Linux 4.20.17

[thirdparty/kernel/stable.git] / kernel / cpu.c

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 91d5c38eb7e5b91a5d2cf821414f7cbbaa854c7a..f3b25d945727aaaf6486e3657e2948c553030f4f 100644 (file)
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -376,9 +376,6 @@ void __weak arch_smt_update(void) { }
 
 #ifdef CONFIG_HOTPLUG_SMT
 enum cpuhp_smt_control cpu_smt_control __read_mostly = CPU_SMT_ENABLED;
-EXPORT_SYMBOL_GPL(cpu_smt_control);
-
-static bool cpu_smt_available __read_mostly;
 
 void __init cpu_smt_disable(bool force)
 {
@@ -397,25 +394,11 @@ void __init cpu_smt_disable(bool force)
 
 /*
  * The decision whether SMT is supported can only be done after the full
- * CPU identification. Called from architecture code before non boot CPUs
- * are brought up.
- */
-void __init cpu_smt_check_topology_early(void)
-{
-       if (!topology_smt_supported())
-               cpu_smt_control = CPU_SMT_NOT_SUPPORTED;
-}
-
-/*
- * If SMT was disabled by BIOS, detect it here, after the CPUs have been
- * brought online. This ensures the smt/l1tf sysfs entries are consistent
- * with reality. cpu_smt_available is set to true during the bringup of non
- * boot CPUs when a SMT sibling is detected. Note, this may overwrite
- * cpu_smt_control's previous setting.
+ * CPU identification. Called from architecture code.
  */
 void __init cpu_smt_check_topology(void)
 {
-       if (!cpu_smt_available)
+       if (!topology_smt_supported())
                cpu_smt_control = CPU_SMT_NOT_SUPPORTED;
 }
 
@@ -428,18 +411,10 @@ early_param("nosmt", smt_cmdline_disable);
 
 static inline bool cpu_smt_allowed(unsigned int cpu)
 {
-       if (topology_is_primary_thread(cpu))
+       if (cpu_smt_control == CPU_SMT_ENABLED)
                return true;
 
-       /*
-        * If the CPU is not a 'primary' thread and the booted_once bit is
-        * set then the processor has SMT support. Store this information
-        * for the late check of SMT support in cpu_smt_check_topology().
-        */
-       if (per_cpu(cpuhp_state, cpu).booted_once)
-               cpu_smt_available = true;
-
-       if (cpu_smt_control == CPU_SMT_ENABLED)
+       if (topology_is_primary_thread(cpu))
                return true;
 
        /*