diff options
| author | Brian Behlendorf <[email protected]> | 2011-06-24 11:57:14 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2011-06-24 13:00:08 -0700 |
| commit | 86fd39f354778eb10e77a7c1660b59ca16ffcc16 (patch) | |
| tree | ddba0bbdcc45babd1863a732c96bc475a19251a7 /include/sys | |
| parent | 79593b0dec57ee94c5bb56cdc2770ebde81ecea9 (diff) | |
Linux 2.6.39 compat, mutex owner
Prior to Linux 2.6.39 when CONFIG_DEBUG_MUTEXES was defined
the kernel stored a thread_info pointer as the mutex owner.
From this you could get the pointer of the current task_struct
to compare with get_current().
As of Linux 2.6.39 this behavior has changed and now the mutex
stores a pointer to the task_struct. This commit detects the
type of pointer stored in the mutex and adjusts the mutex_owner()
and mutex_owned() functions to perform the correct comparision.
Diffstat (limited to 'include/sys')
| -rw-r--r-- | include/sys/mutex.h | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/include/sys/mutex.h b/include/sys/mutex.h index ebf9151f1..659214f50 100644 --- a/include/sys/mutex.h +++ b/include/sys/mutex.h @@ -48,21 +48,18 @@ typedef struct { static inline kthread_t * mutex_owner(kmutex_t *mp) { - struct thread_info *owner; - - owner = ACCESS_ONCE(mp->m.owner); - if (owner) - return owner->task; - - return NULL; -} +#if defined(HAVE_MUTEX_OWNER_TASK_STRUCT) + return ACCESS_ONCE(mp->m.owner); +#else + struct thread_info *owner = ACCESS_ONCE(mp->m.owner); + if (owner) + return owner->task; -static inline int -mutex_owned(kmutex_t *mp) -{ - return (ACCESS_ONCE(mp->m.owner) == current_thread_info()); + return NULL; +#endif } +#define mutex_owned(mp) (mutex_owner(mp) == current) #define MUTEX_HELD(mp) mutex_owned(mp) #define MUTEX_NOT_HELD(mp) (!MUTEX_HELD(mp)) #undef mutex_init |