lkmc_vector_equal into lkmc.c

Document lkmc.c

lkmc.c

@@ -1,3 +1,6 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#lkmc-c */
+
+#include <math.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -9,8 +12,21 @@ void lkmc_assert(bool condition) {
 }
 
 void lkmc_assert_fail() {
-	puts("lkmc_test_fail");
-	exit(1);
+    puts("lkmc_test_fail");
+    exit(1);
+}
+
+bool lkmc_vector_equal(size_t n, double *v1, double *v2, double max_err) {
+    double sum = 0.0;
+    double diff;
+    size_t i;
+    for (i = 0; i < n; ++i) {
+        diff = v1[i] - v2[i];
+        sum += diff * diff;
+    }
+    if (sqrt(sum)/n > max_err)
+        return false;
+    return true;
 }
 
 #if defined(__aarch64__)