linux-kernel - Re: [PATCH 2/2] x86/asm/entry/64: Remove unused thread

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Message-ID: <20150317144133.GB18462@gmail.com>
Date:	Tue, 17 Mar 2015 15:41:33 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] x86/asm/entry/64: Remove unused thread_struct::usersp


* Denys Vlasenko <dvlasenk@...hat.com> 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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