xref: /linux/include/linux/mmu_context.h (revision 1d6d3992235ed08929846f98fecf79682e0b422c)

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_MMU_CONTEXT_H
#define _LINUX_MMU_CONTEXT_H

#include <asm/mmu_context.h>
#include <asm/mmu.h>

/* Architectures that care about IRQ state in switch_mm can override this. */
#ifndef switch_mm_irqs_off
# define switch_mm_irqs_off switch_mm
#endif

#ifndef leave_mm
static inline void leave_mm(void) { }
#endif

/*
 * CPUs that are capable of running user task @p. Must contain at least one
 * active CPU. It is assumed that the kernel can run on all CPUs, so calling
 * this for a kernel thread is pointless.
 *
 * By default, we assume a sane, homogeneous system.
 */
#ifndef task_cpu_possible_mask
# define task_cpu_possible_mask(p)	cpu_possible_mask
# define task_cpu_possible(cpu, p)	true
# define task_cpu_fallback_mask(p)	housekeeping_cpumask(HK_TYPE_TICK)
#else
# define task_cpu_possible(cpu, p)	cpumask_test_cpu((cpu), task_cpu_possible_mask(p))
#endif

#ifndef mm_untag_mask
static inline unsigned long mm_untag_mask(struct mm_struct *mm)
{
	return -1UL;
}
#endif

#ifndef arch_pgtable_dma_compat
static inline bool arch_pgtable_dma_compat(struct mm_struct *mm)
{
	return true;
}
#endif

#endif