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From: Ben Hutchings <ben.hutchings@codethink.co.uk>
To: Arnd Bergmann <arnd@arndb.de>,
	y2038@lists.linaro.org,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	Paul Mackerras <paulus@samba.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [Y2038] [PATCH 3/8] powerpc: fix vdso32 for ppc64le
Date: Wed, 20 Nov 2019 19:13:12 +0000	[thread overview]
Message-ID: <fdcb510863c801f1f64448e558ee0f8ed20db418.camel@codethink.co.uk> (raw)
In-Reply-To: <20191108203435.112759-4-arnd@arndb.de>

On Fri, 2019-11-08 at 21:34 +0100, Arnd Bergmann wrote:
> On little-endian 32-bit application running on 64-bit kernels,
> the current vdso would read the wrong half of the xtime seconds
> field. Change it to return the lower half like it does on
> big-endian.

ppc64le doesn't have 32-bit compat so this is only theoretical.

Ben.

> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  arch/powerpc/kernel/vdso32/gettimeofday.S | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/vdso32/gettimeofday.S b/arch/powerpc/kernel/vdso32/gettimeofday.S
> index becd9f8767ed..4327665ad86f 100644
> --- a/arch/powerpc/kernel/vdso32/gettimeofday.S
> +++ b/arch/powerpc/kernel/vdso32/gettimeofday.S
> @@ -13,7 +13,7 @@
>  #include <asm/unistd.h>
>  
>  /* Offset for the low 32-bit part of a field of long type */
> -#ifdef CONFIG_PPC64
> +#if defined(CONFIG_PPC64) && defined(CONFIG_CPU_BIG_ENDIAN)
>  #define LOPART	4
>  #define TSPEC_TV_SEC	TSPC64_TV_SEC+LOPART
>  #else
-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom


  reply	other threads:[~2019-11-20 19:13 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 20:34 [PATCH 0/8] y2038: bug fixes from y2038 work Arnd Bergmann
2019-11-08 20:34 ` [PATCH 1/8] y2038: timex: remove incorrect time_t truncation Arnd Bergmann
2019-11-10 20:44   ` Deepa Dinamani
2019-11-12  7:16   ` [tip: timers/urgent] ntp/y2038: Remove " tip-bot2 for Arnd Bergmann
2019-11-08 20:34 ` [PATCH 2/8] timekeeping: optimize ns_to_timespec64 Arnd Bergmann
2019-11-10 20:46   ` Deepa Dinamani
2019-11-12  7:22   ` [tip: timers/core] time: Optimize ns_to_timespec64() tip-bot2 for Arnd Bergmann
2019-11-08 20:34 ` [PATCH 3/8] powerpc: fix vdso32 for ppc64le Arnd Bergmann
2019-11-20 19:13   ` Ben Hutchings [this message]
2019-11-20 19:35     ` [Y2038] " Arnd Bergmann
2019-11-20 21:49       ` Ben Hutchings
2019-11-21 10:02         ` Arnd Bergmann
2019-11-21 15:56           ` Ben Hutchings
2019-11-08 20:34 ` [PATCH 4/8] ipmi: kill off 'timespec' usage again Arnd Bergmann
2019-11-08 22:11   ` Corey Minyard
2019-11-09 11:23     ` Arnd Bergmann
2019-11-08 20:34 ` [PATCH 5/8] netfilter: xt_time: use time64_t Arnd Bergmann
2019-11-15 22:43   ` Pablo Neira Ayuso
2019-11-08 20:34 ` [PATCH 6/8] lp: fix sparc64 LPSETTIMEOUT ioctl Arnd Bergmann
2019-11-20 19:27   ` [Y2038] " Ben Hutchings
2019-11-20 19:46     ` Arnd Bergmann
2019-11-20 22:10       ` Ben Hutchings
2019-11-21 14:04         ` Arnd Bergmann
2019-11-21 16:00           ` Ben Hutchings
2019-11-08 20:34 ` [PATCH 7/8] ppdev: fix PPGETTIME/PPSETTIME ioctls Arnd Bergmann
2019-11-20 19:29   ` [Y2038] " Ben Hutchings
2019-11-21 14:06     ` Arnd Bergmann
2019-11-08 20:34 ` [PATCH 8/8] Input: input_event: fix struct padding on sparc64 Arnd Bergmann
2019-11-11 18:28   ` Dmitry Torokhov
2019-11-11 19:18     ` Arnd Bergmann

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