Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys

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To: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Mon, 13 Feb 2023 10:27:18 +0100
Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx>, Kent Overstreet <kent.overstreet@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Coly Li <colyli@xxxxxxx>, Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>, syzkaller <syzkaller@xxxxxxxxxxxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, "Rafael J. Wysocki" <rafael@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Boqun Feng <boqun.feng@xxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, USB list <linux-usb@xxxxxxxxxxxxxxx>, Hillf Danton <hdanton@xxxxxxxx>
In-reply-to: <Y+lJxCLpwMGuq0sP@rowland.harvard.edu>
References: <CAHk-=whXYzkOJZo0xpyYfrhWQg1M7j0OeCojTJ84CN4q9sqb2Q@mail.gmail.com> <109c3cc0-2c13-7452-4548-d0155c1aba10@gmail.com> <Y+gjuqJ5RFxwLmht@moria.home.lan> <Y+hRurRwm//1+IcK@rowland.harvard.edu> <Y+hTEtCKPuO0zGIt@moria.home.lan> <Y+hW74TAVzCpSv7c@rowland.harvard.edu> <Y+hYn6uzIUBaxDdV@moria.home.lan> <Y+kEgDLSRwdODRdD@rowland.harvard.edu> <Y+k6ehYLWa0cmbvb@moria.home.lan> <Y+lJxCLpwMGuq0sP@rowland.harvard.edu>

On Sun, Feb 12, 2023 at 03:19:16PM -0500, Alan Stern wrote:

> (Device names are often set after the device is initialized.  Does 
> lockdep mind if a lock_class_key's name is changed after it has been 
> registered?)

It does, althought I don't at the moment recall how hard it would be to
change that.

Follow-Ups:
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Alan Stern

References:
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Linus Torvalds
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Kent Overstreet
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Kent Overstreet
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Alan Stern
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Kent Overstreet
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Alan Stern
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Kent Overstreet
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Alan Stern
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Kent Overstreet
- Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class() with unique class keys
  - From: Alan Stern

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