linux-kernel - Re: PATCH [0/3]: Simplify the kernel build by removing perl.

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Message-Id: <200901032105.00779.rob@landley.net>
Date:	Sat, 3 Jan 2009 21:05:00 -0600
From:	Rob Landley <rob@...dley.net>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Matthieu CASTET <matthieu.castet@...rot.com>,
	Arkadiusz Miskiewicz <a.miskiewicz@...il.com>,
	linux-kernel@...r.kernel.org,
	Embedded Linux mailing list <linux-embedded@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>, Sam Ravnborg <sam@...nborg.org>
Subject: Re: PATCH [0/3]: Simplify the kernel build by removing perl.

On Saturday 03 January 2009 18:44:58 Robert Hancock wrote:
> Rob Landley wrote:
> > For the record, the reason I can't just pregenerate all these suckers on
> > a system that's got an arbitrary precision calculator (ala dc) and then
> > just ship the resulting header files (more or less the what the first
> > version of that first patch did) is that some architectures (arm omap and
> > and arm at91) allow you to enter arbitrary HZ values in kconfig.  (Their
> > help text says that in many cases values that aren't powers of two won't
> > work, but nothing enforces this.)  So if we didn't have the capability to
> > dynamically generate these, you could enter a .config value that would
> > break the build.
>
> Is there a good reason that these archs allow you enter arbitrary HZ
> values?

Not that I've noticed, no.  But you should ask Thomas Gleixner about that 
about that, I'm not a domain expert...

> The use case for using custom HZ values at all nowadays seems
> fairly low now that dynticks is around (if that arch supports it
> anyway), let alone being able to specify wierd obscure values for it.

And high performance event timers.  A kernel can have more than one time 
source these days...

Rob
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