RFC: option to toggle dtc checks on and off

[David Gibson]

Jon, I was hoping I'd get some comment on this patch eventually.

On Fri, Oct 28, 2011 at 04:15:25PM +1100, David Gibson wrote:
> Here is a draft patch which adds a -C option to dtc, allowing
> individual semantic checks to be turned on and off.  It also allows
> indivudual checks to be set as triggering either warnings or errors.
> 
> I have a couple of concerns about it in its present form.  First, the
> current syntax is that "-C -checkname" disables a check, "-C
> checkname" turns a check on as a warning and "-C +checkname" turns it
> on as an error.  I'm not convinced this is a great syntax.
> 
> Second, turning on a check will force on all prerequisite checks for
> it.  Turning a check off will disable all checks for which it is a
> prerequisite.  This seems necessary, since a check can't safely be
> executed without having first checked its prereqs, but this could have
> some very non-obvious effects from the command line.
> 
> Index: dtc/checks.c
> ===================================================================
> --- dtc.orig/checks.c	2011-04-11 13:47:41.000000000 +1000
> +++ dtc/checks.c	2011-10-28 14:42:31.846917479 +1100
> @@ -644,6 +644,69 @@ static struct check *check_table[] = {
>  	&obsolete_chosen_interrupt_controller,
>  };
>  
> +static void set_check_level(struct check *c, int level)
> +{
> +	int i;
> +
> +	fprintf(stderr, "Setting '%s' check level to %d\n",
> +		c->name, level);
> +
> +	if (level > c->level) {
> +		/* Raising level, also raise it for prereqs */
> +		for (i = 0; i < c->num_prereqs; i++)
> +			set_check_level(c->prereq[i], level);
> +	}
> +
> +	if (level < c->level) {
> +		/* Lowering level, also lower it for things this is
> +		 * the prereq for */
> +		for (i = 0; i < ARRAY_SIZE(check_table); i++) {
> +			struct check *cc = check_table[i];
> +			int j;
> +
> +			for (j = 0; j < cc->num_prereqs; j++)
> +				if (cc->prereq[j] == c)
> +					set_check_level(cc, level);
> +		}
> +	}
> +
> +	c->level = level;
> +}
> +
> +void parse_checks_option(const char *optarg)
> +{
> +	int i;
> +	const char *name;
> +	int level;
> +
> +	switch (optarg[0]) {
> +	case '-':
> +		level = IGNORE;
> +		name = optarg + 1;
> +		break;
> +
> +	case '+':
> +		level = ERROR;
> +		name = optarg + 1;
> +		break;
> +
> +	default:
> +		level = WARN;
> +		name = optarg;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(check_table); i++) {
> +		struct check *c = check_table[i];
> +
> +		if (streq(c->name, name)) {
> +			set_check_level(c, level);
> +			return;
> +		}
> +	}
> +
> +	die("Unrecognized check name \"%s\"\n", name);
> +}
> +
>  void process_checks(int force, struct boot_info *bi)
>  {
>  	struct node *dt = bi->dt;
> Index: dtc/dtc.c
> ===================================================================
> --- dtc.orig/dtc.c	2011-07-18 09:20:15.000000000 +1000
> +++ dtc/dtc.c	2011-10-28 14:43:34.743229363 +1100
> @@ -111,7 +111,7 @@ int main(int argc, char *argv[])
>  	minsize    = 0;
>  	padsize    = 0;
>  
> -	while ((opt = getopt(argc, argv, "hI:O:o:V:R:S:p:fqb:vH:s")) != EOF) {
> +	while ((opt = getopt(argc, argv, "hI:O:o:V:R:S:p:fqb:vH:sC:")) != EOF) {
>  		switch (opt) {
>  		case 'I':
>  			inform = optarg;
> @@ -162,6 +162,10 @@ int main(int argc, char *argv[])
>  			sort = 1;
>  			break;
>  
> +		case 'C':
> +			parse_checks_option(optarg);
> +			break;
> +
>  		case 'h':
>  		default:
>  			usage();
> Index: dtc/dtc.h
> ===================================================================
> --- dtc.orig/dtc.h	2011-10-12 09:56:55.000000000 +1100
> +++ dtc/dtc.h	2011-10-28 14:42:31.846917479 +1100
> @@ -225,6 +225,7 @@ void sort_tree(struct boot_info *bi);
>  
>  /* Checks */
>  
> +void parse_checks_option(const char *optarg);
>  void process_checks(int force, struct boot_info *bi);
>  
>  /* Flattened trees */
> 
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson