x86/intel_rdt: Fix incorrect loop end condition
authorReinette Chatre <reinette.chatre@intel.com>
Sat, 15 Sep 2018 21:58:27 +0000 (14:58 -0700)
committerThomas Gleixner <tglx@linutronix.de>
Tue, 18 Sep 2018 21:38:07 +0000 (23:38 +0200)
commitffb2315fd22c2568747402eecdc581a245a2f5ba
tree15f78db3584dba572528a4005d26487a4c4ff373
parent939b90b20bc87e199b6b53942764b987289b87ce
x86/intel_rdt: Fix incorrect loop end condition

In order to determine a sane default cache allocation for a new CAT/CDP
resource group, all resource groups are checked to determine which cache
portions are available to share. At this time all possible CLOSIDs
that can be supported by the resource is checked. This is problematic
if the resource supports more CLOSIDs than another CAT/CDP resource. In
this case, the number of CLOSIDs that could be allocated are fewer than
the number of CLOSIDs that can be supported by the resource.

Limit the check of closids to that what is supported by the system based
on the minimum across all resources.

Fixes: 95f0b77ef ("x86/intel_rdt: Initialize new resource group with sane defaults")
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: "H Peter Anvin" <hpa@zytor.com>
Cc: "Tony Luck" <tony.luck@intel.com>
Cc: "Xiaochen Shen" <xiaochen.shen@intel.com>
Cc: "Chen Yu" <yu.c.chen@intel.com>
Link: https://lkml.kernel.org/r/1537048707-76280-10-git-send-email-fenghua.yu@intel.com
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c