--- zzzz-none-000/linux-3.10.107/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c	2021-02-04 17:41:59.000000000 +0000
@@ -27,19 +27,20 @@
 # define PR_TSC_SIGSEGV		2   /* throw a SIGSEGV instead of reading the TSC */
 #endif
 
-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_expect(int sig)
+static void sigsegv_expect(int sig)
 {
 	/* */
 }
 
-void segvtask(void)
+static void segvtask(void)
 {
 	if (prctl(PR_SET_TSC, PR_TSC_SIGSEGV) < 0)
 	{
@@ -54,13 +55,13 @@
 }
 
 
-void sigsegv_fail(int sig)
+static void sigsegv_fail(int sig)
 {
 	fprintf(stderr, "FATAL ERROR, rdtsc() failed while enabled\n");
 	exit(0);
 }
 
-void rdtsctask(void)
+static void rdtsctask(void)
 {
 	if (prctl(PR_SET_TSC, PR_TSC_ENABLE) < 0)
 	{