linux-kernel - Re: Userspace visible of 3 include/asm/ headers

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Message-ID: <20060803194410.GC16927@redhat.com>
Date:	Thu, 3 Aug 2006 15:44:10 -0400
From:	Dave Jones <davej@...hat.com>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	linux-kernel@...r.kernel.org,
	David Woodhouse <dwmw2@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: Userspace visible of 3 include/asm/ headers

On Thu, Aug 03, 2006 at 09:39:52PM +0200, Adrian Bunk wrote:
 > Could anyone help me regarding the desired userspace visibility of the 
 > following three headers under include/asm/?
 > 
 > 
 > Header        : cpufeature.h
 > Architectures : i386, x86_64
 > Is there any reason why this header is exported to userspace?

Probably not. The only apps I've seen that care about feature bits
define them theirselves rather than use these.

 > Header        : setup.h
 > Architectures : i386, ia64, x86_64
 > Contents:
 > - COMMAND_LINE_SIZE on ia64, x86_64
 > - much more on i386
 > Should COMMAND_LINE_SIZE be visible to userspace?

Bootloaders probably need to know this.

 > Header        : timex.h
 > Architectures : all architectures
 > Offers CLOCK_TICK_RATE on all architectures, but on some architectures
 > (like i386) this depends on the kernel configuration.
 > -> not a userspace header?

Also longer term,  CLOCK_TICK_RATE will make no sense should we go
to a tickless kernel.

		Dave

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