diff options
| author | Michel Lespinasse <michel@lespinasse.org> | 2023-02-27 20:36:09 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-06 06:02:57 +0300 |
| commit | 20cce633f4254cc0df39665449726e3172518f6c (patch) | |
| tree | 7988880c4a5fa5b34ffe26a7f6a9ea6af56e434d /include/linux/mm_types.h | |
| parent | 0b6cc04f3db3604c1485049bc9582523c2b44b75 (diff) | |
| download | linux-20cce633f4254cc0df39665449726e3172518f6c.tar.xz | |
mm: rcu safe VMA freeing
This prepares for page faults handling under VMA lock, looking up VMAs
under protection of an rcu read lock, instead of the usual mmap read lock.
Link: https://lkml.kernel.org/r/20230227173632.3292573-11-surenb@google.com
Signed-off-by: Michel Lespinasse <michel@lespinasse.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/mm_types.h')
| -rw-r--r-- | include/linux/mm_types.h | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 651a5c256732..f203e2562e00 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -480,9 +480,16 @@ struct anon_vma_name { struct vm_area_struct { /* The first cache line has the info for VMA tree walking. */ - unsigned long vm_start; /* Our start address within vm_mm. */ - unsigned long vm_end; /* The first byte after our end address - within vm_mm. */ + union { + struct { + /* VMA covers [vm_start; vm_end) addresses within mm */ + unsigned long vm_start; + unsigned long vm_end; + }; +#ifdef CONFIG_PER_VMA_LOCK + struct rcu_head vm_rcu; /* Used for deferred freeing. */ +#endif + }; struct mm_struct *vm_mm; /* The address space we belong to. */ pgprot_t vm_page_prot; /* Access permissions of this VMA. */ |