Re: Userspace visible of 3 include/asm/ headers

Dave Jones
2006-08-03T20:18:26Z

On Fri, Aug 04, 2006 at 12:14:02AM +0400, Alexey Dobriyan wrote:
> On Thu, Aug 03, 2006 at 03:44:10PM -0400, Dave Jones wrote:
> > 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.
>
> Feature bits are only (indirectly) visible via /proc/cpuinfo.
> struct cpuinfo_x86, AFAICS, is never copied to userspace. So, it's safe
> to remove this header.

Most of the bits (all but the linux specific ones), are the same bits you
can get from /dev/cpu/0/cpuid, or from calling the cpuid instruction by hand.

Dave

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