static int build_id_cache__add_kcore(const char *filename, bool force)
 {
-       char dir[32], sbuildid[BUILD_ID_SIZE * 2 + 1];
+       char dir[32], sbuildid[SBUILD_ID_SIZE];
        char from_dir[PATH_MAX], to_dir[PATH_MAX];
        char *p;
 
 
 static int build_id_cache__add_file(const char *filename)
 {
-       char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+       char sbuild_id[SBUILD_ID_SIZE];
        u8 build_id[BUILD_ID_SIZE];
        int err;
 
 static int build_id_cache__remove_file(const char *filename)
 {
        u8 build_id[BUILD_ID_SIZE];
-       char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+       char sbuild_id[SBUILD_ID_SIZE];
 
        int err;
 
 static int build_id_cache__update_file(const char *filename)
 {
        u8 build_id[BUILD_ID_SIZE];
-       char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+       char sbuild_id[SBUILD_ID_SIZE];
 
        int err = 0;
 
 
 static int sysfs__fprintf_build_id(FILE *fp)
 {
        u8 kallsyms_build_id[BUILD_ID_SIZE];
-       char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+       char sbuild_id[SBUILD_ID_SIZE];
 
        if (sysfs__read_build_id("/sys/kernel/notes", kallsyms_build_id,
                                 sizeof(kallsyms_build_id)) != 0)
 static int filename__fprintf_build_id(const char *name, FILE *fp)
 {
        u8 build_id[BUILD_ID_SIZE];
-       char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+       char sbuild_id[SBUILD_ID_SIZE];
 
        if (filename__read_build_id(name, build_id,
                                    sizeof(build_id)) != sizeof(build_id))
 
 
 char *dso__build_id_filename(const struct dso *dso, char *bf, size_t size)
 {
-       char build_id_hex[BUILD_ID_SIZE * 2 + 1];
+       char build_id_hex[SBUILD_ID_SIZE];
 
        if (!dso->has_build_id)
                return NULL;
                                 const char *name, bool is_kallsyms,
                                 bool is_vdso)
 {
-       char sbuild_id[BUILD_ID_SIZE * 2 + 1];
+       char sbuild_id[SBUILD_ID_SIZE];
 
        build_id__sprintf(build_id, build_id_size, sbuild_id);
 
 
 #ifndef PERF_BUILD_ID_H_
 #define PERF_BUILD_ID_H_ 1
 
-#define BUILD_ID_SIZE 20
+#define BUILD_ID_SIZE  20
+#define SBUILD_ID_SIZE (BUILD_ID_SIZE * 2 + 1)
 
 #include "tool.h"
 #include "strlist.h"