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sched/smt: Expose sched_smt_present static key

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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 <[email protected]>
Reviewed-by: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Jiri Kosina <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Andrea Arcangeli <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Casey Schaufler <[email protected]>
Cc: Asit Mallick <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Jon Masters <[email protected]>
Cc: Waiman Long <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Dave Stewart <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
This commit is contained in:
Thomas Gleixner committed 2018-11-28 11:57:07 +01:00
1 parent dbe733642e
commit 321a874a7e
2 files changed
+19 -3
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include/linux/sched/smt.h
+18
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@@ -0,0 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SCHED_SMT_H
#define _LINUX_SCHED_SMT_H
#include <linux/static_key.h>
#ifdef CONFIG_SCHED_SMT
extern struct static_key_false sched_smt_present;
static __always_inline bool sched_smt_active(void)
{
return static_branch_likely(&sched_smt_present);
}
#else
static inline bool sched_smt_active(void) { return false; }
#endif
#endif
kernel/sched/sched.h
+1 -3
View File
@@ -23,6 +23,7 @@
#include <linux/sched/prio.h>
#include <linux/sched/rt.h>
#include <linux/sched/signal.h>
#include <linux/sched/smt.h>
#include <linux/sched/stat.h>
#include <linux/sched/sysctl.h>
#include <linux/sched/task.h>
@@ -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)