linux-kernel - Re: [PATCH 02/12] trace: Make trace

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Message-ID: <20170407213011.36e29f42@gandalf.local.home>
Date:   Fri, 7 Apr 2017 21:30:11 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Deepa Dinamani <deepa.kernel@...il.com>
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        tglx@...utronix.de, viro@...iv.linux.org.uk,
        gregkh@...uxfoundation.org, andreas.dilger@...el.com,
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        davem@...emloft.net, dsterba@...e.com, dushistov@...l.ru,
        eparis@...hat.com, jaegeuk@...nel.org, jbacik@...com,
        jlayton@...chiereds.net, john.stultz@...aro.org,
        jsimmons@...radead.org, mingo@...hat.com, oleg.drokin@...el.com,
        paul@...l-moore.com, yuchao0@...wei.com,
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        lustre-devel@...ts.lustre.org, netdev@...r.kernel.org,
        samba-technical@...ts.samba.org, y2038@...ts.linaro.org
Subject: Re: [PATCH 02/12] trace: Make trace_hwlat timestamp y2038 safe

On Fri,  7 Apr 2017 17:57:00 -0700
Deepa Dinamani <deepa.kernel@...il.com> wrote:

> struct timespec is not y2038 safe on 32 bit machines
> and needs to be replaced by struct timespec64
> in order to represent times beyond year 2038 on such
> machines.
> 
> Fix all the timestamp representation in struct trace_hwlat
> and all the corresponding implementations.
> 

> diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
> index 02a4aeb..08f9bab 100644
> --- a/kernel/trace/trace_output.c
> +++ b/kernel/trace/trace_output.c
> @@ -4,7 +4,6 @@
>   * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@...hat.com>
>   *
>   */
> -
>  #include <linux/module.h>
>  #include <linux/mutex.h>
>  #include <linux/ftrace.h>
> @@ -1161,11 +1160,11 @@ trace_hwlat_print(struct trace_iterator *iter, int flags,
>  
>  	trace_assign_type(field, entry);
>  
> -	trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%ld.%09ld",
> +	trace_seq_printf(s, "#%-5u inner/outer(us): %4llu/%-5llu ts:%lld.%09ld",
>  			 field->seqnum,
>  			 field->duration,
>  			 field->outer_duration,
> -			 field->timestamp.tv_sec,
> +			 (long long)field->timestamp.tv_sec,

Refresh my memory. We need the cast because on 64 bit boxes
timestamp.tv_sec is just a long?

Other than that.

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

>  			 field->timestamp.tv_nsec);
>  
>  	if (field->nmi_count) {
> @@ -1195,10 +1194,10 @@ trace_hwlat_raw(struct trace_iterator *iter, int flags,
>  
>  	trace_assign_type(field, iter->ent);
>  
> -	trace_seq_printf(s, "%llu %lld %ld %09ld %u\n",
> +	trace_seq_printf(s, "%llu %lld %lld %09ld %u\n",
>  			 field->duration,
>  			 field->outer_duration,
> -			 field->timestamp.tv_sec,
> +			 (long long)field->timestamp.tv_sec,
>  			 field->timestamp.tv_nsec,
>  			 field->seqnum);
>