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Date: Wed, 14 Apr 2010 15:22:24 +0200
From: Michal Marek <mmarek@...e.cz>
To: Aristeu Rozanski <aris@...hat.com>
Cc: Randy Dunlap <randy.dunlap@...cle.com>,
linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
davej@...hat.com, kyle@...hat.com, vgoyal@...hat.com,
arjan@...ux.intel.com
Subject: Re: [PATCH] kconfig: introduce nonint_oldconfig and loose_nonint_oldconfig
(v2)
On 13.4.2010 23:03, Aristeu Rozanski wrote:
> This patch has been around for a long time in Fedora and Red Hat Enterprise
> Linux kernels and it may be useful for others. The nonint_oldconfig target
> will fail and print the unset config options
Nice.
> while loose_nonint_oldconfig will simply let the config option unset.
So loose_nonint_oldconfig is just a less chatty version of
$ yes '' | make oldconfig
? Also, you should update make help.
> They're useful in distro kernel packages
> where the config files are built using a combination of smaller config files.
>
> Arjan van de Ven wrote the initial nonint_config and Roland McGrath added the
> loose_nonint_oldconfig.
>
> v2:
> - when -B and -b are used, return "2" so the reason can be distinguished from
> other errors
>
> Signed-off-by: Arjan van de Ven <arjan@...hat.com> [defunct email]
> Acked-by: Arjan van de Ven <arjan@...ux.intel.com>
> Acked-by: Randy Dunlap <randy.dunlap@...cle.com>
> Signed-off-by: Aristeu Rozanski <aris@...hat.com>
>
> --- linus-2.6.orig/scripts/kconfig/Makefile 2010-04-13 16:30:47.000000000 -0400
> +++ linus-2.6/scripts/kconfig/Makefile 2010-04-13 16:48:24.000000000 -0400
> @@ -69,6 +69,11 @@ localyesconfig: $(obj)/streamline_config
> fi
> $(Q)rm -f .tmp.config
>
> +nonint_oldconfig: $(obj)/conf
> + $< -b $(Kconfig)
> +loose_nonint_oldconfig: $(obj)/conf
> + $< -B $(Kconfig)
Add an empty line between the two rules.
> +
> # Create new linux.pot file
> # Adjust charset to UTF-8 in .po file to accept UTF-8 in Kconfig files
> # The symlink is used to repair a deficiency in arch/um
> --- linus-2.6.orig/scripts/kconfig/conf.c 2010-04-13 16:30:47.000000000 -0400
> +++ linus-2.6/scripts/kconfig/conf.c 2010-04-13 16:53:20.000000000 -0400
> @@ -16,6 +16,9 @@
> #define LKC_DIRECT_LINK
> #include "lkc.h"
>
> +/* Return codes */
> +#define EUNSETOPT 2 /* if -B is used and unset config options were found */
> +
> static void conf(struct menu *menu);
> static void check_conf(struct menu *menu);
>
> @@ -23,6 +26,8 @@ enum {
> ask_all,
> ask_new,
> ask_silent,
> + dont_ask,
> + dont_ask_dont_tell,
> set_default,
> set_yes,
> set_mod,
> @@ -360,7 +365,10 @@ static void conf(struct menu *menu)
>
> switch (prop->type) {
> case P_MENU:
> - if (input_mode == ask_silent && rootEntry != menu) {
> + if ((input_mode == ask_silent ||
> + input_mode == dont_ask ||
> + input_mode == dont_ask_dont_tell) &&
> + rootEntry != menu) {
> check_conf(menu);
> return;
> }
> @@ -406,6 +414,8 @@ conf_childs:
> indent -= 2;
> }
>
> +static int return_value;
> +
> static void check_conf(struct menu *menu)
> {
> struct symbol *sym;
> @@ -418,10 +428,19 @@ static void check_conf(struct menu *menu
> if (sym && !sym_has_value(sym)) {
> if (sym_is_changable(sym) ||
> (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes)) {
> - if (!conf_cnt++)
> - printf(_("*\n* Restart config...\n*\n"));
> - rootEntry = menu_get_parent_menu(menu);
> - conf(rootEntry);
> + if (input_mode == dont_ask ||
> + input_mode == dont_ask_dont_tell) {
> + if (input_mode == dont_ask &&
> + sym->name && !sym_is_choice_value(sym)) {
> + fprintf(stderr,"CONFIG_%s\n",sym->name);
You should print "The following variables are not set:" or something
like that before the first variable, otherwise it's not very clear what
the list means.
> + return_value = EUNSETOPT;
The name 'return_value' is a little confusing, we call exit(0) or
exit(1) at several places, but this variable only affects a single
statement. What about
static int unset_variables;
...
unset_variables++;
...
return unset_variables ? EUNSETOPT : 0;
? Also, define the static var at the beginning of the file, where the
remaining variables are defined.
> + }
> + } else {
> + if (!conf_cnt++)
> + printf(_("*\n* Restart config...\n*\n"));
> + rootEntry = menu_get_parent_menu(menu);
> + conf(rootEntry);
> + }
> }
> }
>
> @@ -439,7 +458,7 @@ int main(int ac, char **av)
> bindtextdomain(PACKAGE, LOCALEDIR);
> textdomain(PACKAGE);
>
> - while ((opt = getopt(ac, av, "osdD:nmyrh")) != -1) {
> + while ((opt = getopt(ac, av, "osbBdD:nmyrh")) != -1) {
> switch (opt) {
> case 'o':
> input_mode = ask_silent;
> @@ -448,6 +467,12 @@ int main(int ac, char **av)
> input_mode = ask_silent;
> sync_kconfig = 1;
> break;
> + case 'b':
> + input_mode = dont_ask;
> + break;
> + case 'B':
> + input_mode = dont_ask_dont_tell;
> + break;
> case 'd':
> input_mode = set_default;
> break;
> @@ -525,6 +550,8 @@ int main(int ac, char **av)
> case ask_silent:
> case ask_all:
> case ask_new:
> + case dont_ask:
> + case dont_ask_dont_tell:
> conf_read(NULL);
> break;
> case set_no:
> @@ -586,12 +613,16 @@ int main(int ac, char **av)
> conf(&rootmenu);
> input_mode = ask_silent;
> /* fall through */
> + case dont_ask:
> + case dont_ask_dont_tell:
> case ask_silent:
> /* Update until a loop caused no more changes */
> do {
> conf_cnt = 0;
> check_conf(&rootmenu);
> - } while (conf_cnt);
> + } while (conf_cnt &&
> + (input_mode != dont_ask &&
> + input_mode != dont_ask_dont_tell));
> break;
> }
>
> @@ -613,5 +644,5 @@ int main(int ac, char **av)
> exit(1);
> }
> }
> - return 0;
> + return return_value;
IMO nonint_oldconfig should not update the .config if it's going to
fail. At least I find this output quite confusing:
$ make nonint_oldconfig
scripts/kconfig/conf -b arch/x86/Kconfig
CONFIG_FOO
#
# configuration written to .config
#
make[1]: *** [nonint_oldconfig] Error 2
make: *** [nonint_oldconfig] Error 2
and a subsequent make nonint_oldconfig call does not fail.
Michal
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