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authorFenghua Yu <fenghua.yu@intel.com>2021-03-17 02:22:54 +0000
committerShuah Khan <skhan@linuxfoundation.org>2021-04-02 13:58:37 -0600
commit1205b688c92558a04d8dd4cbc2b213e0fceba5db (patch)
tree7fb102a5a1927899dd66f8e6ac11b97e762ae2e5
parentd81343b5eedf84be71a4313e8fd073d0c510afcf (diff)
downloadstable-1205b688c92558a04d8dd4cbc2b213e0fceba5db.tar.gz
stable-1205b688c92558a04d8dd4cbc2b213e0fceba5db.tar.xz
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selftests/resctrl: Fix checking for < 0 for unsigned values
Dan reported following static checker warnings tools/testing/selftests/resctrl/resctrl_val.c:545 measure_vals() warn: 'bw_imc' unsigned <= 0 tools/testing/selftests/resctrl/resctrl_val.c:549 measure_vals() warn: 'bw_resc_end' unsigned <= 0 These warnings are reported because 1. measure_vals() declares 'bw_imc' and 'bw_resc_end' as unsigned long variables 2. Return value of get_mem_bw_imc() and get_mem_bw_resctrl() are assigned to 'bw_imc' and 'bw_resc_end' respectively 3. The returned values are checked for <= 0 to see if the calls failed Checking for < 0 for an unsigned value doesn't make any sense. Fix this issue by changing the implementation of get_mem_bw_imc() and get_mem_bw_resctrl() such that they now accept reference to a variable and set the variable appropriately upon success and return 0, else return < 0 on error. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Tested-by: Babu Moger <babu.moger@amd.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
-rw-r--r--tools/testing/selftests/resctrl/resctrl_val.c41
1 files changed, 23 insertions, 18 deletions
diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
index 20d457c47ded..95224345c78e 100644
--- a/tools/testing/selftests/resctrl/resctrl_val.c
+++ b/tools/testing/selftests/resctrl/resctrl_val.c
@@ -300,9 +300,9 @@ static int initialize_mem_bw_imc(void)
* Memory B/W utilized by a process on a socket can be calculated using
* iMC counters. Perf events are used to read these counters.
*
- * Return: >= 0 on success. < 0 on failure.
+ * Return: = 0 on success. < 0 on failure.
*/
-static float get_mem_bw_imc(int cpu_no, char *bw_report)
+static int get_mem_bw_imc(int cpu_no, char *bw_report, float *bw_imc)
{
float reads, writes, of_mul_read, of_mul_write;
int imc, j, ret;
@@ -373,13 +373,18 @@ static float get_mem_bw_imc(int cpu_no, char *bw_report)
close(imc_counters_config[imc][WRITE].fd);
}
- if (strcmp(bw_report, "reads") == 0)
- return reads;
+ if (strcmp(bw_report, "reads") == 0) {
+ *bw_imc = reads;
+ return 0;
+ }
- if (strcmp(bw_report, "writes") == 0)
- return writes;
+ if (strcmp(bw_report, "writes") == 0) {
+ *bw_imc = writes;
+ return 0;
+ }
- return (reads + writes);
+ *bw_imc = reads + writes;
+ return 0;
}
void set_mbm_path(const char *ctrlgrp, const char *mongrp, int resource_id)
@@ -438,9 +443,8 @@ static void initialize_mem_bw_resctrl(const char *ctrlgrp, const char *mongrp,
* 1. If con_mon grp is given, then read from it
* 2. If con_mon grp is not given, then read from root con_mon grp
*/
-static unsigned long get_mem_bw_resctrl(void)
+static int get_mem_bw_resctrl(unsigned long *mbm_total)
{
- unsigned long mbm_total = 0;
FILE *fp;
fp = fopen(mbm_total_path, "r");
@@ -449,7 +453,7 @@ static unsigned long get_mem_bw_resctrl(void)
return -1;
}
- if (fscanf(fp, "%lu", &mbm_total) <= 0) {
+ if (fscanf(fp, "%lu", mbm_total) <= 0) {
perror("Could not get mbm local bytes");
fclose(fp);
@@ -457,7 +461,7 @@ static unsigned long get_mem_bw_resctrl(void)
}
fclose(fp);
- return mbm_total;
+ return 0;
}
pid_t bm_pid, ppid;
@@ -549,7 +553,8 @@ static void initialize_llc_occu_resctrl(const char *ctrlgrp, const char *mongrp,
static int
measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start)
{
- unsigned long bw_imc, bw_resc, bw_resc_end;
+ unsigned long bw_resc, bw_resc_end;
+ float bw_imc;
int ret;
/*
@@ -559,13 +564,13 @@ measure_vals(struct resctrl_val_param *param, unsigned long *bw_resc_start)
* Compare the two values to validate resctrl value.
* It takes 1sec to measure the data.
*/
- bw_imc = get_mem_bw_imc(param->cpu_no, param->bw_report);
- if (bw_imc <= 0)
- return bw_imc;
+ ret = get_mem_bw_imc(param->cpu_no, param->bw_report, &bw_imc);
+ if (ret < 0)
+ return ret;
- bw_resc_end = get_mem_bw_resctrl();
- if (bw_resc_end <= 0)
- return bw_resc_end;
+ ret = get_mem_bw_resctrl(&bw_resc_end);
+ if (ret < 0)
+ return ret;
bw_resc = (bw_resc_end - *bw_resc_start) / MB;
ret = print_results_bw(param->filename, bm_pid, bw_imc, bw_resc);