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| author | Matt Brown <matthew.brown.dev@gmail.com> | 2017-07-07 11:52:43 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2018-03-07 17:15:02 +1100 |
| commit | 2d4c774c2a3ad5413272e9d17827e4eb3956be87 (patch) | |
| tree | 8696fe9463fc43946d9061fb7c11dda12ac5fe11 /include | |
| parent | 217f74b0c40e176917f604e0b3d40fb44598f07c (diff) | |
| download | skiboot-2d4c774c2a3ad5413272e9d17827e4eb3956be87.zip skiboot-2d4c774c2a3ad5413272e9d17827e4eb3956be87.tar.gz skiboot-2d4c774c2a3ad5413272e9d17827e4eb3956be87.tar.bz2 | |
core/lock: Add deadlock detection
This adds simple deadlock detection. The detection looks for circular
dependencies in the lock requests. It will abort and display a stack trace
when a deadlock occurs.
The detection is enabled by DEBUG_LOCKS (enabled by default).
While the detection may have a slight performance overhead, as there are
not a huge number of locks in skiboot this overhead isn't significant.
Signed-off-by: Matt Brown <matthew.brown.dev@gmail.com>
[stewart: fix build with DEBUG_LOCKS off]
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/cpu.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/cpu.h b/include/cpu.h index 2ec6f03..220fa1d 100644 --- a/include/cpu.h +++ b/include/cpu.h @@ -120,6 +120,11 @@ struct cpu_thread { u32 sensor_attr; u32 token; bool dts_read_in_progress; + +#ifdef DEBUG_LOCKS + /* The lock requested by this cpu, used for deadlock detection */ + struct lock *requested_lock; +#endif }; /* This global is set to 1 to allow secondaries to callin, |