diff options
| author | Shan Hai <haishan.bai@gmail.com> | 2011-09-01 11:32:03 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-09-13 11:12:22 +0200 |
| commit | f59ca05871a055a73f8e626f2d868f0da248e22c (patch) | |
| tree | dd077b2cbbf92f9dbda925d8bff9e567f5a56b3f /Documentation/misc-devices | |
| parent | 3b8f40481513a7b6123def5a02db4cff96ae2198 (diff) | |
| download | talos-op-linux-f59ca05871a055a73f8e626f2d868f0da248e22c.tar.gz talos-op-linux-f59ca05871a055a73f8e626f2d868f0da248e22c.zip | |
locking, lib/atomic64: Annotate atomic64_lock::lock as raw
The spinlock protected atomic64 operations must be irq safe as they
are used in hard interrupt context and cannot be preempted on -rt:
NIP [c068b218] rt_spin_lock_slowlock+0x78/0x3a8
LR [c068b1e0] rt_spin_lock_slowlock+0x40/0x3a8
Call Trace:
[eb459b90] [c068b1e0] rt_spin_lock_slowlock+0x40/0x3a8 (unreliable)
[eb459c20] [c068bdb0] rt_spin_lock+0x40/0x98
[eb459c40] [c03d2a14] atomic64_read+0x48/0x84
[eb459c60] [c001aaf4] perf_event_interrupt+0xec/0x28c
[eb459d10] [c0010138] performance_monitor_exception+0x7c/0x150
[eb459d30] [c0014170] ret_from_except_full+0x0/0x4c
So annotate it.
In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.
Signed-off-by: Shan Hai <haishan.bai@gmail.com>
Reviewed-by: Yong Zhang <yong.zhang0@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/misc-devices')
0 files changed, 0 insertions, 0 deletions
