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authorPekka Paalanen <pq@iki.fi>2008-05-12 23:20:57 +0400
committerThomas Gleixner <tglx@linutronix.de>2008-05-24 13:21:48 +0400
commit63ffa3e456c1a9884a3ebac997d91e3fdae18d78 (patch)
tree7dd0c780c395e06e2bb5f47e5c35b9a00faf047e /include/linux/mmiotrace.h
parentfe1ffafa80f6673101c6560c2bacfe3df10372ee (diff)
downloadlinux-63ffa3e456c1a9884a3ebac997d91e3fdae18d78.tar.xz
x86 mmiotrace: comment about user space ABI
Signed-off-by: Pekka Paalanen <pq@iki.fi> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/mmiotrace.h')
-rw-r--r--include/linux/mmiotrace.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/mmiotrace.h b/include/linux/mmiotrace.h
index cb247825f3ec..6ec288f1fe24 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 */