diff options
| author | Tejun Heo <tj@kernel.org> | 2013-02-27 17:05:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-27 19:10:20 -0800 |
| commit | 54616283c2948812a44240858ced610e7cacbde1 (patch) | |
| tree | 268bbe9049d9370d5b644dfde51fc4a8942bae3b /include/linux | |
| parent | 050a6b47d98e2bcea909c1129111e721668aaa2c (diff) | |
idr: add idr_layer->prefix
Add a field which carries the prefix of ID the idr_layer covers. This
will be used to implement lookup hint.
This patch doesn't make use of the new field and doesn't introduce any
behavior difference.
Signed-off-by: Tejun Heo <tj@kernel.org>
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/idr.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/idr.h b/include/linux/idr.h index 43b87b1c77a..7b1c5c6f9a0 100644 --- a/include/linux/idr.h +++ b/include/linux/idr.h @@ -28,6 +28,7 @@ #define IDR_MASK ((1 << IDR_BITS)-1) struct idr_layer { + int prefix; /* the ID prefix of this idr_layer */ DECLARE_BITMAP(bitmap, IDR_SIZE); /* A zero bit means "space here" */ struct idr_layer __rcu *ary[1<<IDR_BITS]; int count; /* When zero, we can release it */ |