1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c
index 1cedc3468ce5..a2e3b76bfdc1 100644
--- a/arch/x86/kernel/cpu/perf_counter.c
+++ b/arch/x86/kernel/cpu/perf_counter.c
@@ -247,6 +247,10 @@ static u64 pmc_amd_save_disable_all(void)
 
         enabled = cpuc->enabled;
         cpuc->enabled = 0;
+        /*
+         * ensure we write the disable before we start disabling the
+         * counters proper, so that pcm_amd_enable() does the right thing.
+         */
         barrier();
 
         for (idx = 0; idx < nr_counters_generic; idx++) {