linux-kernel - Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct pt

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Message-ID: <CAK1hOcOwD0cpVWZEV8FP40y9149feUdaxoszQC+wWQfAwU4MNQ@mail.gmail.com>
Date:	Mon, 4 Aug 2014 16:28:03 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH 4/5] x86: entry_64.S: always allocate complete "struct pt_regs"

On Fri, Aug 1, 2014 at 7:04 PM, Andy Lutomirski <luto@...capital.net> wrote:
> On Fri, Aug 1, 2014 at 7:48 AM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
>> 64-bit code was using six stack slots fewer by not saving/restoring
>> registers which a callee-preserved according to C ABI,
>> and not allocating space for them
>
> This is great.
>
> Next up: remove FIXUP/RESTORE_TOP_OF_STACK? :)  Maybe I'll give that a shot.

I'm yet at the stage "what that stuff does anyway?" and at
"why do we need percpu old_rsp thingy?" in particular.
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