linux-kernel - Re: [PATCH V3 7/9] tracing: Add __print_ns_to_secs() and __print_ns_without

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Message-ID: <20210603172902.41648183@gandalf.local.home>
Date:   Thu, 3 Jun 2021 17:29:02 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Daniel Bristot de Oliveira <bristot@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Phil Auld <pauld@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Kate Carcia <kcarcia@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Clark Willaims <williams@...hat.com>,
        John Kacur <jkacur@...hat.com>,
        Juri Lelli <juri.lelli@...hat.com>, linux-doc@...r.kernel.org
Subject: Re: [PATCH V3 7/9] tracing: Add __print_ns_to_secs() and
 __print_ns_without_secs() helpers

On Fri, 14 May 2021 22:51:16 +0200
Daniel Bristot de Oliveira <bristot@...hat.com> wrote:

> +++ b/include/trace/trace_events.h
> @@ -358,6 +358,21 @@ TRACE_MAKE_SYSTEM_STR();
>  	trace_print_hex_dump_seq(p, prefix_str, prefix_type,		\
>  				 rowsize, groupsize, buf, len, ascii)
>  
> +#undef __print_ns_to_secs
> +#define __print_ns_to_secs(value)			\
> +	({						\
> +		u64 ____val = (u64)value;		\
> +		do_div(____val, NSEC_PER_SEC);		\
> +		____val;				\
> +	})

I know my name is on this, but we need parenthesis around "value".

> +
> +#undef __print_ns_without_secs
> +#define __print_ns_without_secs(value)			\
> +	({						\
> +		u64 ____val = (u64)value;		\

Here too.

> +		(u32) do_div(____val, NSEC_PER_SEC);	\
> +	})
> +
>  #undef DECLARE_EVENT_CLASS
>  #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print)	\
>  static notrace enum print_line_t					\
> @@ -736,6 +751,16 @@ static inline void ftrace_test_probe_##call(void)			\
>  #undef __print_array
>  #undef __print_hex_dump
>  
> +/*
> + * The below is not executed in the kernel. It is only what is
> + * displayed in the print format for userspace to parse.
> + */
> +#undef __print_ns_to_secs
> +#define __print_ns_to_secs(val) val / 1000000000UL
> +
> +#undef __print_ns_without_secs
> +#define __print_ns_without_secs(val) val % 1000000000UL

And around "val" in the above two macros.

-- Steve

> +
>  #undef TP_printk
>  #define TP_printk(fmt, args...) "\"" fmt "\", "  __stringify(args)
>