linux-kernel - Re: [PATCH 1/2] x86: profiling: remove lock functions hack for !FRAME

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Date:   Wed, 19 Apr 2023 09:17:13 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     'Chen Zhongjin' <chenzhongjin@...wei.com>,
        Dave Hansen <dave.hansen@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "akpm@...ux-foudation.org" <akpm@...ux-foudation.org>,
        "ben-linux@...ff.org" <ben-linux@...ff.org>,
        "wuchi.zero@...il.com" <wuchi.zero@...il.com>
Subject: Re: [PATCH 1/2] x86: profiling: remove lock functions hack for
 !FRAME_POINTER

On Wed, Apr 12, 2023 at 10:01:18AM +0000, David Laight wrote:
> From: Chen Zhongjin
> > Sent: 12 April 2023 08:02
> ...
> > > 4. !CONFIG_FRAME_POINTER is probably even more rare today than it was in
> > >     2006
> >
> > No. !CONFIG_FRAME_POINTER is more common today because of UNWINDER_ORC.
> > And that is why the bug is triggered more frequently.
> 
> CONFIG_FRAME_POINTER is pretty much required (on x86-64)
> for the user copy checks that are enabled in distro kernels.

CONFIG_FRAME_POINTER is pretty much deprecated.  The only distro still
using it (that I know of) is Ubuntu.

-- 
Josh