[7/9] x86/intel_rdt: Fix incorrect loop end condition
diff mbox series

Message ID 1536957129-70380-8-git-send-email-fenghua.yu@intel.com
State Superseded
Headers show
  • x86/intel_rdt: MBA integration fixes
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Commit Message

Fenghua Yu Sept. 14, 2018, 8:32 p.m. UTC
From: Reinette Chatre <reinette.chatre@intel.com>

A loop is used to check if a CAT resource's CBM of one CLOSID
overlaps with the CBM of another CLOSID of the same resource. The loop
is run over all CLOSIDs supported by the resource.

The problem with running the loop over all CLOSIDs supported by the
resource is that its number of supported CLOSIDs may be more than the
number of supported CLOSIDs on the system, which is the minimum number of
CLOSIDs supported across all resources.

Fix the loop to only consider the number of system supported CLOSIDs,
not all that are supported by the resource.

Fixes: 49f7b4efa ("x86/intel_rdt: Enable setting of exclusive mode")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
 arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff mbox series

diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index 74821bc457c0..afd93d45e21b 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -996,7 +996,7 @@  bool rdtgroup_cbm_overlaps(struct rdt_resource *r, struct rdt_domain *d,
 	/* Check for overlap with other resource groups */
 	ctrl = d->ctrl_val;
-	for (i = 0; i < r->num_closid; i++, ctrl++) {
+	for (i = 0; i < closids_supported(); i++, ctrl++) {
 		ctrl_b = (unsigned long *)ctrl;
 		mode = rdtgroup_mode_by_closid(i);
 		if (closid_allocated(i) && i != closid &&