diff options
| author | Andrea Righi <[email protected]> | 2020-11-28 10:15:17 +0100 |
|---|---|---|
| committer | Steven Rostedt (VMware) <[email protected]> | 2020-11-30 15:22:05 -0500 |
| commit | 8785f51a17083eee7c37606079c6447afc6ba102 (patch) | |
| tree | 27ebc928988e9b52f7311697260affe50052ea93 /lib/test_overflow.c | |
| parent | 55ea4cf403800af2ce6b125bc3d853117e0c0456 (diff) | |
ring-buffer: Set the right timestamp in the slow path of __rb_reserve_next()
In the slow path of __rb_reserve_next() a nested event(s) can happen
between evaluating the timestamp delta of the current event and updating
write_stamp via local_cmpxchg(); in this case the delta is not valid
anymore and it should be set to 0 (same timestamp as the interrupting
event), since the event that we are currently processing is not the last
event in the buffer.
Link: https://lkml.kernel.org/r/X8IVJcp1gRE+FJCJ@xps-13-7390
Cc: Ingo Molnar <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: [email protected]
Link: https://lwn.net/Articles/831207
Fixes: a389d86f7fd0 ("ring-buffer: Have nested events still record running time stamp")
Signed-off-by: Andrea Righi <[email protected]>
Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Diffstat (limited to 'lib/test_overflow.c')
0 files changed, 0 insertions, 0 deletions