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Mathieu Desnoyers
e61938a921
Introduce an architecture function that ensures the current CPU issues a core serializing instruction before returning to usermode. This is needed for the membarrier "sync_core" command. Architectures defining the sync_core_before_usermode() static inline need to select ARCH_HAS_SYNC_CORE_BEFORE_USERMODE. Signed-off-by: Mathieu Desnoyers <[email protected]> Acked-by: Thomas Gleixner <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Cc: Andrea Parri <[email protected]> Cc: Andrew Hunter <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Avi Kivity <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Boqun Feng <[email protected]> Cc: Dave Watson <[email protected]> Cc: David Sehr <[email protected]> Cc: Greg Hackmann <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Maged Michael <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Paul E. McKenney <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Russell King <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
22 lines
581 B
C
22 lines
581 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SYNC_CORE_H
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#define _LINUX_SYNC_CORE_H
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#ifdef CONFIG_ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
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#include <asm/sync_core.h>
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#else
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/*
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* This is a dummy sync_core_before_usermode() implementation that can be used
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* on all architectures which return to user-space through core serializing
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* instructions.
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* If your architecture returns to user-space through non-core-serializing
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* instructions, you need to write your own functions.
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*/
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static inline void sync_core_before_usermode(void)
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{
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}
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#endif
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#endif /* _LINUX_SYNC_CORE_H */
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