diff options
| author | Manfred Spraul <[email protected]> | 2017-07-12 14:34:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2017-07-12 16:26:01 -0700 |
| commit | dba4cdd39e698d8dcdad0656825423052ac90ccd (patch) | |
| tree | 908f984f4652a42f603aac8f2db4edd059d11256 /include/linux | |
| parent | 1a23395672658969a4035dcc518ea6cab835c579 (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.
[[email protected]: really include the memset() into ipc_alloc_rcu()]
Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Manfred Spraul <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Kees Cook <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'include/linux')
| -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 */ |