is_available()))
> +		*mask = kmalloc_node(cpumask_size(), flags, node);
> +	else {
> +#ifdef CONFIG_DEBUG_PER_CPU_MAPS
> +		printk(KERN_ERR
> +			"=> alloc_cpumask_var_node: kmalloc not available!\n");
> +		dump_stack();
> +#endif
> +		*mask = NULL;
> +	}
> +#ifdef CONFIG_DEBUG_PER_CPU_MAPS
> +	if (!*mask) {
> +		printk(KERN_ERR "=> alloc_cpumask_var_node: failed!\n");
> +		dump_stack();
> +	}
> +#endif

So if !slab_is_available() and CONFIG_DEBUG_PER_CPU_MAPS is set, we get
two stack dumps?

> + * free_cpumask_var - frees memory allocated for a struct cpumask.
> + * mask: cpumask to free
      ^
missing '@'

> + * free_bootmem_cpumask_var - frees bootmem memory allocated for a struct cpumask.
> + * mask: cpumask to free
      ^
here as well.

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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