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Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 94430ea8b4a5..303cb0591b4b 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -659,11 +659,19 @@ static inline bool cpu_smt_thread_allowed(unsigned int cpu)
#endif
}
-static inline bool cpu_smt_allowed(unsigned int cpu)
+static inline bool cpu_bootable(unsigned int cpu)
{
if (cpu_smt_control == CPU_SMT_ENABLED && cpu_smt_thread_allowed(cpu))
return true;
+ /* All CPUs are bootable if controls are not configured */
+ if (cpu_smt_control == CPU_SMT_NOT_IMPLEMENTED)
+ return true;
+
+ /* All CPUs are bootable if CPU is not SMT capable */
+ if (cpu_smt_control == CPU_SMT_NOT_SUPPORTED)
+ return true;
+
if (topology_is_primary_thread(cpu))
return true;
@@ -685,7 +693,7 @@ bool cpu_smt_possible(void)
EXPORT_SYMBOL_GPL(cpu_smt_possible);
#else
-static inline bool cpu_smt_allowed(unsigned int cpu) { return true; }
+static inline bool cpu_bootable(unsigned int cpu) { return true; }
#endif
static inline enum cpuhp_state
@@ -788,10 +796,10 @@ static int bringup_wait_for_ap_online(unsigned int cpu)
* SMT soft disabling on X86 requires to bring the CPU out of the
* BIOS 'wait for SIPI' state in order to set the CR4.MCE bit. The
* CPU marked itself as booted_once in notify_cpu_starting() so the
- * cpu_smt_allowed() check will now return false if this is not the
+ * cpu_bootable() check will now return false if this is not the
* primary sibling.
*/
- if (!cpu_smt_allowed(cpu))
+ if (!cpu_bootable(cpu))
return -ECANCELED;
return 0;
}
@@ -1744,7 +1752,7 @@ static int cpu_up(unsigned int cpu, enum cpuhp_state target)
err = -EBUSY;
goto out;
}
- if (!cpu_smt_allowed(cpu)) {
+ if (!cpu_bootable(cpu)) {
err = -EPERM;
goto out;
}