diff options
Diffstat (limited to 'include/asm-um/mmu_context.h')
| -rw-r--r-- | include/asm-um/mmu_context.h | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/include/asm-um/mmu_context.h b/include/asm-um/mmu_context.h index 89bff310b7a9..2edb4f1f789c 100644 --- a/include/asm-um/mmu_context.h +++ b/include/asm-um/mmu_context.h @@ -7,19 +7,31 @@ #define __UM_MMU_CONTEXT_H #include "linux/sched.h" +#include "linux/config.h" #include "choose-mode.h" +#include "um_mmu.h" #define get_mmu_context(task) do ; while(0) #define activate_context(tsk) do ; while(0) #define deactivate_mm(tsk,mm) do { } while (0) +extern void force_flush_all(void); + static inline void activate_mm(struct mm_struct *old, struct mm_struct *new) { + /* + * This is called by fs/exec.c and fs/aio.c. In the first case, for an + * exec, we don't need to do anything as we're called from userspace + * and thus going to use a new host PID. In the second, we're called + * from a kernel thread, and thus need to go doing the mmap's on the + * host. Since they're very expensive, we want to avoid that as far as + * possible. + */ + if (old != new && (current->flags & PF_BORROWED_MM)) + force_flush_all(); } -extern void switch_mm_skas(int mm_fd); - static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk) { @@ -30,7 +42,7 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, cpu_set(cpu, next->cpu_vm_mask); if(next != &init_mm) CHOOSE_MODE((void) 0, - switch_mm_skas(next->context.skas.mm_fd)); + switch_mm_skas(&next->context.skas.id)); } } |