Use -EIO as tsc value for nmi error (and drop event)

[lttng-modules.git] / lib / ringbuffer / frontend_api.h

diff --git a/lib/ringbuffer/frontend_api.h b/lib/ringbuffer/frontend_api.h
index d55eb33e31601658e15ca83865422be136b00fcb..8a58ace456ad29ab3235484ec52a01e15bc6e6d3 100644 (file)
--- a/lib/ringbuffer/frontend_api.h
+++ b/lib/ringbuffer/frontend_api.h
@@ -82,6 +82,8 @@ int lib_ring_buffer_try_reserve(const struct lib_ring_buffer_config *config,
        *o_old = *o_begin;
 
        ctx->tsc = lib_ring_buffer_clock_read(chan);
+       if ((int64_t) ctx->tsc == -EIO)
+               return 1;
 
        /*
         * Prefetch cacheline for read because we have to read the previous
@@ -130,8 +132,12 @@ int lib_ring_buffer_try_reserve(const struct lib_ring_buffer_config *config,
  * Atomic wait-free slot reservation. The reserved space starts at the context
  * "pre_offset". Its length is "slot_size". The associated time-stamp is "tsc".
  *
- * Return : -ENOSPC if not enough space, -EAGAIN if channel is disabled.
- *          Returns 0 on success.
+ * Return :
+ *  0 on success.
+ * -EAGAIN if channel is disabled.
+ * -ENOSPC if event size is too large for packet.
+ * -ENOBUFS if there is currently not enough space in buffer for the event.
+ * -EIO if data cannot be written into the buffer for any other reason.
  */
 
 static inline