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Linux 2.6.39 compat, mutex owner

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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.
This commit is contained in:
Brian Behlendorf
2011-06-24 11:57:14 -07:00
parent 79593b0dec
commit 86fd39f354
4 changed files with 177 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/mutex.h
+9 -12
View File
@@ -48,21 +48,18 @@ typedef struct {
static inline kthread_t *
mutex_owner(kmutex_t *mp)
{
struct thread_info *owner;
#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;
owner = ACCESS_ONCE(mp->m.owner);
if (owner)
return owner->task;
return NULL;
}
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