linux-kernel - Re: [PATCH v5 2/3] of/selftest: Add self tests for manipulation of properties

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Message-Id: <902D15D9-439C-43BC-BD27-94785DA2F486@antoniou-consulting.com>
Date:	Sat, 16 Nov 2013 19:50:37 +0200
From:	Pantelis Antoniou <panto@...oniou-consulting.com>
To:	Grant Likely <grant.likely@...aro.org>
Cc:	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"David S. Miller" <davem@...emloft.net>,
	Nathan Fontenot <nfont@...ux.vnet.ibm.com>
Subject: Re: [PATCH v5 2/3] of/selftest: Add self tests for manipulation of properties

Hi Grant,

On Nov 15, 2013, at 7:46 PM, Grant Likely wrote:

> Adds a few simple test cases to ensure that addition, update and removal
> of device tree node properties works correctly.
> 
> Signed-off-by: Grant Likely <grant.likely@...aro.org>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Nathan Fontenot <nfont@...ux.vnet.ibm.com>
> Cc: Pantelis Antoniou <panto@...oniou-consulting.com>
> ---
> drivers/of/selftest.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 62 insertions(+)
> 
> diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
> index e21012bde639..cb8d3e722f76 100644
> --- a/drivers/of/selftest.c
> +++ b/drivers/of/selftest.c
> @@ -30,6 +30,67 @@ static struct selftest_results {
> 	} \
> }
> 
> +static void __init of_selftest_dynamic(void)
> +{
> +	struct device_node *np;
> +	struct property *prop;
> +
> +	np = of_find_node_by_path("/testcase-data");
> +	if (!np) {
> +		pr_err("missing testcase data\n");
> +		return;
> +	}
> +
> +	/* Array of 4 properties for the purpose of testing */
> +	prop = kzalloc(sizeof(*prop) * 4, GFP_KERNEL);
> +	if (!prop) {
> +		selftest(0, "kzalloc() failed\n");
> +		return;
> +	}
> +
> +	/* Add a new property - should pass*/
> +	prop->name = "new-property";
> +	prop->value = "new-property-data";
> +	prop->length = strlen(prop->value);
> +	selftest(of_add_property(np, prop) == 0, "Adding a new property failed\n");
> +
> +	/* Try to add an existing property - should fail */
> +	prop++;
> +	prop->name = "new-property";
> +	prop->value = "new-property-data-should-fail";
> +	prop->length = strlen(prop->value);
> +	selftest(of_add_property(np, prop) != 0,
> +		 "Adding an existing property should have failed\n");
> +
> +	/* Try to modify an existing property - should pass */
> +	prop->value = "modify-property-data-should-pass";
> +	prop->length = strlen(prop->value);
> +	selftest(of_update_property(np, prop) == 0,
> +		 "Updating an existing property should have passed\n");
> +
> +	/* Try to modify non-existent property - should pass*/
> +	prop++;
> +	prop->name = "modify-property";
> +	prop->value = "modify-missing-property-data-should-pass";
> +	prop->length = strlen(prop->value);
> +	selftest(of_update_property(np, prop) == 0,
> +		 "Updating a missing property should have passed\n");
> +
> +	/* Remove property - should pass */
> +	selftest(of_remove_property(np, prop) == 0,
> +		 "Removing a property should have passed\n");
> +
> +	/* Adding very large property - should pass */
> +	prop++;
> +	prop->name = "large-property-PAGE_SIZEx8";
> +	prop->length = PAGE_SIZE * 8;
> +	prop->value = kzalloc(prop->length, GFP_KERNEL);
> +	selftest(prop->value != NULL, "Unable to allocate large buffer\n");
> +	if (prop->value)
> +		selftest(of_add_property(np, prop) == 0,
> +			 "Adding a large property should have passed\n");
> +}
> +
> static void __init of_selftest_parse_phandle_with_args(void)
> {
> 	struct device_node *np;
> @@ -312,6 +373,7 @@ static int __init of_selftest(void)
> 	of_node_put(np);
> 
> 	pr_info("start of selftest - you will see error messages\n");
> +	of_selftest_dynamic();
> 	of_selftest_parse_phandle_with_args();
> 	of_selftest_property_match_string();
> 	of_selftest_parse_interrupts();
> -- 
> 1.8.3.2
> 

I like this. I'll add my overlay test cases somewhere around here.

I might need to introduce some new helper functions in order to generate
the overlay completely programmatically.

Regards

-- Pantelis



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