Re: [PATCH 2/2] x86/asm/entry/64: Remove unused thread_struct::usersp

[Ingo Molnar]

* Denys Vlasenko <dvlasenk@xxxxxxxxxx> wrote:

> All manipulations of PER_CPU(old_rsp) in C code are removed:
> it is not used on SYSRET return, so storing anything there is
> pointless.
> 
> This also allows us to get rid of thread_struct::usersp,
> which was needed only to set PER_CPU(old_rsp) for correct
> return from fork/clone.
> 
> Tweak a few comments as well: we no longer have "partial stack frame",
> ever.

So this doesn't really explain it very well, plus it still 
unnecessarily mixes up two changes in a single patch: please
don't do that!

I've fixed it all up and split up the patch into two, easier
to bisect parts.

Thanks,

	Ingo
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