The patch titled
Subject: mm: document locking restrictions for vm_operations_struct::close
has been added to the -mm tree. Its filename is
mm-document-locking-restrictions-for-vm_operations_struct-close.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-document-locking-restrictions-for-vm_operations_struct-close.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-document-locking-restrictions-for-vm_operations_struct-close.patch
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm: document locking restrictions for vm_operations_struct::close
Add comments for vm_operations_struct::close documenting locking
requirements for this callback and its callers.
Link: https://lkml.kernel.org/r/20211209191325.3069345-2-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Christian Brauner <christian@xxxxxxxxxx>
Cc: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Florian Weimer <fweimer@xxxxxxxxxx>
Cc: Jan Engelhardt <jengelh@xxxxxxx>
Cc: Jann Horn <jannh@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Tim Murray <timmurray@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 4 ++++
1 file changed, 4 insertions(+)
--- a/include/linux/mm.h~mm-document-locking-restrictions-for-vm_operations_struct-close
+++ a/include/linux/mm.h
@@ -532,6 +532,10 @@ enum page_entry_size {
*/
struct vm_operations_struct {
void (*open)(struct vm_area_struct * area);
+ /**
+ * @close: Called when the VMA is being removed from the MM.
+ * Context: User context. May sleep. Caller holds mmap_lock.
+ */
void (*close)(struct vm_area_struct * area);
/* Called any time before splitting to check if it's allowed */
int (*may_split)(struct vm_area_struct *area, unsigned long addr);
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
mm-add-a-field-to-store-names-for-private-anonymous-memory-fix.patch
mm-add-anonymous-vma-name-refcounting.patch
mm-protect-free_pgtables-with-mmap_lock-write-lock-in-exit_mmap.patch
mm-document-locking-restrictions-for-vm_operations_struct-close.patch
mm-oom_kill-allow-process_mrelease-to-run-under-mmap_lock-protection.patch
sysctl-change-watermark_scale_factor-max-limit-to-30%.patch
