diff options
| author |   Ralph Campbell <rcampbell@nvidia.com> | 2018-04-10 16:28:19 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-04-11 10:28:30 -0700 |
| commit | e1401513c6b5efec59678a4d4e9f90957684b7e3 (patch) | |
| tree | 3c3d5bd62643829a0f37155780161acbe5c290ed /include/linux | |
| parent | mm/hmm: fix header file if/else/endif maze (diff) | |
| download | linux-dev-e1401513c6b5efec59678a4d4e9f90957684b7e3.tar.xz linux-dev-e1401513c6b5efec59678a4d4e9f90957684b7e3.zip | |
mm/hmm: HMM should have a callback before MM is destroyed
hmm_mirror_register() registers a callback for when the CPU pagetable is
modified. Normally, the device driver will call hmm_mirror_unregister()
when the process using the device is finished. However, if the process
exits uncleanly, the struct_mm can be destroyed with no warning to the
device driver.
Link: http://lkml.kernel.org/r/20180323005527.758-4-jglisse@redhat.com
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Cc: Evgeny Baskakov <ebaskakov@nvidia.com>
Cc: Mark Hairgrove <mhairgrove@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/hmm.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/hmm.h b/include/linux/hmm.h index 36dd21fe5caf..fa7b51f65905 100644 --- a/include/linux/hmm.h +++ b/include/linux/hmm.h @@ -218,6 +218,16 @@ enum hmm_update_type { * @update: callback to update range on a device */ struct hmm_mirror_ops { + /* release() - release hmm_mirror + * + * @mirror: pointer to struct hmm_mirror + * + * This is called when the mm_struct is being released. + * The callback should make sure no references to the mirror occur + * after the callback returns. + */ + void (*release)(struct hmm_mirror *mirror); + /* sync_cpu_device_pagetables() - synchronize page tables * * @mirror: pointer to struct hmm_mirror |