linux-kernel - Re: [PATCH] x86: introduce push/pop macros which generate CFI_REL_OFFSET and CFI

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Message-ID: <CALCETrVozupixR2cQQnS_aS4DvdZdfijjKE4G9dqvHoHpn=1oQ@mail.gmail.com>
Date:	Wed, 11 Feb 2015 12:24:00 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	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] x86: introduce push/pop macros which generate
 CFI_REL_OFFSET and CFI_RESTORE

On Sun, Jan 11, 2015 at 3:07 PM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
> Sequences
>         pushl_cfi %reg
>         CFI_REL_OFFSET reg, 0
> and
>         popl_cfi %reg
>         CFI_RESTORE reg
> happen quite often. This patch adds macros which generate them.
>
> No assembly changes (verified with objdump -dr vmlinux.o).

Applied as-is.  I'm sure that there's an even better way to do this,
but I think that this patch is a clear improvement.

--Andy
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