linux-kernel - [PATCH 1/2] x86/intel_rdt: Fix setting of closid when adding CPUs to a group

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Date:   Fri, 18 Nov 2016 15:18:03 -0800
From:   "Fenghua Yu" <fenghua.yu@...el.com>
To:     "Thomas Gleixner" <tglx@...utronix.de>
Cc:     "H. Peter Anvin" <h.peter.anvin@...el.com>,
        "Ingo Molnar" <mingo@...e.hu>, "Tony Luck" <tony.luck@...el.com>,
        "Ravi V Shankar" <ravi.v.shankar@...el.com>,
        "Sai Prakhya" <sai.praneeth.prakhya@...el.com>,
        "Vikas Shivappa" <vikas.shivappa@...ux.intel.com>,
        "linux-kernel" <linux-kernel@...r.kernel.org>,
        "x86" <x86@...nel.org>, "Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH 1/2] x86/intel_rdt: Fix setting of closid when adding CPUs to a group

From: Fenghua Yu <fenghua.yu@...el.com>

There was a cut & paste error when adding code to update the per-cpu
closid when changing the bitmask of CPUs to an rdt group. CPUs removed
from the group were correctly given back to the default group. But
CPUs added to the group should be given the closid of their new group,
not the default group closid.

Fixes: f410770293a1 ("x86/intel_rdt: Update percpu closid immeditately
on CPUs affected by changee")

Signed-off-by: Fenghua Yu <fenghua.yu@...el.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 98edba4..eccea8a 100644
--- a/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
+++ b/arch/x86/kernel/cpu/intel_rdt_rdtgroup.c
@@ -278,7 +278,7 @@ static ssize_t rdtgroup_cpus_write(struct kernfs_open_file *of,
 				continue;
 			cpumask_andnot(&r->cpu_mask, &r->cpu_mask, tmpmask);
 		}
-		rdt_update_percpu_closid(tmpmask, rdtgroup_default.closid);
+		rdt_update_percpu_closid(tmpmask, rdtgrp->closid);
 	}
 
 	/* Done pushing/pulling - update this group with new mask */
-- 
2.5.0