Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
kconfig: cache expression values
Cache expression values to avoid recalculating them repeatedly.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
+39
-4
+2
scripts/kconfig/confdata.c
+2
scripts/kconfig/confdata.c
+30
-4
scripts/kconfig/expr.c
+30
-4
scripts/kconfig/expr.c
···
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? kind : k_string;
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}
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-
tristate expr_calc_value(struct expr *e)
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+
static tristate __expr_calc_value(struct expr *e)
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{
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tristate val1, val2;
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const char *str1, *str2;
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enum string_value_kind k1 = k_string, k2 = k_string;
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union string_value lval = {}, rval = {};
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int res;
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-
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-
if (!e)
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return yes;
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switch (e->type) {
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case E_SYMBOL:
···
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printf("expr_calc_value: relation %d?\n", e->type);
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return no;
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}
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+
}
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+
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/**
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* expr_calc_value - return the tristate value of the given expression
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* @e: expression
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* return: tristate value of the expression
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+
*/
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+
tristate expr_calc_value(struct expr *e)
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+
{
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+
if (!e)
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return yes;
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+
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if (!e->val_is_valid) {
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+
e->val = __expr_calc_value(e);
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e->val_is_valid = true;
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+
}
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+
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+
return e->val;
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+
}
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+
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+
/**
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* expr_invalidate_all - invalidate all cached expression values
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+
*/
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+
void expr_invalidate_all(void)
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+
{
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struct expr *e;
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+
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hash_for_each(expr_hashtable, e, node)
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+
e->val_is_valid = false;
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}
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static int expr_compare_type(enum expr_type t1, enum expr_type t2)
+4
scripts/kconfig/expr.h
+4
scripts/kconfig/expr.h
···
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*
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* @node: link node for the hash table
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* @type: expressoin type
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+
* @val: calculated tristate value
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* @val_is_valid: indicate whether the value is valid
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* @left: left node
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* @right: right node
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*/
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struct expr {
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struct hlist_node node;
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enum expr_type type;
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+
tristate val;
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+
bool val_is_valid;
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union expr_data left, right;
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};
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+2
scripts/kconfig/internal.h
+2
scripts/kconfig/internal.h