linux-kernel - Re: [PATCH v4 1/3] tracing: Add array printing helpers

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Message-ID: <20150128073804.12bc56a5@gandalf.local.home>
Date:	Wed, 28 Jan 2015 07:38:04 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Javi Merino <javi.merino@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Dave P Martin <Dave.Martin@....com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v4 1/3] tracing: Add array printing helpers

On Wed, 28 Jan 2015 12:24:03 +0000
Javi Merino <javi.merino@....com> wrote:

> > > el_size should not be based on bits, it should be based on bytes. I
> > > passed in "sizeof()" which doesn't work with bits.
> 
> Ugh.  If you use sizeof() in print_array() then trace-cmd won't be
> able to parse it since it doesn't have an implementation of sizeof().
> 
>   [thermal_power_allocator:thermal_power_allocator] function sizeof not defined
>   Error: expected type 5 but read 0
> *** Error in `./trace-cmd': double free or corruption (fasttop): 0x0000000000e04980 ***
> 
> Implementing a fully functional sizeof() in trace-cmd will be a huge
> beast, I guess you will have to limit it to only some types.

Well it shouldn't crash, because people will be using things like
sizeof(). Just default it to 4 or 8 (word length).

We can work on a sizeof routine later. I have ideas on how to do it. Or
at least make it work for the common cases.

-- Steve

> 
> > > Please update to "el_size < 1 || el_size > 8".
> > > 
> > > and adjust the rest accordingly.
> > 
> > Done, I'm testing it now.  I'll send a v5 later today.
> > 
> > Cheers,
> > Javi

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