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From: Arnd Bergmann <arnd@arndb.de>
To: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: y2038 Mailman List <y2038@lists.linaro.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	Paul Mackerras <paulus@samba.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.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: Thu, 21 Nov 2019 15:23:57 +0100
Message-ID: <CAK8P3a1nRq98ngfKnR2Du+7_vOxSRFD9AyjHyUCsAtk_gLR_Uw@mail.gmail.com> (raw)
In-Reply-To: <4faa78cd0a86cf5d0aea9bb16d03145c5745450b.camel@codethink.co.uk>

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:
> [...]
> > --- a/arch/powerpc/kernel/vdso32/gettimeofday.S
> > +++ b/arch/powerpc/kernel/vdso32/gettimeofday.S
> > @@ -15,10 +15,8 @@
> >  /* Offset for the low 32-bit part of a field of long type */
> >  #if defined(CONFIG_PPC64) && defined(CONFIG_CPU_BIG_ENDIAN)
> >  #define LOPART       4
> > -#define TSPEC_TV_SEC TSPC64_TV_SEC+LOPART
> >  #else
> >  #define LOPART       0
> > -#define TSPEC_TV_SEC TSPC32_TV_SEC
> >  #endif
> >
> >       .text
> > @@ -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.

I'm surprised that the 0-day bot did not report this already.

Thanks fro the careful review!

        Arnd

commit 1c11ca7a0584ddede5b8c93057b40d31e8a96d3d (HEAD)
Author: Arnd Bergmann <arnd@arndb.de>
Date:   Thu Nov 21 15:19:49 2019 +0100

    y2038: fix typo in powerpc vdso "LOPART"

    The earlier patch introduced a typo, change LOWPART back to
    LOPART.

    Fixes: 176ed98c8a76 ("y2038: vdso: powerpc: avoid timespec references")
    Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
    Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S
b/arch/powerpc/kernel/vdso32/gettimeofday.S
index a7180b0f4aa1..c8e6902cb01b 100644
--- a/arch/powerpc/kernel/vdso32/gettimeofday.S
+++ b/arch/powerpc/kernel/vdso32/gettimeofday.S
@@ -190,7 +190,7 @@ V_FUNCTION_BEGIN(__kernel_time)
        bl      __get_datapage@local
        mr      r9, r3                  /* datapage ptr in r9 */

-       lwz     r3,STAMP_XTIME_SEC+LOWPART(r9)
+       lwz     r3,STAMP_XTIME_SEC+LOPART(r9)

        cmplwi  r11,0                   /* check if t is NULL */
        beq     2f
@@ -266,7 +266,7 @@ __do_get_tspec:
         * as a 32.32 fixed-point number in r3 and r4.
         * Load & add the xtime stamp.
         */
-       lwz     r5,STAMP_XTIME_SEC+LOWPART(r9)
+       lwz     r5,STAMP_XTIME_SEC+LOPART(r9)

        lwz     r6,STAMP_SEC_FRAC(r9)
        addc    r4,r4,r6
        adde    r3,r3,r5

  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 [this message]
2019-11-21 16:25       ` Christophe Leroy
2019-11-27 11:03         ` Arnd Bergmann
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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