linux-kernel - Re: [PATCH] wait_on_bit: add an acquire memory barrier

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Message-ID: <20220826174352.GA20386@willie-the-truck>
Date:   Fri, 26 Aug 2022 18:43:53 +0100
From:   Will Deacon <will@...nel.org>
To:     Mikulas Patocka <mpatocka@...hat.com>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Andrea Parri <parri.andrea@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Akira Yokosawa <akiyks@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH] wait_on_bit: add an acquire memory barrier

On Fri, Aug 26, 2022 at 10:08:42AM -0400, Mikulas Patocka wrote:
> On Fri, 26 Aug 2022, Mikulas Patocka wrote:
> > On Fri, 26 Aug 2022, Will Deacon wrote:
> > > On Thu, Aug 25, 2022 at 05:03:40PM -0400, Mikulas Patocka wrote:
> > > > For me, the kernel 6.0-rc2 doesn't boot in an arm64 virtual machine at all 
> > > > (with or without this patch), so I only compile-tested it on arm64. I have 
> > > > to bisect it.
> > > 
> > > It's working fine for me and I haven't had any other reports that it's not
> > > booting. Please could you share some more details about your setup so we
> > > can try to reproduce the problem?
> > 
> > I'm bisecting it now. I'll post the offending commit when I'm done.
> 
> So, the bad commit is aacd149b62382c63911060b8f64c1e3d89bd405a ("arm64: 
> head: avoid relocating the kernel twice for KASLR").

Thanks. Any chance you could give this a go, please?

https://lore.kernel.org/r/20220826164800.2059148-1-ardb@kernel.org

Will