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

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Message-ID: <20150111105436.GA19421@pd.tnic>
Date:	Sun, 11 Jan 2015 11:54:36 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	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 Sun, Jan 11, 2015 at 04:33:58AM +0100, Denys Vlasenko wrote:
> I understand Andy's post.
> My question is, what about places like this?
> 
> > .macro op_safe_regs op
> > ENTRY(\op\()_safe_regs)
> >         CFI_STARTPROC
> >         pushl_cfi %ebx
> >         pushl_cfi %ebp
> >         pushl_cfi %esi
> >         pushl_cfi %edi
> 
> Do we need to convert it to use macros which also do
> "CFI_REL_OFFSET reg, 0" thingy, or not?
> In either case: why?

What is different at those places to not use the CFI annotations?

Frankly speaking, I'm for dropping all that CFI ugliness completely.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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