include/linux/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
  14 static 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 #else
  28 # define task_cpu_possible(cpu, p)      cpumask_test_cpu((cpu), task_cpu_possible_mask(p))
  29 #endif
  30
  31 #ifndef mm_untag_mask
  32 static inline unsigned long mm_untag_mask(struct mm_struct *mm)
  33 {
  34         return -1UL;
  35 }
  36 #endif
  37
  38 #ifndef arch_pgtable_dma_compat
  39 static inline bool arch_pgtable_dma_compat(struct mm_struct *mm)
  40 {
  41         return true;
  42 }
  43 #endif
  44
  45 #endif