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Groups > linux.kernel > #1441577
| From | Steven Rostedt <rostedt@goodmis.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH RT 6/8] trace: correct off by one while recording the trace-event |
| Date | 2016-07-12 19:00 +0200 |
| Message-ID | <rU9cm-7AG-43@gated-at.bofh.it> (permalink) |
| References | <rU9cm-7AG-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.10.102-rt113-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Trace events like raw_syscalls show always a preempt code of one. The reason is that on PREEMPT kernels rcu_read_lock_sched_notrace() increases the preemption counter and the function recording the counter is caller within the RCU section. Cc: stable-rt@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> [ Changed this to upstream version. See commit e947841c0dce ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- include/trace/ftrace.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h index dbb47418df81..f30e85b675e8 100644 --- a/include/trace/ftrace.h +++ b/include/trace/ftrace.h @@ -526,6 +526,9 @@ ftrace_raw_event_##call(void *__data, proto) \ \ local_save_flags(irq_flags); \ pc = preempt_count(); \ + /* Account for tracepoint preempt disable */ \ + if (IS_ENABLED(CONFIG_PREEMPT)) \ + pc--; \ \ __data_size = ftrace_get_offsets_##call(&__data_offsets, args); \ \ -- 2.8.1
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[PATCH RT 0/8] Linux 3.10.102-rt113-rc1 Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 8/8] Linux 3.10.102-rt113-rc1 Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 6/8] trace: correct off by one while recording the trace-event Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 4/8] kernel/printk: Dont try to print from IRQ/NMI region Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 3/8] list_bl: fixup bogus lockdep warning Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:00 +0200 [PATCH RT 7/8] x86: Fix an RT MCE crash Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:10 +0200 [PATCH RT 1/8] kvm, rt: change async pagefault code locking for PREEMPT_RT Steven Rostedt <rostedt@goodmis.org> - 2016-07-12 19:10 +0200
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