linux-kernel - Re: Linux 4.19.98

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Date:   Thu, 23 Jan 2020 09:37:18 +0000
From:   Chris Wilson <chris@...is-wilson.co.uk>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        torvalds@...ux-foundation.org, lwn@....net,
        Jiri Slaby <jslaby@...e.cz>
Subject: Re: Linux 4.19.98

Quoting Greg KH (2020-01-23 09:28:32)
> On Thu, Jan 23, 2020 at 08:54:45AM +0000, Chris Wilson wrote:
> > Quoting Greg KH (2020-01-23 08:46:32)
> > > I'm announcing the release of the 4.19.98 kernel.
> > 
> > commit 3e6b472f474accf757e107919f8ee42e7315ac0d
> > Author: Waiman Long <longman@...hat.com>
> > Date:   Wed Nov 14 09:55:40 2018 -0800
> > 
> >     efi: Fix debugobjects warning on 'efi_rts_work'
> > 
> >     [ Upstream commit ef1491e791308317bb9851a0ad380c4a68b58d54 ]
> > 
> >     The following commit:
> > 
> >       9dbbedaa6171 ("efi: Make efi_rts_work accessible to efi page fault handler")
> > 
> >     converted 'efi_rts_work' from an auto variable to a global variable.
> >     However, when submitting the work, INIT_WORK_ONSTACK() was still used,
> >     causing the following complaint from debugobjects:
> > 
> >       ODEBUG: object 00000000ed27b500 is NOT on stack 00000000c7d38760, but annotated.
> > 
> >     Change the macro to just INIT_WORK() to eliminate the warning.
> > 
> >     Signed-off-by: Waiman Long <longman@...hat.com>
> >     Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> >     Acked-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@...el.com>
> >     Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> >     Cc: Peter Zijlstra <peterz@...radead.org>
> >     Cc: Thomas Gleixner <tglx@...utronix.de>
> >     Cc: linux-efi@...r.kernel.org
> >     Fixes: 9dbbedaa6171 ("efi: Make efi_rts_work accessible to efi page fault handler")
> >     Link: http://lkml.kernel.org/r/20181114175544.12860-2-ard.biesheuvel@linaro.org
> >     Signed-off-by: Ingo Molnar <mingo@...nel.org>
> >     Signed-off-by: Sasha Levin <sashal@...nel.org>
> > 
> > was incorrectly applied to v4.19.41 and causes lockdep complaints for
> > the onstack efi_rts_work being initialised by INIT_WORK().
> 
> Incorrectly how?  Fuzz off, or it shouldn't be applied at all?  Should
> this be reverted, or just fixed up, and if fixed up, do you have a patch
> to fix it?

Just reverted. It applies to 9dbbedaa6171 which moved the efi_rts_work
off the stack, but is not in v4.19.y, so efi_rts_work is still a local
and needs the INIT_WORK_ONSTACK annotation.
-Chris