linux-kernel - Re: [RFC/HACK] x86: Fast return to kernel

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Message-ID: <CA+55aFzQiryYPsUTK-yS_rt=MGtzJZBBrj3waGq6Ez3GUqfMnw@mail.gmail.com>
Date:	Fri, 2 May 2014 14:07:13 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	"H. Peter Anvin" <h.peter.anvin@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC/HACK] x86: Fast return to kernel

On Fri, May 2, 2014 at 2:04 PM, Andy Lutomirski <luto@...capital.net> wrote:
>
> Because otherwise I'd have to keep track of whether it's a zeroentry
> or an errorentry.  I can't stuff the offset in a register without even
> more stack hackery, since there are no available registers there.  I
> could split the whole thing into two code paths, I guess.

Ahh. Never mind. I didn't think about the fact that the error entry
case had one more field on the stack. Your approach is all fine, it
was me not seeing the problem.

          Linus
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