diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/mm_types.h | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 165c58b12ccc..003619fab20e 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -660,6 +660,9 @@ struct vma_numab_state { * per VM-area/task. A VM area is any part of the process virtual memory * space that has a special rule for the page-fault handlers (ie a shared * library, the executable area etc). + * + * Only explicitly marked struct members may be accessed by RCU readers before + * getting a stable reference. */ struct vm_area_struct { /* The first cache line has the info for VMA tree walking. */ @@ -675,7 +678,11 @@ struct vm_area_struct { #endif }; - struct mm_struct *vm_mm; /* The address space we belong to. */ + /* + * The address space we belong to. + * Unstable RCU readers are allowed to read this. + */ + struct mm_struct *vm_mm; pgprot_t vm_page_prot; /* Access permissions of this VMA. */ /* @@ -688,7 +695,10 @@ struct vm_area_struct { }; #ifdef CONFIG_PER_VMA_LOCK - /* Flag to indicate areas detached from the mm->mm_mt tree */ + /* + * Flag to indicate areas detached from the mm->mm_mt tree. + * Unstable RCU readers are allowed to read this. + */ bool detached; /* @@ -706,6 +716,7 @@ struct vm_area_struct { * slowpath. */ int vm_lock_seq; + /* Unstable RCU readers are allowed to read this. */ struct vma_lock *vm_lock; #endif |