Re: [PATCH 1/4] mm: cma: add currently allocated CMA buffers list to debugfs

[Joonsoo Kim]

On Fri, Feb 13, 2015 at 01:15:41AM +0300, Stefan Strogin wrote:
>  static int cma_debugfs_get(void *data, u64 *val)
>  {
>  	unsigned long *p = data;
> @@ -125,6 +221,52 @@ static int cma_alloc_write(void *data, u64 val)
>  
>  DEFINE_SIMPLE_ATTRIBUTE(cma_alloc_fops, NULL, cma_alloc_write, "%llu\n");
>  
> +static int cma_buffers_read(struct file *file, char __user *userbuf,
> +				size_t count, loff_t *ppos)
> +{
> +	struct cma *cma = file->private_data;
> +	struct cma_buffer *cmabuf;
> +	struct stack_trace trace;
> +	char *buf;
> +	int ret, n = 0;
> +
> +	if (*ppos < 0 || !count)
> +		return -EINVAL;
> +
> +	buf = kmalloc(count, GFP_KERNEL);
> +	if (!buf)
> +		return -ENOMEM;

Is count limited within proper size boundary for kmalloc()?
If it can exceed page size, using vmalloc() is better than this.

Thanks.
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