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Subject[PATCH 3/4] x86 mmiotrace: comment about user space ABI

Signed-off-by: Pekka Paalanen <pq@iki.fi>
---
include/linux/mmiotrace.h | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/include/linux/mmiotrace.h b/include/linux/mmiotrace.h
index cb24782..6ec288f 100644
--- a/include/linux/mmiotrace.h
+++ b/include/linux/mmiotrace.h
@@ -3,6 +3,10 @@

#include <asm/types.h>

+/*
+ * If you change anything here, you must bump MMIO_VERSION.
+ * This is the relay data format for user space.
+ */
#define MMIO_VERSION 0x04

/* mm_io_header.type */
@@ -23,7 +27,7 @@ enum mm_io_opcode { /* payload type: */
};

struct mm_io_header {
- __u32 type;
+ __u32 type; /* see MMIO_* macros above */
__u32 sec; /* timestamp */
__u32 nsec;
__u32 pid; /* PID of the process, or 0 for kernel core */
--
1.5.3.7


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