Commit-ID: 4a7a54a55e7237386cacc73f173e74329773ac93
Gitweb: https://git.kernel.org/tip/4a7a54a55e7237386cacc73f173e74329773ac93
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Fri, 3 Aug 2018 13:06:35 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Fri, 3 Aug 2018 13:06:35 +0200
x86/intel_rdt: Disable PMU access
Peter is objecting to the direct PMU access in RDT. Right now the PMU usage
is broken anyway as it is not coordinated with perf.
Until this discussion settled, disable the PMU mechanics by simply
rejecting the type '2' measurement in the resctrl file.
Reported-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Reinette Chatre <reinette.chatre@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: fenghua.yu@xxxxxxxxx
Cc: tony.luck@xxxxxxxxx
Cc: vikas.shivappa@xxxxxxxxxxxxxxx
CC: gavin.hindman@xxxxxxxxx
Cc: jithu.joseph@xxxxxxxxx
Cc: hpa@xxxxxxxxx
---
arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
index f80c58f8adc3..40f3903ae5d9 100644
--- a/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
+++ b/arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c
@@ -1171,7 +1171,7 @@ static ssize_t pseudo_lock_measure_trigger(struct file *file,
buf[buf_size] = '\0';
ret = kstrtoint(buf, 10, &sel);
if (ret == 0) {
- if (sel != 1 && sel != 2)
+ if (sel != 1)
return -EINVAL;
ret = debugfs_file_get(file->f_path.dentry);
if (ret)
--
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