[tip:x86/pti] sched/smt: Expose sched_smt_present static key
Commit-ID: 321a874a7ef85655e93b3206d0f36b4a6097f948
Gitweb: https://git.kernel.org/tip/321a874a7ef85655e93b3206d0f36b4a6097f948
Author: Thomas Gleixner
AuthorDate: Sun, 25 Nov 2018 19:33:38 +0100
Committer: Thomas Gleixner
CommitDate: Wed, 28 Nov 2018 11:57:07 +0100
sched/smt: Expose sched_smt_present static key
Make the scheduler's 'sched_smt_present' static key globaly available, so
it can be used in the x86 speculation control code.
Provide a query function and a stub for the CONFIG_SMP=n case.
Signed-off-by: Thomas Gleixner
Reviewed-by: Ingo Molnar
Cc: Peter Zijlstra
Cc: Andy Lutomirski
Cc: Linus Torvalds
Cc: Jiri Kosina
Cc: Tom Lendacky
Cc: Josh Poimboeuf
Cc: Andrea Arcangeli
Cc: David Woodhouse
Cc: Tim Chen
Cc: Andi Kleen
Cc: Dave Hansen
Cc: Casey Schaufler
Cc: Asit Mallick
Cc: Arjan van de Ven
Cc: Jon Masters
Cc: Waiman Long
Cc: Greg KH
Cc: Dave Stewart
Cc: Kees Cook
Cc: sta...@vger.kernel.org
Link: https://lkml.kernel.org/r/20181125185004.430168...@linutronix.de
---
include/linux/sched/smt.h | 18 ++
kernel/sched/sched.h | 4 +---
2 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/include/linux/sched/smt.h b/include/linux/sched/smt.h
new file mode 100644
index ..c9e0be514110
--- /dev/null
+++ b/include/linux/sched/smt.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SCHED_SMT_H
+#define _LINUX_SCHED_SMT_H
+
+#include
+
+#ifdef CONFIG_SCHED_SMT
+extern struct static_key_false sched_smt_present;
+
+static __always_inline bool sched_smt_active(void)
+{
+ return static_branch_likely(_smt_present);
+}
+#else
+static inline bool sched_smt_active(void) { return false; }
+#endif
+
+#endif
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 618577fc9aa8..4e524ab589c9 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -23,6 +23,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -936,9 +937,6 @@ static inline int cpu_of(struct rq *rq)
#ifdef CONFIG_SCHED_SMT
-
-extern struct static_key_false sched_smt_present;
-
extern void __update_idle_core(struct rq *rq);
static inline void update_idle_core(struct rq *rq)
[tip:x86/pti] sched/smt: Expose sched_smt_present static key
Commit-ID: 321a874a7ef85655e93b3206d0f36b4a6097f948
Gitweb: https://git.kernel.org/tip/321a874a7ef85655e93b3206d0f36b4a6097f948
Author: Thomas Gleixner
AuthorDate: Sun, 25 Nov 2018 19:33:38 +0100
Committer: Thomas Gleixner
CommitDate: Wed, 28 Nov 2018 11:57:07 +0100
sched/smt: Expose sched_smt_present static key
Make the scheduler's 'sched_smt_present' static key globaly available, so
it can be used in the x86 speculation control code.
Provide a query function and a stub for the CONFIG_SMP=n case.
Signed-off-by: Thomas Gleixner
Reviewed-by: Ingo Molnar
Cc: Peter Zijlstra
Cc: Andy Lutomirski
Cc: Linus Torvalds
Cc: Jiri Kosina
Cc: Tom Lendacky
Cc: Josh Poimboeuf
Cc: Andrea Arcangeli
Cc: David Woodhouse
Cc: Tim Chen
Cc: Andi Kleen
Cc: Dave Hansen
Cc: Casey Schaufler
Cc: Asit Mallick
Cc: Arjan van de Ven
Cc: Jon Masters
Cc: Waiman Long
Cc: Greg KH
Cc: Dave Stewart
Cc: Kees Cook
Cc: sta...@vger.kernel.org
Link: https://lkml.kernel.org/r/20181125185004.430168...@linutronix.de
---
include/linux/sched/smt.h | 18 ++
kernel/sched/sched.h | 4 +---
2 files changed, 19 insertions(+), 3 deletions(-)
diff --git a/include/linux/sched/smt.h b/include/linux/sched/smt.h
new file mode 100644
index ..c9e0be514110
--- /dev/null
+++ b/include/linux/sched/smt.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_SCHED_SMT_H
+#define _LINUX_SCHED_SMT_H
+
+#include
+
+#ifdef CONFIG_SCHED_SMT
+extern struct static_key_false sched_smt_present;
+
+static __always_inline bool sched_smt_active(void)
+{
+ return static_branch_likely(_smt_present);
+}
+#else
+static inline bool sched_smt_active(void) { return false; }
+#endif
+
+#endif
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 618577fc9aa8..4e524ab589c9 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -23,6 +23,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -936,9 +937,6 @@ static inline int cpu_of(struct rq *rq)
#ifdef CONFIG_SCHED_SMT
-
-extern struct static_key_false sched_smt_present;
-
extern void __update_idle_core(struct rq *rq);
static inline void update_idle_core(struct rq *rq)
