forked from luck/tmp_suning_uos_patched
kconfig: implement KCONFIG_PROBABILITY for randconfig
Currently the odds to set each symbol is (rounded): booleans: y: 50% n: 50% tristates: y: 33% m: 33% n: 33% Introduce a KCONFIG_PROBABILITY environment variable to tweak the probabilities (in percentage), as such: KCONFIG_PROBABILITY y:n split yⓂ️n split ----------------------------------------------------------------- [1] unset or empty 50 : 50 33 : 33 : 34 [2] N N : 100-N N/2 : N/2 : 100-N N:M N+M : 100-(N+M) N : M : 100-(N+M) N:M:L N : 100-N M : L : 100-(M+L) [1] The current behaviour is kept as default, for backward compatibility [2] The solution initially implemented by Peter for Buildroot, see: http://git.buildroot.org/buildroot/commit/?id=3435c1afb5 Signed-off-by: Peter Korsgaard <jacmet@uclibc.org> [yann.morin.1998@free.fr: add to Documentation/] Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
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@ -98,6 +98,33 @@ You can set this to the integer value used to seed the RNG, if you want
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to somehow debug the behaviour of the kconfig parser/frontends.
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If not set, the current time will be used.
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KCONFIG_PROBABILITY
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--------------------------------------------------
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This variable can be used to skew the probabilities. This variable can
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be unset or empty, or set to three different formats:
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KCONFIG_PROBABILITY y:n split y:m:n split
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-----------------------------------------------------------------
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unset or empty 50 : 50 33 : 33 : 34
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N N : 100-N N/2 : N/2 : 100-N
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[1] N:M N+M : 100-(N+M) N : M : 100-(N+M)
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[2] N:M:L N : 100-N M : L : 100-(M+L)
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where N, M and L are integers (in base 10) in the range [0,100], and so
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that:
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[1] N+M is in the range [0,100]
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[2] M+L is in the range [0,100]
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Examples:
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KCONFIG_PROBABILITY=10
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10% of booleans will be set to 'y', 90% to 'n'
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5% of tristates will be set to 'y', 5% to 'm', 90% to 'n'
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KCONFIG_PROBABILITY=15:25
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40% of booleans will be set to 'y', 60% to 'n'
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15% of tristates will be set to 'y', 25% to 'm', 60% to 'n'
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KCONFIG_PROBABILITY=10:15:15
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10% of booleans will be set to 'y', 90% to 'n'
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15% of tristates will be set to 'y', 15% to 'm', 70% to 'n'
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______________________________________________________________________
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Environment variables for 'silentoldconfig'
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@ -1107,7 +1107,51 @@ static void set_all_choice_values(struct symbol *csym)
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void conf_set_all_new_symbols(enum conf_def_mode mode)
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{
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struct symbol *sym, *csym;
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int i, cnt;
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int i, cnt, pby, pty, ptm; /* pby: probability of boolean = y
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* pty: probability of tristate = y
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* ptm: probability of tristate = m
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*/
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pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
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* below, otherwise gcc whines about
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* -Wmaybe-uninitialized */
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if (mode == def_random) {
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int n, p[3];
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char *env = getenv("KCONFIG_PROBABILITY");
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n = 0;
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while( env && *env ) {
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char *endp;
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int tmp = strtol( env, &endp, 10 );
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if( tmp >= 0 && tmp <= 100 ) {
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p[n++] = tmp;
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} else {
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errno = ERANGE;
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perror( "KCONFIG_PROBABILITY" );
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exit( 1 );
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}
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env = (*endp == ':') ? endp+1 : endp;
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if( n >=3 ) {
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break;
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}
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}
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switch( n ) {
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case 1:
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pby = p[0]; ptm = pby/2; pty = pby-ptm;
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break;
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case 2:
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pty = p[0]; ptm = p[1]; pby = pty + ptm;
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break;
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case 3:
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pby = p[0]; pty = p[1]; ptm = p[2];
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break;
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}
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if( pty+ptm > 100 ) {
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errno = ERANGE;
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perror( "KCONFIG_PROBABILITY" );
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exit( 1 );
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}
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}
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for_all_symbols(i, sym) {
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if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
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@ -1126,8 +1170,15 @@ void conf_set_all_new_symbols(enum conf_def_mode mode)
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sym->def[S_DEF_USER].tri = no;
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break;
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case def_random:
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cnt = sym->type == S_TRISTATE ? 3 : 2;
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sym->def[S_DEF_USER].tri = (tristate)(rand() % cnt);
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sym->def[S_DEF_USER].tri = no;
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cnt = rand() % 100;
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if (sym->type == S_TRISTATE) {
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if (cnt < pty)
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sym->def[S_DEF_USER].tri = yes;
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else if (cnt < (pty+ptm))
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sym->def[S_DEF_USER].tri = mod;
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} else if (cnt < pby)
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sym->def[S_DEF_USER].tri = yes;
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break;
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default:
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continue;
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