linux-kernel - Re: [PATCH v3] printk: add option to print cpu id

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Date:	Fri, 3 Aug 2012 14:59:54 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	"Pandita, Vikram" <vikram.pandita@...com>
Cc:	Aaro Koskinen <aaro.koskinen@....fi>,
	Andi Kleen <andi@...stfloor.org>, kay@...y.org,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Mike Turquette <mturquette@...aro.org>,
	Vimarsh Zutshi <vimarsh.zutshi@...il.com>
Subject: Re: [PATCH v3] printk: add option to print cpu id

On Fri, Aug 03, 2012 at 02:24:20PM -0700, Pandita, Vikram wrote:
> Aaro
> 
> On Fri, Aug 3, 2012 at 1:08 PM, Aaro Koskinen <aaro.koskinen@....fi> wrote:
> > Hi,
> >
> > On Fri, Aug 03, 2012 at 11:25:37AM -0700, Pandita, Vikram wrote:
> >> > And really: Wasting 1/3 of the 80 character line is too much.
> >>
> >> You _WASTE_ 4 chars only if you are interested in this info by
> >> enabling: CONFIG_PRINTK_CPUID
> >
> > I guess you waste 4 + 3 chars? You could optimize the length by checking
> > CONFIG_NR_CPUS?
> 
> Good point.
> Looks there is a variable 'nr_cpu_ids' that could be used as well.
> 
> If there is general consensus that the patch can help the arm
> community, and others in general,
> this optimization should be easy to implement - saving few chars space
> in each line of console output.
> 
> For now i will stick to this v3 version of path, unless you think otherwise.

I don't think is is something that anyone needs, and if you do, as
pointed out, you can use the trace function to make it happen.

Adding features are not "free", someone has to maintain them and all of
the other work involved with it.  So don't just think that because it is
hidden behind a config option, that it doesn't affect people.

greg k-h
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