linux-kernel - Re: [PATCH] tools lib traceevents: Fix output of %llu for 64 bit values read on 32 bit machines

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Message-ID: <20151116172302.0a9326b5@gandalf.local.home>
Date:	Mon, 16 Nov 2015 17:23:02 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] tools lib traceevents: Fix output of %llu for 64 bit
 values read on 32 bit machines

On Mon, 16 Nov 2015 15:33:10 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> When a long value is read on 32 bit machines for 64 bit output, the parsing
> needs to change "%lu" into "%llu", as the value is read natively.
> 
> Unfortunately, if "%llu" is already there, the code will add another "l" to
> it and fail to parse it properly.
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  tools/lib/traceevent/event-parse.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index 4d885934b919..43e202bb3ae3 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -4895,7 +4895,7 @@ static void pretty_print(struct trace_seq *s, void *data, int size, struct event
>  						break;
>  					}
>  				}
> -				if (pevent->long_size == 8 && ls &&
> +				if (pevent->long_size == 8 && ls == 1 &&

Bah, this breaks %p when reading on 32bit.

Update patch coming

-- Steve

>  				    sizeof(long) != 8) {
>  					char *p;
>  

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