Release 4.16 arch/x86/include/asm/sync_core.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_SYNC_CORE_H

#define _ASM_X86_SYNC_CORE_H

#include <linux/preempt.h>
#include <asm/processor.h>
#include <asm/cpufeature.h>

/*
 * Ensure that a core serializing instruction is issued before returning
 * to user-mode. x86 implements return to user-space through sysexit,
 * sysrel, and sysretq, which are not core serializing.
 */


static inline void sync_core_before_usermode(void)
{
	/* With PTI, we unconditionally serialize before running user code. */
	if (static_cpu_has(X86_FEATURE_PTI))
		return;
	/*
         * Return from interrupt and NMI is done through iret, which is core
         * serializing.
         */
	if (in_irq() || in_nmi())
		return;
	sync_core();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mathieu Desnoyers
31
100.00%
1
100.00%
Total
31
100.00%
1
100.00%

#endif /* _ASM_X86_SYNC_CORE_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Mathieu Desnoyers
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%
Directory: arch/x86/include/asm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.