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authorJosh Poimboeuf <jpoimboe@redhat.com>2019-03-27 15:00:29 +0300
committerThomas Gleixner <tglx@linutronix.de>2019-04-02 13:36:56 +0300
commitde7b77e5bb9451417ca57f1b6501da654587c048 (patch)
treefd3602eff330452501e3489c865a7fc26e1bed8a /include/linux/cpu.h
parent79a3aaa7b82e3106be97842dedfd8429248896e6 (diff)
downloadlinux-de7b77e5bb9451417ca57f1b6501da654587c048.tar.xz
cpu/hotplug: Create SMT sysfs interface for all arches
Make the /sys/devices/system/cpu/smt/* files available on all arches, so user space has a consistent way to detect whether SMT is enabled. The 'control' file now shows 'notimplemented' for architectures which don't yet have CONFIG_HOTPLUG_SMT. [ tglx: Make notimplemented a real state ] Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Waiman Long <longman@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Jiri Kosina <jikos@kernel.org> Link: https://lkml.kernel.org/r/469c2b98055f2c41e75748e06447d592a64080c9.1553635520.git.jpoimboe@redhat.com
Diffstat (limited to 'include/linux/cpu.h')
-rw-r--r--include/linux/cpu.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
index 5041357d0297..ae99dde02320 100644
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -175,6 +175,7 @@ enum cpuhp_smt_control {
CPU_SMT_DISABLED,
CPU_SMT_FORCE_DISABLED,
CPU_SMT_NOT_SUPPORTED,
+ CPU_SMT_NOT_IMPLEMENTED,
};
#if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
@@ -182,7 +183,7 @@ extern enum cpuhp_smt_control cpu_smt_control;
extern void cpu_smt_disable(bool force);
extern void cpu_smt_check_topology(void);
#else
-# define cpu_smt_control (CPU_SMT_ENABLED)
+# define cpu_smt_control (CPU_SMT_NOT_IMPLEMENTED)
static inline void cpu_smt_disable(bool force) { }
static inline void cpu_smt_check_topology(void) { }
#endif