| Message ID | nycvar.YSQ.7.76.1711161956590.20817@knanqh.ubzr (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Ping. On Thu, 16 Nov 2017, Nicolas Pitre wrote: > Since commit 31847b67bec0 ("kconfig: allow use of relations other than > (in)equality") it is possible to use relational operators in Kconfig > statements. However, those operators give unexpected results when > applied to bool/tristate values: > > (n < y) = y (correct) > (m < y) = y (correct) > (n < m) = n (wrong) > > This happens because relational operators process bool and tristate > symbols as strings and m sorts before n. It makes little sense to do a > lexicographical compare on bool and tristate values though. > > Documentation/kbuild/kconfig-language.txt states that expression can have > a value of 'n', 'm' or 'y' (or 0, 1, 2 respectively for calculations). > Let's make it so for relational comparisons with bool/tristate > expressions as well and document them. If at least one symbol is an > actual string then the lexicographical compare works just as before. > > Signed-off-by: Nicolas Pitre <nico@linaro.org> > > diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt > index 262722d886..c4a293a03c 100644 > --- a/Documentation/kbuild/kconfig-language.txt > +++ b/Documentation/kbuild/kconfig-language.txt > @@ -200,10 +200,14 @@ module state. Dependency expressions have the following syntax: > <expr> ::= <symbol> (1) > <symbol> '=' <symbol> (2) > <symbol> '!=' <symbol> (3) > - '(' <expr> ')' (4) > - '!' <expr> (5) > - <expr> '&&' <expr> (6) > - <expr> '||' <expr> (7) > + <symbol1> '<' <symbol2> (4) > + <symbol1> '>' <symbol2> (4) > + <symbol1> '<=' <symbol2> (4) > + <symbol1> '>=' <symbol2> (4) > + '(' <expr> ')' (5) > + '!' <expr> (6) > + <expr> '&&' <expr> (7) > + <expr> '||' <expr> (8) > > Expressions are listed in decreasing order of precedence. > > @@ -214,10 +218,13 @@ Expressions are listed in decreasing order of precedence. > otherwise 'n'. > (3) If the values of both symbols are equal, it returns 'n', > otherwise 'y'. > -(4) Returns the value of the expression. Used to override precedence. > -(5) Returns the result of (2-/expr/). > -(6) Returns the result of min(/expr/, /expr/). > -(7) Returns the result of max(/expr/, /expr/). > +(4) If value of <symbol1> is respectively lower, greater, lower-or-equal, > + or greater-or-equal than value of <symbol2>, it returns 'y', > + otherwise 'n'. > +(5) Returns the value of the expression. Used to override precedence. > +(6) Returns the result of (2-/expr/). > +(7) Returns the result of min(/expr/, /expr/). > +(8) Returns the result of max(/expr/, /expr/). > > An expression can have a value of 'n', 'm' or 'y' (or 0, 1, 2 > respectively for calculations). A menu entry becomes visible when its > diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c > index cbf4996dd9..8cee597d33 100644 > --- a/scripts/kconfig/expr.c > +++ b/scripts/kconfig/expr.c > @@ -893,7 +893,10 @@ static enum string_value_kind expr_parse_string(const char *str, > switch (type) { > case S_BOOLEAN: > case S_TRISTATE: > - return k_string; > + val->s = !strcmp(str, "n") ? 0 : > + !strcmp(str, "m") ? 1 : > + !strcmp(str, "y") ? 2 : -1; > + return k_signed; > case S_INT: > val->s = strtoll(str, &tail, 10); > kind = k_signed; > -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 12/06/2017 07:40 AM, Nicolas Pitre wrote: > > Ping. > > On Thu, 16 Nov 2017, Nicolas Pitre wrote: > >> Since commit 31847b67bec0 ("kconfig: allow use of relations other than >> (in)equality") it is possible to use relational operators in Kconfig >> statements. However, those operators give unexpected results when >> applied to bool/tristate values: >> >> (n < y) = y (correct) >> (m < y) = y (correct) >> (n < m) = n (wrong) >> >> This happens because relational operators process bool and tristate >> symbols as strings and m sorts before n. It makes little sense to do a >> lexicographical compare on bool and tristate values though. >> >> Documentation/kbuild/kconfig-language.txt states that expression can have >> a value of 'n', 'm' or 'y' (or 0, 1, 2 respectively for calculations). >> Let's make it so for relational comparisons with bool/tristate >> expressions as well and document them. If at least one symbol is an >> actual string then the lexicographical compare works just as before. >> >> Signed-off-by: Nicolas Pitre <nico@linaro.org> Acked-by: Randy Dunlap <rdunlap@infradead.org> Tested-by: Randy Dunlap <rdunlap@infradead.org>
2017-12-07 0:40 GMT+09:00 Nicolas Pitre <nicolas.pitre@linaro.org>: > > Ping. > I see several kconfig patches queued up. Patches from Ulf Magnusson have been waiting for longer, so I will check them first, and I will come back to this as soon as possible.
2017-11-17 10:06 GMT+09:00 Nicolas Pitre <nicolas.pitre@linaro.org>: > Since commit 31847b67bec0 ("kconfig: allow use of relations other than > (in)equality") it is possible to use relational operators in Kconfig > statements. However, those operators give unexpected results when > applied to bool/tristate values: > > (n < y) = y (correct) > (m < y) = y (correct) > (n < m) = n (wrong) > > This happens because relational operators process bool and tristate > symbols as strings and m sorts before n. It makes little sense to do a > lexicographical compare on bool and tristate values though. > > Documentation/kbuild/kconfig-language.txt states that expression can have > a value of 'n', 'm' or 'y' (or 0, 1, 2 respectively for calculations). > Let's make it so for relational comparisons with bool/tristate > expressions as well and document them. If at least one symbol is an > actual string then the lexicographical compare works just as before. > > Signed-off-by: Nicolas Pitre <nico@linaro.org> > Applied to linux-kbuild/fixes. Thanks!
diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt index 262722d886..c4a293a03c 100644 --- a/Documentation/kbuild/kconfig-language.txt +++ b/Documentation/kbuild/kconfig-language.txt @@ -200,10 +200,14 @@ module state. Dependency expressions have the following syntax: <expr> ::= <symbol> (1) <symbol> '=' <symbol> (2) <symbol> '!=' <symbol> (3) - '(' <expr> ')' (4) - '!' <expr> (5) - <expr> '&&' <expr> (6) - <expr> '||' <expr> (7) + <symbol1> '<' <symbol2> (4) + <symbol1> '>' <symbol2> (4) + <symbol1> '<=' <symbol2> (4) + <symbol1> '>=' <symbol2> (4) + '(' <expr> ')' (5) + '!' <expr> (6) + <expr> '&&' <expr> (7) + <expr> '||' <expr> (8) Expressions are listed in decreasing order of precedence. @@ -214,10 +218,13 @@ Expressions are listed in decreasing order of precedence. otherwise 'n'. (3) If the values of both symbols are equal, it returns 'n', otherwise 'y'. -(4) Returns the value of the expression. Used to override precedence. -(5) Returns the result of (2-/expr/). -(6) Returns the result of min(/expr/, /expr/). -(7) Returns the result of max(/expr/, /expr/). +(4) If value of <symbol1> is respectively lower, greater, lower-or-equal, + or greater-or-equal than value of <symbol2>, it returns 'y', + otherwise 'n'. +(5) Returns the value of the expression. Used to override precedence. +(6) Returns the result of (2-/expr/). +(7) Returns the result of min(/expr/, /expr/). +(8) Returns the result of max(/expr/, /expr/). An expression can have a value of 'n', 'm' or 'y' (or 0, 1, 2 respectively for calculations). A menu entry becomes visible when its diff --git a/scripts/kconfig/expr.c b/scripts/kconfig/expr.c index cbf4996dd9..8cee597d33 100644 --- a/scripts/kconfig/expr.c +++ b/scripts/kconfig/expr.c @@ -893,7 +893,10 @@ static enum string_value_kind expr_parse_string(const char *str, switch (type) { case S_BOOLEAN: case S_TRISTATE: - return k_string; + val->s = !strcmp(str, "n") ? 0 : + !strcmp(str, "m") ? 1 : + !strcmp(str, "y") ? 2 : -1; + return k_signed; case S_INT: val->s = strtoll(str, &tail, 10); kind = k_signed;
Since commit 31847b67bec0 ("kconfig: allow use of relations other than (in)equality") it is possible to use relational operators in Kconfig statements. However, those operators give unexpected results when applied to bool/tristate values: (n < y) = y (correct) (m < y) = y (correct) (n < m) = n (wrong) This happens because relational operators process bool and tristate symbols as strings and m sorts before n. It makes little sense to do a lexicographical compare on bool and tristate values though. Documentation/kbuild/kconfig-language.txt states that expression can have a value of 'n', 'm' or 'y' (or 0, 1, 2 respectively for calculations). Let's make it so for relational comparisons with bool/tristate expressions as well and document them. If at least one symbol is an actual string then the lexicographical compare works just as before. Signed-off-by: Nicolas Pitre <nico@linaro.org> -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html