Messages in this thread | | | From | Masahiro Yamada <> | Date | Wed, 17 Jan 2018 01:47:58 +0900 | Subject | Re: [PATCH 3/6] kconfig: do not call conf_set_all_new_symbols() for (all)defconfig |
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Hi Ulf,
2018-01-12 23:28 GMT+09:00 Ulf Magnusson <ulfalizer@gmail.com>: > On Wed, Jan 10, 2018 at 7:56 AM, Masahiro Yamada > <yamada.masahiro@socionext.com> wrote: >> (all)defconfig does not need to call conf_set_all_new_symbols() because >> conf_write() calculates all symbols based on their default unless they >> have been user-defined. >> >> conf_set_all_new_symbols(def_default) is no-op except for "choice". >> It calls sym_cal_value() for "choice", but the SYMBOL_VALID is cleared >> by set_all_choice_values() later on. So, conf_write() will re-calculate >> it, which is just a wasteful computation. The only difference I see >> is SYMBOL_DEF_USER flag for "choice", but it gives no difference to the >> resulted .config file. >> >> I confirmed this change still produced the same .config for all ARCH. >> >> I also moved savedefconfig to collect the no-op cases at the end of >> the switch statement. >> >> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> >> --- >> >> scripts/kconfig/conf.c | 11 +++-------- >> 1 file changed, 3 insertions(+), 8 deletions(-) >> >> diff --git a/scripts/kconfig/conf.c b/scripts/kconfig/conf.c >> index 52cbe5d..8364811 100644 >> --- a/scripts/kconfig/conf.c >> +++ b/scripts/kconfig/conf.c >> @@ -655,18 +655,10 @@ int main(int ac, char **av) >> case allmodconfig: >> conf_set_all_new_symbols(def_mod); >> break; >> - case alldefconfig: >> - conf_set_all_new_symbols(def_default); >> - break; >> case randconfig: >> /* Really nothing to do in this loop */ >> while (conf_set_all_new_symbols(def_random)) ; >> break; >> - case defconfig: >> - conf_set_all_new_symbols(def_default); >> - break; >> - case savedefconfig: >> - break; >> case oldaskconfig: >> rootEntry = &rootmenu; >> conf(&rootmenu); >> @@ -681,7 +673,10 @@ int main(int ac, char **av) >> check_conf(&rootmenu); >> } while (conf_cnt && input_mode != listnewconfig); >> break; >> + case alldefconfig: >> + case defconfig: >> case olddefconfig: >> + case savedefconfig: >> default: >> break; >> } >> -- >> 2.7.4 >> > > Another side effect of conf_set_all_new_symbols(def_default) is that > SYMBOL_NEED_SET_CHOICE_VALUES is set on all choice values. Might want > to check fbe98bb9ed3d ("kconfig: Fix defconfig when one choice menu > selects options that another choice menu depends on") to make sure > nothing breaks related to that. > > Cheers, > Ulf > --
Thanks for your comments!
From a quick test, this patch seems OK, but I need to take a closer look at this.
-- Best Regards Masahiro Yamada
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