--- zzzz-none-000/linux-3.10.107/Documentation/prctl/disable-tsc-test.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/prctl/disable-tsc-test.c	2021-02-04 17:41:59.000000000 +0000
@@ -29,14 +29,15 @@
 	[PR_TSC_SIGSEGV] = "PR_TSC_SIGSEGV",
 };
 
-uint64_t rdtsc() {
+static uint64_t rdtsc(void)
+{
 uint32_t lo, hi;
 /* We cannot use "=A", since this would use %rax on x86_64 */
 __asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
 return (uint64_t)hi << 32 | lo;
 }
 
-void sigsegv_cb(int sig)
+static void sigsegv_cb(int sig)
 {
 	int tsc_val = 0;