From: "Steven Rostedt (Red Hat)" <[email protected]> Instead of having hard coded numbers for the context levels, use enums to describe them more.
Signed-off-by: Steven Rostedt <[email protected]> --- kernel/trace/ring_buffer.c | 27 ++++++++++++++++++++++----- 1 file 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; -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
