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ring-buffer: Add enum names for the context levels

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Instead of having hard coded numbers for the context levels, use
enums to describe them more.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2015-05-29 10:32:28 -04:00 committed by Steven Rostedt
parent 3c6296f716
commit a497adb45b
1 changed files with 22 additions and 5 deletions
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27
kernel/trace/ring_buffer.c
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@ -399,6 +399,23 @@ struct rb_irq_work {
bool wakeup_full; bool wakeup_full;
}; };
/*
* 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. * head_page == tail_page && head == tail then buffer is empty.
*/ */
@ -2173,7 +2190,7 @@ static unsigned rb_calculate_event_length(unsigned length)
/* zero length can cause confusions */ /* zero length can cause confusions */
if (!length) if (!length)
length = 1; length++;
if (length > RB_MAX_SMALL_DATA || RB_FORCE_8BYTE_ALIGNMENT) if (length > RB_MAX_SMALL_DATA || RB_FORCE_8BYTE_ALIGNMENT)
length += sizeof(event.array[0]); length += sizeof(event.array[0]);
@ -2631,13 +2648,13 @@ trace_recursive_lock(struct ring_buffer_per_cpu *cpu_buffer)
if (in_interrupt()) { if (in_interrupt()) {
if (in_nmi()) if (in_nmi())
bit = 0; bit = RB_CTX_NMI;
else if (in_irq()) else if (in_irq())
bit = 1; bit = RB_CTX_IRQ;
else else
bit = 2; bit = RB_CTX_SOFTIRQ;
} else } else
bit = 3; bit = RB_CTX_NORMAL;
if (unlikely(val & (1 << bit))) if (unlikely(val & (1 << bit)))
return 1; return 1;