linux-kernel - Re: [Linux-nvdimm] [PATCH 05/21] nfit-test: manufactured NFITs for interface development

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Date:	Fri, 24 Apr 2015 17:59:01 -0400
From:	Linda Knippers <linda.knippers@...com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Linux-nvdimm] [PATCH 05/21] nfit-test: manufactured NFITs for
 interface development

On 4/24/2015 5:50 PM, Dan Williams wrote:
> On Fri, Apr 24, 2015 at 2:47 PM, Linda Knippers <linda.knippers@...com> wrote:
>> On 4/17/2015 9:35 PM, Dan Williams wrote:
>> :
>>> diff --git a/drivers/block/nd/Kconfig b/drivers/block/nd/Kconfig
>>> index 5fa74f124b3e..0106b3807202 100644
>>> --- a/drivers/block/nd/Kconfig
>>> +++ b/drivers/block/nd/Kconfig
>>> @@ -41,4 +41,24 @@ config NFIT_ACPI
>>>         register the platform-global NFIT blob with the core.  Also
>>>         enables the core to craft ACPI._DSM messages for platform/dimm
>>>         configuration.
>>> +
>>> +config NFIT_TEST
>>> +     tristate "NFIT TEST: Manufactured NFIT for interface testing"
>>> +     depends on DMA_CMA
>>> +     depends on ND_CORE=m
>>> +     depends on m
>>> +     help
>>> +       For development purposes register a manufactured
>>> +       NFIT table to verify the resulting device model topology.
>>> +       Note, this module arranges for ioremap_cache() to be
>>> +       overridden locally to allow simulation of system-memory as an
>>> +       io-memory-resource.
>>> +
>>> +       Note, this test expects to be able to find at least
>>> +       256MB of CMA space (CONFIG_CMA_SIZE_MBYTES) or it will fail to
>>
>> It seems to actually be wanting >= 584MB.
> 
> Ah, true, this Kconfig text is stale.  Will fix.

Thanks.  One more question...

> +#ifdef CONFIG_CMA_SIZE_MBYTES
> +#define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
> +#else
> +#define CMA_SIZE_MBYTES 0
> +#endif
> +
> +static __init int nfit_test_init(void)
> +{
> +	int rc, i;
> +
> +	if (CMA_SIZE_MBYTES < 584) {
> +		pr_err("need CONFIG_CMA_SIZE_MBYTES >= 584 to load\n");
> +		return -EINVAL;
> +	}
> +

Since the kernel takes a cma= boot parameter, it would be nice if
this check is against what the kernel is using rather than the config
option.  Is that possible?

-- ljk
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