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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2015-05-29 10:32:28 -0400 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2015-05-29 10:39:08 -0400 |
| commit | a497adb45b8691f7e477e711a1a4bd54748d64fe (patch) | |
| tree | 084b06ef058590c42e830a68faa0fa687d9fc079 /kernel/trace | |
| parent | 3c6296f716ebef704b76070d90567ab4faa8462c (diff) | |
| download | linux-a497adb45b8691f7e477e711a1a4bd54748d64fe.tar.bz2 | |
ring-buffer: Add enum names for the context levels
Instead of having hard coded numbers for the context levels, use
enums to describe them more.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace')
| -rw-r--r-- | kernel/trace/ring_buffer.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 0fc5add6423b..6260717c18e3 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -400,6 +400,23 @@ struct rb_irq_work { }; /* + * Used for which event context the event is in. + * NMI = 0 + * IRQ = 1 + * SOFTIRQ = 2 + * NORMAL = 3 + * + * See trace_recursive_lock() comment below for more details. + */ +enum { + RB_CTX_NMI, + RB_CTX_IRQ, + RB_CTX_SOFTIRQ, + RB_CTX_NORMAL, + RB_CTX_MAX +}; + +/* * head_page == tail_page && head == tail then buffer is empty. */ struct ring_buffer_per_cpu { @@ -2173,7 +2190,7 @@ static unsigned rb_calculate_event_length(unsigned length) /* zero length can cause confusions */ if (!length) - length = 1; + length++; if (length > RB_MAX_SMALL_DATA || RB_FORCE_8BYTE_ALIGNMENT) length += sizeof(event.array[0]); @@ -2631,13 +2648,13 @@ trace_recursive_lock(struct ring_buffer_per_cpu *cpu_buffer) if (in_interrupt()) { if (in_nmi()) - bit = 0; + bit = RB_CTX_NMI; else if (in_irq()) - bit = 1; + bit = RB_CTX_IRQ; else - bit = 2; + bit = RB_CTX_SOFTIRQ; } else - bit = 3; + bit = RB_CTX_NORMAL; if (unlikely(val & (1 << bit))) return 1; |