linux-kernel - Re: [Y2038] [PATCH 07/23] y2038: vdso: powerpc: avoid timespec references

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Message-ID: <4faa78cd0a86cf5d0aea9bb16d03145c5745450b.camel@codethink.co.uk>
Date:   Wed, 20 Nov 2019 22:43:13 +0000
From:   Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:     Arnd Bergmann <arnd@...db.de>, y2038@...ts.linaro.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     Christophe Leroy <christophe.leroy@....fr>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Nicholas Piggin <npiggin@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linuxppc-dev@...ts.ozlabs.org, Allison Randal <allison@...utok.net>
Subject: Re: [Y2038] [PATCH 07/23] y2038: vdso: powerpc: avoid timespec
 references

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@...al
>  	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".

>  
>  	cmplwi	r11,0			/* check if t is NULL */
>  	beq	2f
> @@ -268,7 +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+TSPEC_TV_SEC(r9)
> +	lwz	r5,STAMP_XTIME_SEC+LOWPART(r9)

Same here.

>  	lwz	r6,STAMP_SEC_FRAC(r9)
>  	addc	r4,r4,r6
>  	adde	r3,r3,r5
[...]

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom