Merge pull request torvalds#756 from ojeda/new-kallsyms-patches

kallsyms: provide a bigger buffer to report the real length

Author: ojeda

scripts/kallsyms.c

@@ -32,6 +32,13 @@
 
 #define KSYM_NAME_LEN		512
 
+/* A substantially bigger size than the current maximum. */
+#define KSYM_NAME_LEN_BUFFER   2048
+_Static_assert(
+	KSYM_NAME_LEN_BUFFER == KSYM_NAME_LEN * 4,
+	"Please keep KSYM_NAME_LEN_BUFFER in sync with KSYM_NAME_LEN"
+);
+
 struct sym_entry {
 	unsigned long long addr;
 	unsigned int len;
@@ -200,15 +207,15 @@ static void check_symbol_range(const char *sym, unsigned long long addr,
 
 static struct sym_entry *read_symbol(FILE *in)
 {
-	char name[KSYM_NAME_LEN+1], type;
+	char name[KSYM_NAME_LEN_BUFFER+1], type;
 	unsigned long long addr;
 	unsigned int len;
 	struct sym_entry *sym;
 	int rc;
 
-	rc = fscanf(in, "%llx %c %" _stringify(KSYM_NAME_LEN) "s\n", &addr, &type, name);
+	rc = fscanf(in, "%llx %c %" _stringify(KSYM_NAME_LEN_BUFFER) "s\n", &addr, &type, name);
 	if (rc != 3) {
-		if (rc != EOF && fgets(name, KSYM_NAME_LEN + 1, in) == NULL)
+		if (rc != EOF && fgets(name, KSYM_NAME_LEN_BUFFER + 1, in) == NULL)
 			fprintf(stderr, "Read error or end of file.\n");
 		return NULL;
 	}