linux-kernel - [PATCH] blktrace: fix comment in blktrace

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Date:   Fri, 30 Mar 2018 14:32:42 -0500
From:   Souvik Banerjee <souvik1997@...il.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     souvik1997@...il.com, Eric Biggers <ebiggers@...gle.com>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shaohua Li <shli@...com>, linux-kernel@...r.kernel.org
Subject: [PATCH] blktrace: fix comment in blktrace_api.h

The `__u64 time` field of the blk_io_trace struct refers to
the time in nanoseconds, not in microseconds. It is set in
__blk_add_trace, which does the following:

    t->time = ktime_to_ns(ktime_get());

ktime_to_ns returns ktime_t in nanoseconds, not microseconds.

Signed-off-by: Souvik Banerjee <souvik1997@...il.com>
---
 include/uapi/linux/blktrace_api.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/uapi/linux/blktrace_api.h b/include/uapi/linux/blktrace_api.h
index 3c50e07ee833..690621b610e5 100644
--- a/include/uapi/linux/blktrace_api.h
+++ b/include/uapi/linux/blktrace_api.h
@@ -101,7 +101,7 @@ enum blktrace_notify {
 struct blk_io_trace {
 	__u32 magic;		/* MAGIC << 8 | version */
 	__u32 sequence;		/* event number */
-	__u64 time;		/* in microseconds */
+	__u64 time;		/* in nanoseconds */
 	__u64 sector;		/* disk offset */
 	__u32 bytes;		/* transfer length */
 	__u32 action;		/* what happened */
-- 
2.16.3