selftests/resctrl: Use correct type for pids

A few functions receive PIDs through int arguments. PIDs variables
should be of type pid_t, not int.

Convert pid arguments from int to pid_t.

Before printing PID, match the type to %d by casting to int which is
enough for Linux (standard would allow using a longer integer type but
generalizing for that would complicate the code unnecessarily, the
selftest code does not need to be portable).

Signed-off-by: Ilpo Järvinen <[e-mail]>
Tested-by: Babu Moger <[e-mail]>
Reviewed-by: Reinette Chatre <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/testing/selftests/resctrl/cache.c

···
  *
  * Return:		0 on success, < 0 on error.
  */
-static int print_results_cache(const char *filename, int bm_pid, __u64 llc_value)
+static int print_results_cache(const char *filename, pid_t bm_pid, __u64 llc_value)
 {
 	FILE *fp;
 
 	if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) {
-		printf("Pid: %d \t LLC_value: %llu\n", bm_pid, llc_value);
+		printf("Pid: %d \t LLC_value: %llu\n", (int)bm_pid, llc_value);
 	} else {
 		fp = fopen(filename, "a");
 		if (!fp) {
···
 
 			return -1;
 		}
-		fprintf(fp, "Pid: %d \t llc_value: %llu\n", bm_pid, llc_value);
+		fprintf(fp, "Pid: %d \t llc_value: %llu\n", (int)bm_pid, llc_value);
 		fclose(fp);
 	}
 
···
  * Return: =0 on success. <0 on failure.
  */
 int perf_event_measure(int pe_fd, struct perf_event_read *pe_read,
-		       const char *filename, int bm_pid)
+		       const char *filename, pid_t bm_pid)
 {
 	int ret;
 
···
  *
  * Return: =0 on success. <0 on failure.
  */
-int measure_llc_resctrl(const char *filename, int bm_pid)
+int measure_llc_resctrl(const char *filename, pid_t bm_pid)
 {
 	unsigned long llc_occu_resc = 0;
 	int ret;

tools/testing/selftests/resctrl/resctrl.h

···
 int perf_open(struct perf_event_attr *pea, pid_t pid, int cpu_no);
 int perf_event_reset_enable(int pe_fd);
 int perf_event_measure(int pe_fd, struct perf_event_read *pe_read,
-		       const char *filename, int bm_pid);
-int measure_llc_resctrl(const char *filename, int bm_pid);
+		       const char *filename, pid_t bm_pid);
+int measure_llc_resctrl(const char *filename, pid_t bm_pid);
 void show_cache_info(int no_of_bits, __u64 avg_llc_val, size_t cache_span, bool lines);
 
 /*

tools/testing/selftests/resctrl/resctrl_val.c

···
  *
  * Return:		0 on success, < 0 on error.
  */
-static int print_results_bw(char *filename,  int bm_pid, float bw_imc,
+static int print_results_bw(char *filename, pid_t bm_pid, float bw_imc,
 			    unsigned long bw_resc)
 {
 	unsigned long diff = fabs(bw_imc - bw_resc);
 	FILE *fp;
 
 	if (strcmp(filename, "stdio") == 0 || strcmp(filename, "stderr") == 0) {
-		printf("Pid: %d \t Mem_BW_iMC: %f \t ", bm_pid, bw_imc);
+		printf("Pid: %d \t Mem_BW_iMC: %f \t ", (int)bm_pid, bw_imc);
 		printf("Mem_BW_resc: %lu \t Difference: %lu\n", bw_resc, diff);
 	} else {
 		fp = fopen(filename, "a");
···
 			return -1;
 		}
 		if (fprintf(fp, "Pid: %d \t Mem_BW_iMC: %f \t Mem_BW_resc: %lu \t Difference: %lu\n",
-			    bm_pid, bw_imc, bw_resc, diff) <= 0) {
+			    (int)bm_pid, bw_imc, bw_resc, diff) <= 0) {
 			ksft_print_msg("Could not log results\n");
 			fclose(fp);
 
···
 		PARENT_EXIT();
 	}
 
-	ksft_print_msg("Benchmark PID: %d\n", bm_pid);
+	ksft_print_msg("Benchmark PID: %d\n", (int)bm_pid);
 
 	/*
 	 * The cast removes constness but nothing mutates benchmark_cmd within

tools/testing/selftests/resctrl/resctrlfs.c

···
 
 		return -1;
 	}
-	if (fprintf(fp, "%d\n", pid) < 0) {
+	if (fprintf(fp, "%d\n", (int)pid) < 0) {
 		ksft_print_msg("Failed to write pid to tasks file\n");
 		fclose(fp);