From: Fenghua Yu <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>, "H Peter Anvin" <hpa@zytor.com>,
"Tony Luck" <tony.luck@intel.com>
Cc: "Chatre, Reinette" <reinette.chatre@intel.com>,
"Xiaochen Shen" <xiaochen.shen@intel.com>,
"Chen Yu" <yu.c.chen@intel.com>,
"linux-kernel" <linux-kernel@vger.kernel.org>,
"x86" <x86@kernel.org>, "Fenghua Yu" <fenghua.yu@intel.com>
Subject: [PATCH 9/9] x86/intel_rdt: Fix incorrect loop end condition
Date: Fri, 14 Sep 2018 13:32:09 -0700 [thread overview]
Message-ID: <1536957129-70380-10-git-send-email-fenghua.yu@intel.com> (raw)
In-Reply-To: <1536957129-70380-1-git-send-email-fenghua.yu@intel.com>
From: Reinette Chatre <reinette.chatre@intel.com>
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>
---
arch/x86/kernel/cpu/intel_rdt_rdtgroup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
index fac99f81d02f..90b76c1ebd70 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -2370,7 +2370,7 @@ static int rdtgroup_init_alloc(struct rdtgroup *rdtgrp)
d->new_ctrl = r->cache.shareable_bits;
used_b = r->cache.shareable_bits;
ctrl = d->ctrl_val;
- for (i = 0; i < r->num_closid; i++, ctrl++) {
+ for (i = 0; i < closids_supported(); i++, ctrl++) {
if (closid_allocated(i) && i != closid) {
mode = rdtgroup_mode_by_closid(i);
if (mode == RDT_MODE_PSEUDO_LOCKSETUP)
--
2.19.0
prev parent reply other threads:[~2018-09-14 20:35 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-14 20:32 [PATCH 0/9] x86/intel_rdt: MBA integration fixes Fenghua Yu
2018-09-14 20:32 ` [PATCH 1/9] x86/intel_rdt: Fix MBA parsing callback Fenghua Yu
2018-09-15 10:13 ` Thomas Gleixner
2018-09-15 22:27 ` Fenghua Yu
2018-09-14 20:32 ` [PATCH 2/9] x86/intel_rdt: Fix size reporting of MBA resource Fenghua Yu
2018-09-14 20:32 ` [PATCH 3/9] x86/intel_rdt: Global closid helper to support future fixes Fenghua Yu
2018-09-14 20:32 ` [PATCH 4/9] x86/intel_rdt: Fix invalid mode warning when Fenghua Yu
2018-09-15 4:36 ` Reinette Chatre
2018-09-15 4:47 ` Reinette Chatre
2018-09-15 10:22 ` Thomas Gleixner
2018-09-14 20:32 ` [PATCH 5/9] x86/intel_rdt: Fix unchecked MSR access Fenghua Yu
2018-09-14 20:32 ` [PATCH 6/9] x86/intel_rdt: Do not allow pseudo-locking of MBA resource Fenghua Yu
2018-09-14 20:32 ` [PATCH 7/9] x86/intel_rdt: Fix incorrect loop end condition Fenghua Yu
2018-09-14 20:32 ` [PATCH 8/9] x86/intel_rdt: Fix exclusive mode handling of MBA resource Fenghua Yu
2018-09-14 20:32 ` Fenghua Yu [this message]
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