The struct resctrl_val_param has control and monitor groups as char
arrays but they are not supposed to be mutated within resctrl_val().
Convert the ctrlgrp and mongrp char array within resctrl_val_param to
plain const char pointers and adjust the strlen() based checks to
check NULL instead.
Signed-off-by: Ilpo Järvinen <[email protected]>
Tested-by: Babu Moger <[email protected]>
Reviewed-by: Reinette Chatre <[email protected]>
---
v6:
- Language tweak into kerneldoc
- Removed stale paragraph from commit message
v5:
- Return 0 if grp_name is null (restore earlier behavior)
- Move the root group note from comment into kerneldoc
v3:
- Removed wrong comment
- Changed grp_name check to return -1 on fail (internal sanity check)
---
tools/testing/selftests/resctrl/resctrl.h | 4 ++--
tools/testing/selftests/resctrl/resctrlfs.c | 16 +++++++---------
2 files changed, 9 insertions(+), 11 deletions(-)
diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
index 5967389038d4..a999fbc13fd3 100644
--- a/tools/testing/selftests/resctrl/resctrl.h
+++ b/tools/testing/selftests/resctrl/resctrl.h
@@ -91,8 +91,8 @@ struct resctrl_test {
*/
struct resctrl_val_param {
char *resctrl_val;
- char ctrlgrp[64];
- char mongrp[64];
+ const char *ctrlgrp;
+ const char *mongrp;
char filename[64];
unsigned long mask;
int num_of_runs;
diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
index f4dc8ef23a8c..e2d1ecb55d51 100644
--- a/tools/testing/selftests/resctrl/resctrlfs.c
+++ b/tools/testing/selftests/resctrl/resctrlfs.c
@@ -456,6 +456,9 @@ int taskset_restore(pid_t bm_pid, cpu_set_t *old_affinity)
* @grp: Full path and name of the group
* @parent_grp: Full path and name of the parent group
*
+ * Creates a group @grp_name if it does not exist yet. If @grp_name is NULL,
+ * it is interpreted as the root group which always results in success.
+ *
* Return: 0 on success, < 0 on error.
*/
static int create_grp(const char *grp_name, char *grp, const char *parent_grp)
@@ -464,12 +467,7 @@ static int create_grp(const char *grp_name, char *grp, const char *parent_grp)
struct dirent *ep;
DIR *dp;
- /*
- * At this point, we are guaranteed to have resctrl FS mounted and if
- * length of grp_name == 0, it means, user wants to use root con_mon
- * grp, so do nothing
- */
- if (strlen(grp_name) == 0)
+ if (!grp_name)
return 0;
/* Check if requested grp exists or not */
@@ -541,7 +539,7 @@ int write_bm_pid_to_resctrl(pid_t bm_pid, const char *ctrlgrp,
char tasks[1024];
int ret = 0;
- if (strlen(ctrlgrp))
+ if (ctrlgrp)
sprintf(controlgroup, "%s/%s", RESCTRL_PATH, ctrlgrp);
else
sprintf(controlgroup, "%s", RESCTRL_PATH);
@@ -558,7 +556,7 @@ int write_bm_pid_to_resctrl(pid_t bm_pid, const char *ctrlgrp,
/* Create mon grp and write pid into it for "mbm" and "cmt" test */
if (!strncmp(resctrl_val, CMT_STR, sizeof(CMT_STR)) ||
!strncmp(resctrl_val, MBM_STR, sizeof(MBM_STR))) {
- if (strlen(mongrp)) {
+ if (mongrp) {
sprintf(monitorgroup_p, "%s/mon_groups", controlgroup);
sprintf(monitorgroup, "%s/%s", monitorgroup_p, mongrp);
ret = create_grp(mongrp, monitorgroup, monitorgroup_p);
@@ -612,7 +610,7 @@ int write_schemata(const char *ctrlgrp, char *schemata, int cpu_no,
goto out;
}
- if (strlen(ctrlgrp) != 0)
+ if (ctrlgrp)
sprintf(controlgroup, "%s/%s/schemata", RESCTRL_PATH, ctrlgrp);
else
sprintf(controlgroup, "%s/schemata", RESCTRL_PATH);
--
2.39.2