mmu_context.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef _LINUX_MMU_CONTEXT_H
 3#define _LINUX_MMU_CONTEXT_H
 4
 5#include <asm/mmu_context.h>
 6#include <asm/mmu.h>
 7
 8/* Architectures that care about IRQ state in switch_mm can override this. */
 9#ifndef switch_mm_irqs_off
10# define switch_mm_irqs_off switch_mm
11#endif
12
13#ifndef leave_mm
14static inline void leave_mm(void) { }
15#endif
16
17/*
18 * CPUs that are capable of running user task @p. Must contain at least one
19 * active CPU. It is assumed that the kernel can run on all CPUs, so calling
20 * this for a kernel thread is pointless.
21 *
22 * By default, we assume a sane, homogeneous system.
23 */
24#ifndef task_cpu_possible_mask
25# define task_cpu_possible_mask(p)	cpu_possible_mask
26# define task_cpu_possible(cpu, p)	true
27# define task_cpu_fallback_mask(p)	housekeeping_cpumask(HK_TYPE_TICK)
28#else
29# define task_cpu_possible(cpu, p)	cpumask_test_cpu((cpu), task_cpu_possible_mask(p))
30#endif
31
32#ifndef mm_untag_mask
33static inline unsigned long mm_untag_mask(struct mm_struct *mm)
34{
35	return -1UL;
36}
37#endif
38
39#ifndef arch_pgtable_dma_compat
40static inline bool arch_pgtable_dma_compat(struct mm_struct *mm)
41{
42	return true;
43}
44#endif
45
46#endif