[tip:x86/cache] x86/intel_rdt/cqm: Clear the default RMID during hotcpu

[tip-bot for Vikas Shivappa]

Commit-ID:  eda61c265f3656be8345fdf0334b3a77829437fc
Gitweb:     http://git.kernel.org/tip/eda61c265f3656be8345fdf0334b3a77829437fc
Author:     Vikas Shivappa <vikas.shivappa@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 9 Aug 2017 11:46:33 -0700
Committer:  Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 14 Aug 2017 11:47:46 +0200

x86/intel_rdt/cqm: Clear the default RMID during hotcpu

The user configured per cpu default RMID is not cleared during cpu
hotplug. This may lead to incorrect RMID values after a cpu goes offline
and again comes back online. Clear the per cpu default RMID during cpu
offline and online handling.

Reported-by: Prakyha Sai Praneeth <sai.praneeth.prakhya@xxxxxxxxx>
Signed-off-by: Vikas Shivappa <vikas.shivappa@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: ravi.v.shankar@xxxxxxxxx
Cc: tony.luck@xxxxxxxxx
Cc: fenghua.yu@xxxxxxxxx
Cc: peterz@xxxxxxxxxxxxx
Cc: eranian@xxxxxxxxxx
Cc: ak@xxxxxxxxxxxxxxx
Cc: davidcc@xxxxxxxxxx
Link: http://lkml.kernel.org/r/1502304395-7166-2-git-send-email-vikas.shivappa@xxxxxxxxxxxxxxx

---
 arch/x86/kernel/cpu/intel_rdt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/intel_rdt.c b/arch/x86/kernel/cpu/intel_rdt.c
index da4f389..4b9edb2 100644
--- a/arch/x86/kernel/cpu/intel_rdt.c
+++ b/arch/x86/kernel/cpu/intel_rdt.c
@@ -551,6 +551,7 @@ static void clear_closid_rmid(int cpu)
 	struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
 
 	per_cpu(rdt_cpu_default.closid, cpu) = 0;
+	per_cpu(rdt_cpu_default.rmid, cpu) = 0;
 	state->closid = 0;
 	state->rmid = 0;
 	wrmsr(IA32_PQR_ASSOC, 0, 0);