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

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Date:   Wed, 12 Apr 2023 10:01:18 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     '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>
CC:     "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

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.

	David

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