diff options
| author | Manfred Spraul <manfred@colorfullife.com> | 2017-05-26 11:32:25 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-05-29 09:23:44 +1000 |
| commit | 90b17f7ac4d56b4087379f31115335269c063fc8 (patch) | |
| tree | b32305524cb9fe7ab0e6f520cc882b441d2750f6 /include | |
| parent | ba22f119d4dcb70c3e1aa1328cb27ac59663baca (diff) | |
ipc: merge ipc_rcu and kern_ipc_perm
ipc has two management structures that exist for every id:
- struct kern_ipc_perm, it contains e.g. the permissions.
- struct ipc_rcu, it contains the rcu head for rcu handling and
the refcount.
The patch merges both structures.
As a bonus, we may save one cacheline, because both structures are
cacheline aligned.
In addition, it reduces the number of casts, instead most codepaths can
use container_of.
To simplify code, the ipc_rcu_alloc initializes the allocation to 0.
Link: http://lkml.kernel.org/r/20170525185107.12869-3-manfred@colorfullife.com
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/ipc.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/ipc.h b/include/linux/ipc.h index 71fd92d81b26..5591f055e13f 100644 --- a/include/linux/ipc.h +++ b/include/linux/ipc.h @@ -20,6 +20,9 @@ struct kern_ipc_perm { umode_t mode; unsigned long seq; void *security; + + struct rcu_head rcu; + atomic_t refcount; } ____cacheline_aligned_in_smp; #endif /* _LINUX_IPC_H */ |