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Thomas Gleixner
a74cfffb03
arch_smt_update() is only called when the sysfs SMT control knob is changed. This means that when SMT is enabled in the sysfs control knob the system is considered to have SMT active even if all siblings are offline. To allow finegrained control of the speculation mitigations, the actual SMT state is more interesting than the fact that siblings could be enabled. Rework the code, so arch_smt_update() is invoked from each individual CPU hotplug function, and simplify the update function while at it. 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]
21 lines
415 B
C
21 lines
415 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_SMT_H
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#define _LINUX_SCHED_SMT_H
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#include <linux/static_key.h>
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#ifdef CONFIG_SCHED_SMT
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extern struct static_key_false sched_smt_present;
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static __always_inline bool sched_smt_active(void)
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{
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return static_branch_likely(&sched_smt_present);
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}
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#else
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static inline bool sched_smt_active(void) { return false; }
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#endif
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void arch_smt_update(void);
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#endif
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