linux-kernel - Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate

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Date:   Sat, 11 Feb 2023 22:03:11 -0500
From:   Alan Stern <stern@...land.harvard.edu>
To:     Kent Overstreet <kent.overstreet@...ux.dev>
Cc:     Kent Overstreet <kent.overstreet@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Coly Li <colyli@...e.de>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        syzkaller <syzkaller@...glegroups.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Boqun Feng <boqun.feng@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Hillf Danton <hdanton@...a.com>
Subject: Re: [PATCH RFC] drivers/core: Replace lockdep_set_novalidate_class()
 with unique class keys

On Sat, Feb 11, 2023 at 09:46:42PM -0500, Kent Overstreet wrote:
> On Sat, Feb 11, 2023 at 09:40:58PM -0500, Alan Stern wrote:
> > Or maybe you're referring to what this patch does?  It does indeed 
> > create a bunch of dynamic classes -- one for each struct device.  The 
> > ordering rules derived by lockdep will be somewhat arbitrary, as you 
> > say.  But some of them certainly will be related to the structure of the 
> > source code.
> 
> I could be :) I haven't been able to find the patch in question - have a
> link?

It was earlier in this email thread.  Here's a link:

https://lore.kernel.org/r/Y+gLd78vChQERZ6A@rowland.harvard.edu/

> If you're talking about making lock_class_key dynamic, I think I stand
> by what I said though - OTOH, if all you're doing is lifting that to the
> caller of the device object init function, so it'll still be a static
> object in the driver, that would be totally fine.

The patch does the first, not the second.  Feel free to object some 
more...  :-)

Alan Stern

> I probably should've found the patch before commenting :)