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authorYann E. MORIN <yann.morin.1998@free.fr>2013-04-13 17:18:36 +0200
committerYann E. MORIN <yann.morin.1998@free.fr>2013-04-25 00:16:30 +0200
commite43956e607692f9b1c710311e4a6591ffba1edf0 (patch)
treec42d170aa789a5ff0758a32b328e82ccbaa22142 /scripts/kconfig
parent0d8024c6ebadb68f1154377c2e1996b4e649e4c8 (diff)
downloadlinaro-lsk-e43956e607692f9b1c710311e4a6591ffba1edf0.tar.gz
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:m: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>
Diffstat (limited to 'scripts/kconfig')
-rw-r--r--scripts/kconfig/confdata.c57
1 files changed, 54 insertions, 3 deletions
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 89274809a82..fc45fc13787 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -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;