linux-kernel - Re: [PATCH -next] jbd2: use the correct print format

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Date:   Mon, 21 Mar 2022 10:25:03 +0100
From:   Jan Kara <jack@...e.cz>
To:     Bixuan Cui <cuibixuan@...ux.alibaba.com>
Cc:     linux-kernel@...r.kernel.org, rostedt@...dmis.org,
        mingo@...hat.com, yi.zhang@...wei.com, jack@...e.cz
Subject: Re: [PATCH -next] jbd2: use the correct print format

On Fri 18-03-22 23:56:40, Bixuan Cui wrote:
> The print format error was found when using ftrace event:
>     <...>-1406 [000] .... 23599442.895823: jbd2_end_commit: dev 252,8 transaction -1866216965 sync 0 head -1866217368
>     <...>-1406 [000] .... 23599442.896299: jbd2_start_commit: dev 252,8 transaction -1866216964 sync 0
> 
> Print transaction and head with the unsigned format "%u" instead.
> 
> Fixes: 879c5e6b7cb4 ('jbd2: convert instrumentation from markers to tracepoints')
> Signed-off-by: Bixuan Cui <cuibixuan@...ux.alibaba.com>

Makes sense. Thanks for the fix. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  include/trace/events/jbd2.h | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/trace/events/jbd2.h b/include/trace/events/jbd2.h
> index a4dfe005983d..5be1aa1691fb 100644
> --- a/include/trace/events/jbd2.h
> +++ b/include/trace/events/jbd2.h
> @@ -40,7 +40,7 @@ DECLARE_EVENT_CLASS(jbd2_commit,
>  	TP_STRUCT__entry(
>  		__field(	dev_t,	dev			)
>  		__field(	char,	sync_commit		  )
> -		__field(	int,	transaction		  )
> +		__field(	tid_t,	transaction		  )
>  	),
>  
>  	TP_fast_assign(
> @@ -49,7 +49,7 @@ DECLARE_EVENT_CLASS(jbd2_commit,
>  		__entry->transaction	= commit_transaction->t_tid;
>  	),
>  
> -	TP_printk("dev %d,%d transaction %d sync %d",
> +	TP_printk("dev %d,%d transaction %u sync %d",
>  		  MAJOR(__entry->dev), MINOR(__entry->dev),
>  		  __entry->transaction, __entry->sync_commit)
>  );
> @@ -97,8 +97,8 @@ TRACE_EVENT(jbd2_end_commit,
>  	TP_STRUCT__entry(
>  		__field(	dev_t,	dev			)
>  		__field(	char,	sync_commit		  )
> -		__field(	int,	transaction		  )
> -		__field(	int,	head		  	  )
> +		__field(	tid_t,	transaction		  )
> +		__field(	tid_t,	head		  	  )
>  	),
>  
>  	TP_fast_assign(
> @@ -108,7 +108,7 @@ TRACE_EVENT(jbd2_end_commit,
>  		__entry->head		= journal->j_tail_sequence;
>  	),
>  
> -	TP_printk("dev %d,%d transaction %d sync %d head %d",
> +	TP_printk("dev %d,%d transaction %u sync %d head %u",
>  		  MAJOR(__entry->dev), MINOR(__entry->dev),
>  		  __entry->transaction, __entry->sync_commit, __entry->head)
>  );
> -- 
> 2.19.1.6.gb485710b
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR