kconfig: implement KCONFIG_PROBABILITY for randconfig (e43956e6) · Commits · 戴 / test

Documentation/kbuild/kconfig.txt

+27 −0

Original line number	Diff line number	Diff line
		@@ -98,6 +98,33 @@ You can set this to the integer value used to seed the RNG, if you want
		to somehow debug the behaviour of the kconfig parser/frontends.
		If not set, the current time will be used.

		KCONFIG_PROBABILITY
		--------------------------------------------------
		This variable can be used to skew the probabilities. This variable can
		be unset or empty, or set to three different formats:
		KCONFIG_PROBABILITY y:n split y:m:n split
		-----------------------------------------------------------------
		unset or empty 50 : 50 33 : 33 : 34
		N N : 100-N N/2 : N/2 : 100-N
		[1] N:M N+M : 100-(N+M) N : M : 100-(N+M)
		[2] N:M:L N : 100-N M : L : 100-(M+L)

		where N, M and L are integers (in base 10) in the range [0,100], and so
		that:
		[1] N+M is in the range [0,100]
		[2] M+L is in the range [0,100]

		Examples:
		KCONFIG_PROBABILITY=10
		10% of booleans will be set to 'y', 90% to 'n'
		5% of tristates will be set to 'y', 5% to 'm', 90% to 'n'
		KCONFIG_PROBABILITY=15:25
		40% of booleans will be set to 'y', 60% to 'n'
		15% of tristates will be set to 'y', 25% to 'm', 60% to 'n'
		KCONFIG_PROBABILITY=10:15:15
		10% of booleans will be set to 'y', 90% to 'n'
		15% of tristates will be set to 'y', 15% to 'm', 70% to 'n'

		______________________________________________________________________
		Environment variables for 'silentoldconfig'

scripts/kconfig/confdata.c

+54 −3

Original line number	Diff line number	Diff line
		@@ -1107,7 +1107,51 @@ static void set_all_choice_values(struct symbol *csym)
		void conf_set_all_new_symbols(enum conf_def_mode mode)
		{
		struct symbol sym, csym;
		int i, cnt;
		int i, cnt, pby, pty, ptm; /* pby: probability of boolean = y
		* pty: probability of tristate = y
		* ptm: probability of tristate = m
		*/

		pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
		* below, otherwise gcc whines about
		* -Wmaybe-uninitialized */
		if (mode == def_random) {
		int n, p[3];
		char *env = getenv("KCONFIG_PROBABILITY");
		n = 0;
		while( env && *env ) {
		char *endp;
		int tmp = strtol( env, &endp, 10 );
		if( tmp >= 0 && tmp <= 100 ) {
		p[n++] = tmp;
		} else {
		errno = ERANGE;
		perror( "KCONFIG_PROBABILITY" );
		exit( 1 );
		}
		env = (*endp == ':') ? endp+1 : endp;
		if( n >=3 ) {
		break;
		}
		}
		switch( n ) {
		case 1:
		pby = p[0]; ptm = pby/2; pty = pby-ptm;
		break;
		case 2:
		pty = p[0]; ptm = p[1]; pby = pty + ptm;
		break;
		case 3:
		pby = p[0]; pty = p[1]; ptm = p[2];
		break;
		}

		if( pty+ptm > 100 ) {
		errno = ERANGE;
		perror( "KCONFIG_PROBABILITY" );
		exit( 1 );
		}
		}

		for_all_symbols(i, sym) {
		if (sym_has_value(sym) \|\| (sym->flags & SYMBOL_VALID))
		@@ -1126,8 +1170,15 @@ void conf_set_all_new_symbols(enum conf_def_mode mode)
		sym->def[S_DEF_USER].tri = no;
		break;
		case def_random:
		cnt = sym->type == S_TRISTATE ? 3 : 2;
		sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
		sym->def[S_DEF_USER].tri = no;
		cnt = rand() % 100;
		if (sym->type == S_TRISTATE) {
		if (cnt < pty)
		sym->def[S_DEF_USER].tri = yes;
		else if (cnt < (pty+ptm))
		sym->def[S_DEF_USER].tri = mod;
		} else if (cnt < pby)
		sym->def[S_DEF_USER].tri = yes;
		break;
		default:
		continue;

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