linux-kernel - Re: [PATCH 00/18] Pile o' entry/exit/sp0 changes

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Date:   Thu, 26 Oct 2017 17:55:02 +0200 (CEST)
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Andy Lutomirski <luto@...nel.org>
cc:     X86 ML <x86@...nel.org>, Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>
Subject: Re: [PATCH 00/18] Pile o' entry/exit/sp0 changes

On Thu, 26 Oct 2017, Andy Lutomirski wrote:
> 
> Here's the first "real" version of this series.  It's based on Linus'
> tree from a couple days ago.

Not seeing any problems in this series. I was hoping it would remove more 
lines of code than it adds, and it's the reverse, but that seems to be 
mostly the new push/pop stuff. I'm taking it we couldn't just replace the 
'mov' instructions in the save/restore macros..

I *do* ask that when we have code like this:

        POP_EXTRA_REGS
        POP_C_REGS
        addq    $8, %rsp

that "addq $8" would have a comment about what stack entry we're skipping.

I *think* it's 'orig_eax', but wouldn't it be nice to say so?

            Linus