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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-08-03 13:06:35 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-08-03 13:06:35 +0200 |
| commit | 4a7a54a55e7237386cacc73f173e74329773ac93 (patch) | |
| tree | 57bb38bb2970a9d462d0a4f6fcc035de46756fc7 /arch/x86 | |
| parent | 2989360d9c6669d8ae64edc933088e640481b48b (diff) | |
| download | linux-4a7a54a55e7237386cacc73f173e74329773ac93.tar.bz2 | |
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@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: vikas.shivappa@linux.intel.com
CC: gavin.hindman@intel.com
Cc: jithu.joseph@intel.com
Cc: hpa@zytor.com
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/intel_rdt_pseudo_lock.c | 2 |
1 files changed, 1 insertions, 1 deletions
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) |