diff options
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 52f6c6b18f40..4c5981651407 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -44,6 +44,7 @@ #include <linux/userfaultfd_k.h> #include <linux/moduleparam.h> #include <linux/pkeys.h> +#include <linux/oom.h> #include <linux/uaccess.h> #include <asm/cacheflush.h> @@ -3001,6 +3002,23 @@ void exit_mmap(struct mm_struct *mm) /* Use -1 here to ensure all VMAs in the mm are unmapped */ unmap_vmas(&tlb, vma, 0, -1); + set_bit(MMF_OOM_SKIP, &mm->flags); + if (unlikely(tsk_is_oom_victim(current))) { + /* + * Wait for oom_reap_task() to stop working on this + * mm. Because MMF_OOM_SKIP is already set before + * calling down_read(), oom_reap_task() will not run + * on this "mm" post up_write(). + * + * tsk_is_oom_victim() cannot be set from under us + * either because current->mm is already set to NULL + * under task_lock before calling mmput and oom_mm is + * set not NULL by the OOM killer only if current->mm + * is found not NULL while holding the task_lock. + */ + down_write(&mm->mmap_sem); + up_write(&mm->mmap_sem); + } free_pgtables(&tlb, vma, FIRST_USER_ADDRESS, USER_PGTABLES_CEILING); tlb_finish_mmu(&tlb, 0, -1); |