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From: Arnd Bergmann <arnd@arndb.de>
To: Christophe Leroy <christophe.leroy@c-s.fr>
Cc: Ben Hutchings <ben.hutchings@codethink.co.uk>,
	y2038 Mailman List <y2038@lists.linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	Paul Mackerras <paulus@samba.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	Allison Randal <allison@lohutok.net>
Subject: Re: [Y2038] [PATCH 07/23] y2038: vdso: powerpc: avoid timespec references
Date: Wed, 27 Nov 2019 12:03:10 +0100
Message-ID: <CAK8P3a1UmAYTx=Vv06xP=O-oYD8_HzNqMG0-p7GPP2xgzs+75w@mail.gmail.com> (raw)
In-Reply-To: <20191121172529.Horde.0uDMS4xQ-xexjp4a2mIoXQ5@messagerie.si.c-s.fr>

On Thu, Nov 21, 2019 at 5:25 PM Christophe Leroy
<christophe.leroy@c-s.fr> wrote:
> Arnd Bergmann <arnd@arndb.de> a écrit :
> > On Wed, Nov 20, 2019 at 11:43 PM Ben Hutchings
> > <ben.hutchings@codethink.co.uk> wrote:
> >>
> >> On Fri, 2019-11-08 at 22:07 +0100, Arnd Bergmann wrote:
> >> > @@ -192,7 +190,7 @@ V_FUNCTION_BEGIN(__kernel_time)
> >> >       bl      __get_datapage@local
> >> >       mr      r9, r3                  /* datapage ptr in r9 */
> >> >
> >> > -     lwz     r3,STAMP_XTIME+TSPEC_TV_SEC(r9)
> >> > +     lwz     r3,STAMP_XTIME_SEC+LOWPART(r9)
> >>
> >> "LOWPART" should be "LOPART".
> >>
> >
> > Thanks, fixed both instances in a patch on top now. I considered folding
> > it into the original patch, but as it's close to the merge window I'd
> > rather not rebase it, and this way I also give you credit for
> > finding the bug.
>
> Take care, might conflict with
> https://github.com/linuxppc/linux/commit/5e381d727fe8834ca5a126f510194a7a4ac6dd3a

Sorry for my late reply. I see this commit and no other variant of it has
made it into linux-next by now, so I assume this is not getting sent for v5.5
and it's not stopping me from sending my own pull request.

Please let me know if I missed something and this will cause problems.

On a related note: are you still working on the generic lib/vdso support for
powerpc? Without that, future libc implementations that use 64-bit time_t
will have to use the slow clock_gettime64 syscall instead of the vdso,
which has a significant performance impact.

       Arnd

  reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 21:02 [PATCH 00/23] y2038 cleanups Arnd Bergmann
2019-11-08 21:07 ` [PATCH 03/23] y2038: vdso: change timeval to __kernel_old_timeval Arnd Bergmann
2019-11-13 21:56   ` Thomas Gleixner
2019-11-08 21:07 ` [PATCH 07/23] y2038: vdso: powerpc: avoid timespec references Arnd Bergmann
2019-11-20 22:43   ` [Y2038] " Ben Hutchings
2019-11-21 14:23     ` Arnd Bergmann
2019-11-21 16:25       ` Christophe Leroy
2019-11-27 11:03         ` Arnd Bergmann [this message]
2019-12-02 12:55           ` Christophe Leroy
2019-12-02 14:03             ` Arnd Bergmann
2019-11-08 21:07 ` [PATCH 08/23] y2038: ipc: remove __kernel_time_t reference from headers Arnd Bergmann
2019-11-20 22:49   ` [Y2038] " Ben Hutchings
2019-11-21 14:28     ` Arnd Bergmann
2019-11-08 21:07 ` [PATCH 09/23] y2038: stat: avoid 'time_t' in 'struct stat' Arnd Bergmann
2019-11-08 21:12 ` [PATCH 12/23] y2038: syscalls: change remaining timeval to __kernel_old_timeval Arnd Bergmann
2019-11-11 12:44   ` Christian Brauner
2019-11-13 22:39   ` Rafael J. Wysocki
2019-11-13 21:40 ` [PATCH 00/23] y2038 cleanups Arnd Bergmann

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