Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755452AbcJSXqW (ORCPT ); Wed, 19 Oct 2016 19:46:22 -0400 Received: from alt32.smtp-out.videotron.ca ([24.53.0.21]:24591 "EHLO alt32.smtp-out.videotron.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755462AbcJSXnN (ORCPT ); Wed, 19 Oct 2016 19:43:13 -0400 X-Authority-Analysis: v=2.1 cv=Gfm35VjL c=1 sm=1 tr=0 a=keA3yYpnlypCNW5BNWqu+w==:117 a=keA3yYpnlypCNW5BNWqu+w==:17 a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=CH0kA5CcgfcA:10 a=KKAkSRfTAAAA:8 a=jzWnGAVyiW7GBVbT1VoA:9 a=cvBusfyB2V15izCimMoJ:22 From: Nicolas Pitre To: John Stultz , Richard Cochran , Yann E MORIN Cc: Thomas Gleixner , Josh Triplett , netdev@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 1/4] kconfig: introduce the "imply" keyword Date: Wed, 19 Oct 2016 19:42:50 -0400 Message-Id: <1476920573-14384-2-git-send-email-nicolas.pitre@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1476920573-14384-1-git-send-email-nicolas.pitre@linaro.org> References: <1476920573-14384-1-git-send-email-nicolas.pitre@linaro.org> X-CMAE-Envelope: MS4wfA0Nl41VRlFfxPUZSsmkQJgN5aYX440PNITuSfl7m79UfmGXFlyO/adlOVKlrNV7mXKzw8xZsE2IsjnKabGV9uDEGEie9EB42FSmpwmvNQRFmhjXTeAP t09UskO3oi8mwC5Hg8IspabY3F2LGgNl3rTQLoyrAAD0KuO6hsHioTZN3y95AYFwogftkskOuB0vf/5uOtMx4/EBffqsG0FRrpEiaQ3NnddgnhhjxNkrZ/cV bu3qvEtcnyQ4a3lyFZiHlFPgzfuQlwY5Q6zTIB0s+KGGVE1iAmowxasNUKe56DEtHdn0aRKqFuPa31F6BGzxcOcz7/hVtHQxCIn4yGZnRxFLrZ5cJnTcc8NL n7/GAmv1q/z0LSUMHKXXmPrGjUPAOTidc0qY3lLMogmiZvGSYyE6FK7b1c/NAAXQDEBeg4Wc Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11772 Lines: 381 The "imply" keyword is a weak version of "select" where the target config symbol can still be turned off, avoiding those pitfalls that come with the "select" keyword. This is useful e.g. with multiple drivers that want to indicate their ability to hook into a given subsystem while still being able to configure that subsystem out and keep those drivers selected. Currently, the same effect can almost be achieved with: config DRIVER_A tristate config DRIVER_B tristate config DRIVER_C tristate config DRIVER_D tristate [...] config SUBSYSTEM_X tristate default DRIVER_A || DRIVER_B || DRIVER_C || DRIVER_D || [...] This is unwieldly to maintain especially with a large number of drivers. Furthermore, there is no easy way to restrict the choice for SUBSYSTEM_X to y or n, excluding m, when some drivers are built-in. The "select" keyword allows for excluding m, but it excludes n as well. Hence this "imply" keyword. The above becomes: config DRIVER_A tristate imply SUBSYSTEM_X config DRIVER_B tristate imply SUBSYSTEM_X [...] config SUBSYSTEM_X tristate This is much cleaner, and way more flexible than "select". SUBSYSTEM_X can still be configured out, and it can be set as a module when none of the drivers are selected or all of them are also modular. Signed-off-by: Nicolas Pitre --- Documentation/kbuild/kconfig-language.txt | 28 ++++++++++++++++ scripts/kconfig/expr.h | 2 ++ scripts/kconfig/menu.c | 55 ++++++++++++++++++++++--------- scripts/kconfig/symbol.c | 26 ++++++++++++++- scripts/kconfig/zconf.gperf | 1 + scripts/kconfig/zconf.y | 16 +++++++-- 6 files changed, 109 insertions(+), 19 deletions(-) diff --git a/Documentation/kbuild/kconfig-language.txt b/Documentation/kbuild/kconfig-language.txt index 069fcb3eef..c96127f648 100644 --- a/Documentation/kbuild/kconfig-language.txt +++ b/Documentation/kbuild/kconfig-language.txt @@ -113,6 +113,33 @@ applicable everywhere (see syntax). That will limit the usefulness but on the other hand avoid the illegal configurations all over. +- weak reverse dependencies: "imply" ["if" ] + This is similar to "select" as it enforces a lower limit on another + symbol except that the "implied" config symbol's value may still be + set to n from a direct dependency or with a visible prompt. + Given the following example: + + config FOO + tristate + imply BAZ + + config BAZ + tristate + depends on BAr + + The following values are possible: + + FOO BAR BAR's default choice for BAZ + --------------- --------------- --------------- -------------- + n y n N/m/y + m y m M/y/n + y y y Y/n + y n * N + + This is useful e.g. with multiple drivers that want to indicate their + ability to hook into a given subsystem while still being able to + configure that subsystem out and keep those drivers selected. + - limiting menu display: "visible if" This attribute is only applicable to menu blocks, if the condition is false, the menu block is not displayed to the user (the symbols @@ -481,6 +508,7 @@ historical issues resolved through these different solutions. b) Match dependency semantics: b1) Swap all "select FOO" to "depends on FOO" or, b2) Swap all "depends on FOO" to "select FOO" + c) Consider the use of "imply" instead of "select" The resolution to a) can be tested with the sample Kconfig file Documentation/kbuild/Kconfig.recursion-issue-01 through the removal diff --git a/scripts/kconfig/expr.h b/scripts/kconfig/expr.h index 973b6f7333..a73f762c48 100644 --- a/scripts/kconfig/expr.h +++ b/scripts/kconfig/expr.h @@ -85,6 +85,7 @@ struct symbol { struct property *prop; struct expr_value dir_dep; struct expr_value rev_dep; + struct expr_value implied; }; #define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next) if (sym->type != S_OTHER) @@ -136,6 +137,7 @@ enum prop_type { P_DEFAULT, /* default y */ P_CHOICE, /* choice value */ P_SELECT, /* select BAR */ + P_IMPLY, /* imply BAR */ P_RANGE, /* range 7..100 (for a symbol) */ P_ENV, /* value from environment variable */ P_SYMBOL, /* where a symbol is defined */ diff --git a/scripts/kconfig/menu.c b/scripts/kconfig/menu.c index aed678e8a7..e9357931b4 100644 --- a/scripts/kconfig/menu.c +++ b/scripts/kconfig/menu.c @@ -233,6 +233,8 @@ static void sym_check_prop(struct symbol *sym) { struct property *prop; struct symbol *sym2; + char *use; + for (prop = sym->prop; prop; prop = prop->next) { switch (prop->type) { case P_DEFAULT: @@ -252,18 +254,20 @@ static void sym_check_prop(struct symbol *sym) } break; case P_SELECT: + case P_IMPLY: + use = prop->type == P_SELECT ? "select" : "imply"; sym2 = prop_get_symbol(prop); if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE) prop_warn(prop, - "config symbol '%s' uses select, but is " - "not boolean or tristate", sym->name); + "config symbol '%s' uses %s, but is " + "not boolean or tristate", sym->name, use); else if (sym2->type != S_UNKNOWN && sym2->type != S_BOOLEAN && sym2->type != S_TRISTATE) prop_warn(prop, - "'%s' has wrong type. 'select' only " + "'%s' has wrong type. '%s' only " "accept arguments of boolean and " - "tristate type", sym2->name); + "tristate type", sym2->name, use); break; case P_RANGE: if (sym->type != S_INT && sym->type != S_HEX) @@ -333,6 +337,10 @@ void menu_finalize(struct menu *parent) struct symbol *es = prop_get_symbol(prop); es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr, expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep))); + } else if (prop->type == P_IMPLY) { + struct symbol *es = prop_get_symbol(prop); + es->implied.expr = expr_alloc_or(es->implied.expr, + expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep))); } } } @@ -612,13 +620,30 @@ static struct property *get_symbol_prop(struct symbol *sym) return prop; } +static void get_symbol_props_str(struct gstr *r, struct symbol *sym, + enum prop_type tok, const char *prefix) +{ + bool hit = false; + struct property *prop; + + for_all_properties(sym, prop, tok) { + if (!hit) { + str_append(r, prefix); + hit = true; + } else + str_printf(r, " && "); + expr_gstr_print(prop->expr, r); + } + if (hit) + str_append(r, "\n"); +} + /* * head is optional and may be NULL */ static void get_symbol_str(struct gstr *r, struct symbol *sym, struct list_head *head) { - bool hit; struct property *prop; if (sym && sym->name) { @@ -648,22 +673,20 @@ static void get_symbol_str(struct gstr *r, struct symbol *sym, } } - hit = false; - for_all_properties(sym, prop, P_SELECT) { - if (!hit) { - str_append(r, " Selects: "); - hit = true; - } else - str_printf(r, " && "); - expr_gstr_print(prop->expr, r); - } - if (hit) - str_append(r, "\n"); + get_symbol_props_str(r, sym, P_SELECT, _(" Selects: ")); if (sym->rev_dep.expr) { str_append(r, _(" Selected by: ")); expr_gstr_print(sym->rev_dep.expr, r); str_append(r, "\n"); } + + get_symbol_props_str(r, sym, P_IMPLY, _(" Implies: ")); + if (sym->implied.expr) { + str_append(r, _(" Implied by: ")); + expr_gstr_print(sym->implied.expr, r); + str_append(r, "\n"); + } + str_append(r, "\n\n"); } diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c index 2432298487..074fb66d9a 100644 --- a/scripts/kconfig/symbol.c +++ b/scripts/kconfig/symbol.c @@ -258,6 +258,15 @@ static void sym_calc_visibility(struct symbol *sym) sym->rev_dep.tri = tri; sym_set_changed(sym); } + tri = no; + if (sym->implied.expr) + tri = expr_calc_value(sym->implied.expr); + if (tri == mod && sym_get_type(sym) == S_BOOLEAN) + tri = yes; + if (sym->implied.tri != tri) { + sym->implied.tri = tri; + sym_set_changed(sym); + } } /* @@ -397,6 +406,12 @@ void sym_calc_value(struct symbol *sym) newval.tri = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri); } + if (sym->dir_dep.tri != no && + sym->implied.tri != no) { + /* implied symbols have implied defaults */ + sym->flags |= SYMBOL_WRITE; + newval.tri = EXPR_OR(newval.tri, sym->implied.tri); + } } calc_newval: if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) { @@ -413,7 +428,8 @@ void sym_calc_value(struct symbol *sym) } newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri); } - if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN) + if (newval.tri == mod && + (sym_get_type(sym) == S_BOOLEAN || sym->implied.tri == yes)) newval.tri = yes; break; case S_STRING: @@ -498,6 +514,8 @@ bool sym_tristate_within_range(struct symbol *sym, tristate val) return false; if (sym->visible <= sym->rev_dep.tri) return false; + if (sym->implied.tri == yes && val == mod) + return false; if (sym_is_choice_value(sym) && sym->visible == yes) return val == yes; return val >= sym->rev_dep.tri && val <= sym->visible; @@ -750,6 +768,10 @@ const char *sym_get_string_default(struct symbol *sym) if (sym->type == S_BOOLEAN && val == mod) val = yes; + /* adjust the default value if this symbol is implied by another */ + if (val < sym->implied.tri) + val = sym->implied.tri; + switch (sym->type) { case S_BOOLEAN: case S_TRISTATE: @@ -1352,6 +1374,8 @@ const char *prop_get_type_name(enum prop_type type) return "choice"; case P_SELECT: return "select"; + case P_IMPLY: + return "imply"; case P_RANGE: return "range"; case P_SYMBOL: diff --git a/scripts/kconfig/zconf.gperf b/scripts/kconfig/zconf.gperf index ac498f01b4..ead02edec9 100644 --- a/scripts/kconfig/zconf.gperf +++ b/scripts/kconfig/zconf.gperf @@ -38,6 +38,7 @@ int, T_TYPE, TF_COMMAND, S_INT hex, T_TYPE, TF_COMMAND, S_HEX string, T_TYPE, TF_COMMAND, S_STRING select, T_SELECT, TF_COMMAND +imply, T_IMPLY, TF_COMMAND range, T_RANGE, TF_COMMAND visible, T_VISIBLE, TF_COMMAND option, T_OPTION, TF_COMMAND diff --git a/scripts/kconfig/zconf.y b/scripts/kconfig/zconf.y index 71bf8bff69..001305fa08 100644 --- a/scripts/kconfig/zconf.y +++ b/scripts/kconfig/zconf.y @@ -31,7 +31,7 @@ struct symbol *symbol_hash[SYMBOL_HASHSIZE]; static struct menu *current_menu, *current_entry; %} -%expect 30 +%expect 32 %union { @@ -62,6 +62,7 @@ static struct menu *current_menu, *current_entry; %token T_TYPE %token T_DEFAULT %token T_SELECT +%token T_IMPLY %token T_RANGE %token T_VISIBLE %token T_OPTION @@ -124,7 +125,7 @@ stmt_list: ; option_name: - T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_OPTIONAL | T_RANGE | T_DEFAULT | T_VISIBLE + T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_IMPLY | T_OPTIONAL | T_RANGE | T_DEFAULT | T_VISIBLE ; common_stmt: @@ -216,6 +217,12 @@ config_option: T_SELECT T_WORD if_expr T_EOL printd(DEBUG_PARSE, "%s:%d:select\n", zconf_curname(), zconf_lineno()); }; +config_option: T_IMPLY T_WORD if_expr T_EOL +{ + menu_add_symbol(P_IMPLY, sym_lookup($2, 0), $3); + printd(DEBUG_PARSE, "%s:%d:imply\n", zconf_curname(), zconf_lineno()); +}; + config_option: T_RANGE symbol symbol if_expr T_EOL { menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,$2, $3), $4); @@ -664,6 +671,11 @@ static void print_symbol(FILE *out, struct menu *menu) expr_fprint(prop->expr, out); fputc('\n', out); break; + case P_IMPLY: + fputs( " imply ", out); + expr_fprint(prop->expr, out); + fputc('\n', out); + break; case P_RANGE: fputs( " range ", out); expr_fprint(prop->expr, out); -- 2.7.4