Re: Fwd: [PATCH] Make sysenter support optional

[Matt Mackall]

On Wed, Dec 28, 2005 at 02:13:45PM -0800, Ulrich Drepper wrote:
> > This adds configurable sysenter support on x86. This saves about 5k on
> > small systems.
> 
> You not only remove the sysenter support but also the vdso.  And the
> later is a very bad idea.  It is already today basically impossible to
> have reliable backtraces without the vdso and the unwind info it
> contains for signal handlers.  And things can only get worse in future.
>  The magic heuristics in the compiler are not reliable.  It's simply the
> wrong face, this in a interface between the kernel and the libc, the
> compiler should not have such knowledge.
> 
> The vdso should be mandatory for all configurations.

It's under CONFIG_EMBEDDED. Think uclibc. Think systems without
interactive shells.

-- 
Mathematics is the supreme nostalgia of our time.
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