linux-kernel - [PATCH 5.13 271/300] io_uring: io_uring_complete() trace should take an integer

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Date:   Mon, 13 Sep 2021 15:15:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 5.13 271/300] io_uring: io_uring_complete() trace should take an integer

From: Jens Axboe <axboe@...nel.dk>

commit 2fc2a7a62eb58650e71b4550cf6fa6cc0a75b2d2 upstream.

It currently takes a long, and while that's normally OK, the io_uring
limit is an int. Internally in io_uring it's an int, but sometimes it's
passed as a long. That can yield confusing results where a completions
seems to generate a huge result:

ou-sqp-1297-1298    [001] ...1   788.056371: io_uring_complete: ring 000000000e98e046, user_data 0x0, result 4294967171, cflags 0

which is due to -ECANCELED being stored in an unsigned, and then passed
in as a long. Using the right int type, the trace looks correct:

iou-sqp-338-339     [002] ...1    15.633098: io_uring_complete: ring 00000000e0ac60cf, user_data 0x0, result -125, cflags 0

Cc: stable@...r.kernel.org
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/trace/events/io_uring.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/include/trace/events/io_uring.h
+++ b/include/trace/events/io_uring.h
@@ -295,14 +295,14 @@ TRACE_EVENT(io_uring_fail_link,
  */
 TRACE_EVENT(io_uring_complete,
 
-	TP_PROTO(void *ctx, u64 user_data, long res, unsigned cflags),
+	TP_PROTO(void *ctx, u64 user_data, int res, unsigned cflags),
 
 	TP_ARGS(ctx, user_data, res, cflags),
 
 	TP_STRUCT__entry (
 		__field(  void *,	ctx		)
 		__field(  u64,		user_data	)
-		__field(  long,		res		)
+		__field(  int,		res		)
 		__field(  unsigned,	cflags		)
 	),
 
@@ -313,7 +313,7 @@ TRACE_EVENT(io_uring_complete,
 		__entry->cflags		= cflags;
 	),
 
-	TP_printk("ring %p, user_data 0x%llx, result %ld, cflags %x",
+	TP_printk("ring %p, user_data 0x%llx, result %d, cflags %x",
 			  __entry->ctx, (unsigned long long)__entry->user_data,
 			  __entry->res, __entry->cflags)
 );