From: Florian Weimer <fweimer@redhat.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Jiri Slaby <jslaby@suse.cz>, Michael Ellerman <mpe@ellerman.id.au>
Subject: Re: Kernel 4.15 lost set_robust_list support on POWER 9
Date: Mon, 5 Feb 2018 13:59:19 +0100 [thread overview]
Message-ID: <75d2a8f1-6ca4-e9ca-9900-9fbd48f3c1ae@redhat.com> (raw)
In-Reply-To: <3ef0c599-0285-e77a-c002-e21152823fb8@redhat.com>
On 02/05/2018 01:48 PM, Florian Weimer wrote:
> I get this:
>
> 7041 set_robust_list(0x7fff93dc3980, 24) = -1 ENOSYS (Function not
> implemented)
>
> The system call works on 4.14. Looks like the probing for
> futex_cmpxchg_enabled goes wrong.
>
> Sorry, I have no idea where to start digging. I don't see anything
> obvious in dmesg.
>
> I'm trying to revert
>
> commit 30d6e0a4190d37740e9447e4e4815f06992dd8c3
> Author: Jiri Slaby <jslaby@suse.cz>
> Date: Thu Aug 24 09:31:05 2017 +0200
>
> futex: Remove duplicated code and fix undefined behaviour
>
> to see if it makes a difference
Never mind, it must be something else because that commit is in 4.14,
but set_robust_list is still working there. (Let's hope that the
probing doesn't fail randomly …)
Thanks,
Florian
next prev parent reply other threads:[~2018-02-05 12:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-05 12:48 Kernel 4.15 lost set_robust_list support on POWER 9 Florian Weimer
2018-02-05 12:59 ` Florian Weimer [this message]
2018-02-05 21:14 ` Mauricio Faria de Oliveira
2018-02-05 21:55 ` Benjamin Herrenschmidt
2018-02-06 1:06 ` Nicholas Piggin
2018-02-06 3:17 ` Aneesh Kumar K.V
2018-02-06 4:29 ` Nicholas Piggin
2018-02-06 13:17 ` Mauricio Faria de Oliveira
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