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kconfig: remove S_OTHER symbol type and correct dependency tracking 

The S_OTHER type could be set only when conf_read_simple() is reading
include/config/auto.conf file.

For example, CONFIG_FOO=y exists in include/config/auto.conf but it is
missing from the currently parsed Kconfig files, sym_lookup() allocates
a new symbol, and sets its type to S_OTHER.

Strangely, it will be set to S_STRING by conf_set_sym_val() a few lines
below while it is obviously bool or tristate type. On the other hand,
when CONFIG_BAR="bar" is being dropped from include/config/auto.conf,
its type remains S_OTHER. Because for_all_symbols() omits S_OTHER
symbols, conf_touch_deps() misses to touch include/config/bar.h

This behavior has been a pretty mystery for me, and digging the git
histroy did not help. At least, touching depfiles is broken for string
type symbols.

I removed S_OTHER entirely, and reimplemented it more simply.

If CONFIG_FOO was visible in the previous syncconfig, but is missing
now, what we want to do is quite simple; just call conf_touch_dep()
to touch include/config/foo.h instead of allocating a new symbol data.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada 2018-11-30 18:15:51 +09:00
parent 1508fec82e
commit 2aabbed677
3 changed files with 16 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
scripts/kconfig/confdata.c
View File

@ -227,14 +227,6 @@ static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
conf_warning("symbol value '%s' invalid for %s",
p, sym->name);
return 1;
case S_OTHER:
if (*p != '"') {
for (p2 = p; *p2 && !isspace(*p2); p2++)
;
sym->type = S_STRING;
goto done;
}
/* fall through */
case S_STRING:
if (*p++ != '"')
break;
@ -253,7 +245,6 @@ static int conf_set_sym_val(struct symbol *sym, int def, int def_flags, char *p)
/* fall through */
case S_INT:
case S_HEX:
done:
if (sym_string_valid(sym, p)) {
sym->def[def].val = xstrdup(p);
sym->flags |= def_flags;
@ -434,17 +425,22 @@ int conf_read_simple(const char *name, int def)
if (*p2 == '\r')
*p2 = 0;
}
if (def == S_DEF_USER) {
sym = sym_find(line + strlen(CONFIG_));
if (!sym) {
sym = sym_find(line + strlen(CONFIG_));
if (!sym) {
if (def == S_DEF_AUTO)
/*
* Reading from include/config/auto.conf
* If CONFIG_FOO previously existed in
* auto.conf but it is missing now,
* include/config/foo.h must be touched.
*/
conf_touch_dep(line + strlen(CONFIG_));
else
sym_add_change_count(1);
continue;
}
} else {
sym = sym_lookup(line + strlen(CONFIG_), 0);
if (sym->type == S_UNKNOWN)
sym->type = S_OTHER;
continue;
}
if (sym->flags & def_flags) {
conf_warning("override: reassigning to symbol %s", sym->name);
}
@ -710,7 +706,6 @@ static void conf_write_symbol(FILE *fp, struct symbol *sym,
const char *str;
switch (sym->type) {
case S_OTHER:
case S_UNKNOWN:
break;
case S_STRING:

4
scripts/kconfig/expr.h
View File

@ -62,7 +62,7 @@ struct symbol_value {
};
enum symbol_type {
S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING, S_OTHER
S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING
};
/* enum values are used as index to symbol.def[] */
@ -131,7 +131,7 @@ struct symbol {
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)
#define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next)
#define SYMBOL_CONST 0x0001 /* symbol is const */
#define SYMBOL_CHECK 0x0008 /* used during dependency checking */

3
scripts/kconfig/symbol.c
View File

@ -61,8 +61,6 @@ const char *sym_type_name(enum symbol_type type)
return "string";
case S_UNKNOWN:
return "unknown";
case S_OTHER:
break;
}
return "???";
}
@ -757,7 +755,6 @@ const char *sym_get_string_default(struct symbol *sym)
return str;
case S_STRING:
return str;
case S_OTHER:
case S_UNKNOWN:
break;
}