From: Wang Hui <>

If no monitoring feature is detected because all monitoring features are
disabled during boot time or there is no monitoring feature in hardware,
creating rdtgroup sub-directory by "mkdir" command reports error:

#mkdir /sys/fs/resctrl/p1
mkdir: cannot create directory ‘/sys/fs/resctrl/p1’: No such file or

But the sub-directory actually is generated and content is correct:

#ls /sys/fs/resctrl/p1
cpus  cpus_list  schemata  tasks

The error is because rdtgroup_mkdir_ctrl_mon() returns non zero value after
the sub-directory is created and the returned value is reported as an error
to user.

Clear the returned value to report to user that the sub-directory is
actually created successfully.

Signed-off-by: Wang Hui <>
Signed-off-by: Zhang Yanfei <>
Signed-off-by: Fenghua Yu <>
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c 
index bdab7d2f51af..fca759d272a1 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -1804,6 +1804,7 @@ static int rdtgroup_mkdir_ctrl_mon(struct kernfs_node 
                goto out_common_fail;
        closid = ret;
+       ret = 0;
        rdtgrp->closid = closid;
        list_add(&rdtgrp->rdtgroup_list, &rdt_all_groups);

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