linux-kernel - Re: [PATCH 3/4] x86: open-code register save/restore in trace

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Date:	Sat, 10 Jan 2015 14:07:24 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>,
	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 3/4] x86: open-code register save/restore in
 trace_hardirqs thunks

On Sat, Jan 10, 2015 at 2:00 PM, Denys Vlasenko <dvlasenk@...hat.com> wrote:
> +       pushq_cfi %rdi
> +       CFI_REL_OFFSET rdi, 0
> +       pushq_cfi %rsi
> +       CFI_REL_OFFSET rsi, 0
> +       pushq_cfi %rdx
> +       CFI_REL_OFFSET rdx, 0
..
Ugh.

This is too ugly, it needs to die.

Why doesn't pushq_cfi do that CFI_REL_OFFSET thing?

And if there is some good reason why, then please let's just make sure
that there is a sane way to write pushes and pops, without having that
insane CFI crap for every single damn case.

Because this is unreadable.

                       Linus
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