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| author |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-07-04 13:13:55 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2012-07-04 13:13:55 -0700 |
| commit | 404c3bc30cb1361e1b3533643326ab472d24a618 (patch) | |
| tree | 156cc9032c8aee17167d926c5bdae009ba8f36d2 /include/linux/lockdep.h | |
| parent | Input: wacom - TPC2FG doesn't store touch id for slots (diff) | |
| parent | Linux 3.5-rc5 (diff) | |
| download | linux-dev-404c3bc30cb1361e1b3533643326ab472d24a618.tar.xz linux-dev-404c3bc30cb1361e1b3533643326ab472d24a618.zip | |
Merge commit 'v3.5-rc5' into next
Diffstat (limited to 'include/linux/lockdep.h')
| -rw-r--r-- | include/linux/lockdep.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h index d36619ead3ba..00e46376e28f 100644 --- a/include/linux/lockdep.h +++ b/include/linux/lockdep.h @@ -157,6 +157,24 @@ struct lockdep_map { #endif }; +static inline void lockdep_copy_map(struct lockdep_map *to, + struct lockdep_map *from) +{ + int i; + + *to = *from; + /* + * Since the class cache can be modified concurrently we could observe + * half pointers (64bit arch using 32bit copy insns). Therefore clear + * the caches and take the performance hit. + * + * XXX it doesn't work well with lockdep_set_class_and_subclass(), since + * that relies on cache abuse. + */ + for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++) + to->class_cache[i] = NULL; +} + /* * Every lock has a list of other locks that were taken after it. * We only grow the list, never remove from it: |